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datasheet AXP209 enhanced single cell li - battery and power system management ic x - powers ? 2010 x - powers limited - all rights reserved
AXP209 enhanced single cell li - battery and power system manage ment ic table of contents 1. overview ................................ ................................ ................................ ................................ ........ 3 2. feature s ................................ ................................ ................................ ................................ ......... 4 3. typical a pplication ................................ ................................ ................................ ........................ 5 4. absolute maximum ratings ................................ ................................ ................................ ......... 6 5. electrical characteristics ................................ ................................ ................................ ................ 6 6. typical charac teristics ................................ ................................ ................................ ................... 9 7. pin definition ................................ ................................ ................................ ............................... 12 8. functional block diagram ................................ ................................ ................................ ........... 14 9. control and operation ................................ ................................ ................................ ................ 15 9.1 power on / off & rese t ................................ ................................ ................................ ..... 15 9.2 power path ma nagement ( ips) ................................ ................................ .......................... 17 9.3 adaptive pwm charger ................................ ................................ ................................ ..... 19 9.4 backup battery ................................ ................................ ................................ ................... 22 9.5 multi - channel power output s ................................ ................................ ............................ 23 9.6 default voltage / timing setting s ................................ ................................ ..................... 24 9.7 si gnal acquisition system ................................ ................................ ................................ . 25 9.8 multifunction pin description ................................ ................................ ........................... 25 9.9 timer ................................ ................................ ................................ ................................ ... 25 9.10 decryption ................................ ................................ ................................ ........................ 26 9.11 host interface and interrupt(twsi and irq) ................................ ................................ . 26 9.12 register ................................ ................................ ................................ ............................. 28 10. pack age .......... ................... .................................................................................................................................. 45 page 2/45
AXP209 enhanced single cell li - battery and power system management ic 1. overview AXP209 is designed to be a highly - integrated power system management ic that is optimized for applications requiring single - cell li - battery (li - ion/polymer) and multiple output dc - dc converters. it is offering an easy - to - use and flexible complete sol ution which can fully meet the increasingly complexity of accurate power control required by modern application processor system. AXP209 incorporates an adaptive usb - compatible pwm charger, 2 buck dc - dc converter s , 5 linear regulators ( ldo s ) , voltage / curre nt / temperature and other multi - channel 12 - bit adc , a s well as 4 configurable gpio s . to ensure power system safety and stability, the AXP209 also integrates over / under ( ovp / uvp) , over temperature ( otp) , and overcurrent ( ocp) protection circuit s . with inte lli gent power select, ips? circuits, the AXP209 can distribute power safely and transparently among external ac - adapter, li - battery and application system load. it can still work normally when there is no battery (e.g. deeply discharged/defective battery) but only external input power source. the AXP209 provides a small, simple solution for obtaining power from three different power sources; single - cell li - ion battery, usb port, and ac - adapter. it can also support a rechargeable backup battery too. to ensure compatibility with a wide range of system processors, AXP209 uses a two wire serial interface ( twsi), through which application processor is capable of enabling/disabling power rails, programming voltages, accessing internal registers, as well as measurem ent data ( including fuel gauge). with the power monitoring results of high precision ( 1%, determined by the 1% bias resistance), end users will always know the real - time power consumption, which can bring them an unprecedented experience of power manageme nt. AXP209 provided 6mm x 6mm 48 - pin qfn package. applications pin definition ? handheld mobile devices smart mobile phones , pmp / mp4, number of cameras , digital cameras , handheld guide , air equipment , gps, pda, handheld digital radio and television receivers ? mobile internet devices , x pad ? digital photo frame, portable dvd player ultra - mobile pcs umpc an d umpc - like , learning machine ? should with department li device power road department ec ? application processor systems other batteries and multi - power applications confidential page 3/45
AXP209 enhanced single cel l li - battery and power system management ic 2. feature s ? intelligent power select ( ips) o wide input voltage range: 2.9v ~ 6.3v ( amr : - 0.3v ~ 11v) o configurable intelligent power delect "ips ?" system o adaptive usb ( support usb3.0 ) or ac adapte r with current limiting ( 4.4v / 900ma / 500ma / 100ma) o battery path is less than equivalent resistance of 75m ? fully integrated pwm charger o maximum charge current to 1.8a o support battery t emperature monitoring o full support of usb compatible c harge rs ( including usb 3.0 ) o high charging accuracy error of less than 0.5% o supports 4.1v/4.15v/4.2v/4.36v a nd other battery voltages o automatic charging process control and management o can directly drive led to i ndicate charging status o the system automatically adjus ts the charge current to suit the system load ? backup battery support o provision for a backup battery input supply an rtc module o support s backup battery charging , with adjustable charging current. ? 2 synchronous buck converter s o dc - dc1: the pwm charger o dc - dc2 : 1.6a 0.7 - 2.275v , adjustable 25mv / step, supporting vrc ( voltage ramp control) o dc - dc3 : 1.2a 0.7 - 3.5v, adjustable 25mv / step . ? 5 linear regulators ( ldo) o ldo1 : 30ma always on e o l do2 : 200ma low noise ldo , 1.8v ~ 3.3v , adjustable 100mv / step o ldo3 : 200ma 0.7 - 3.5v adjustable , 25mv / step o ldo4 : 200ma low noise ldo , 1.8v ~ 3.3v adjustable 100mv / step o ldo5 : 50ma low noise ldo, 1.8 - 3.3v adjustable , 100mv / step . ? timer ( timer) o 7bit timer , timing range 1 ~ 127 m inutes o timer interrupt output ? signal acquis ition system (signal capture) o built - in 12 - channel 12 bit adc o accept two external analog signal inputs o provide battery and external power supply voltage and current data o built - precision coulomb counter and fuel gauge system o provide a wealth of power mana gement information, such as instantaneous power ( ma or mw), the remaining battery capacity ( % or mah), the state of charge ( %) and remaining battery or charging time o two - level low - battery warning and protection o provides chip die temperature data ? applica tion processor interface (host interface) o host can exchange data through the twsi ( i2c) o flexible interrupt and sleep management o flexible pin function, multiple gpio can be set as io, adc and other functions o built - in configurable timer o provide 12 sets o f registers that can retain data when the system is shut down. ? system management ( system management) o support soft and hard reset o support for soft and hard shutdown o support for external wakeup triggers o supports output voltage monitoring and self - diagno stic function o output pwrok indication for system reset or shutdown o external power detection ( insertion/removal/sufficient current capacity) o supports soft power on via gpios o over / under voltage protection ( ovp / uvp) o overcurrent protection (ocp) o over - temperature protection (otp) o support otg vbus power state setting / monitoring ? highly integrated o internal precision voltage reference ( 0.5%) o built - in mosfet o timing and the output voltages can be customized ? decryption module (decryption) o 128bit otp password storage o dynamic real - time decryption algorithm confidential page 4/45
AXP209 enhanced single cell li - battery and power system management ic 3. typical application con fidential page 5/45
AXP209 enhanced single cell li - battery and power system management ic 4. absolute maximum ratings symbol description value units acin input voltage - 0.3 to 11 v vbus input voltage - 0 .3 to 11 v t j operating temperature range - 40 to 130 ts storage temperature range - 40 to 150 t lead maximum soldering temperature (at leads , 10sec) 300 v esd maximum esd stress voltage , human body model > 4000 v p d internal power dissipa tion 2100 mw 5. electrical characteristics v in = 5v , bat = 3.8v , t a = 2 5 symbol description conditions min typ max units acin v in acin input voltage 3.8 6.3 v i out v out current available before 500mv voltage drop 2500 ma loa ding bat v uvlo acin under voltage lockout 3.8 v v out ips output voltage 2.9 5.0 v r acin internal ideal diode on pin to pin, acin to 170 m resistance ipsout vbus v in vbus input voltage 3.8 6.3 v i out v out curren t available before 500 900 ma loading bat v uvlo vbus under voltage lockout 3.8 v v out ips output voltage 2.9 5.0 v r vbus internal ideal diode on pin to pin, vbus to 300 m resistance ipsout battery charger v trgt ba t charge target voltage - 0.5% 4.2 + 0.5% v i chrg charge current 1200 1800 ma i trkl trickle charge current 10% i chrg confidential page 6/45
AXP209 enhanced single cell li - battery and power system management ic ma v trkl trickle charge threshold 3.0 v voltage v rechg recharge battery threshold threshold voltage - 100 mv voltage relative to v target t timer1 charger safety timer trickle mode 40 min termination time t timer2 charger safety timer cc mode 480 min termination time i end end of charge indication cv mode 10% 15% i chrg current ratio ma backup battery v trgt backup battery charge target 2.5 3.0 3.1 v voltage i chrg backup battery charge current 50 200 400 ua i backup current when use backup 10 15 ua battery ntc v tl cold temperature fault charge 2.112 v 0 3.264 threshold voltage discharge 3.226 v th hot temperature fault threshold charge 0.397 v 0 3.264 voltage discharge 0. 282 v te ntc disable threshold voltage falling threshold 0.2 v hysteresis ideal diode r ds (on) on resistance (bat to ipsout) 75 m symbol description conditions min typ max units off mode current i batoff off mode current bat = 3.8v 27 a i suspend usb vbus suspend mode bat = 3.8v , 86 a current vbus = 5v , n_vbusen = 1 logic v il logic low input voltage 0.3 v v ih logic high input voltage 2 v twsi v cc input supply voltage 3.3 v address twsi address 0x68 f sck clock operating frequency 400 1200 khz t f clock data fall time 2.2kohm pull up 60 ns confidential page 7/45
AXP209 enhanced single cell li - battery and power system management ic t r clock data rise time 2.2kohm pull up 100 ns dcdc f osc oscillator frequency default 1.5 mhz dcdc2 i lim2 pmos switch current limit pwm mode 2300 ma i dc2out available output current pwm mode 1800 ma v dc2out output voltage range 0.7 2.275 v dcdc3 i lim3 pmos switch current limit pwm mode 1400 ma i dc3out available output current pwm mode 1000 ma v dc3out output voltage range 0.7 3.5 v symbol description conditions min typ max units ldo1 v ldo1 output voltage i ldo1 = 1ma 1.3 v - 1% 1% 3.3 i ldo1 output current 30 ma ldo2 v ldo2 output voltage i ldo2 = 1ma 1.8 3.3 v i ldo2 output current 200 ma psrr power supply rejection ratio i ldo2 = 60ma , 1khz tbd db e n output noise, 20 - 80khz vo = 3v, io = 150ma 28 v rms ldo3 v ldo3 output voltage i ldo3 = 1ma 0.7 3.5 v i ldo3 output current 200 ma psrr power supply rejection ratio i ldo3 = 10ma , 1khz tbd db e n output noise, 20 - 80khz vo = 1.8v, io = 150ma tbd v rms ldo4 v ldo3 output voltage i ldo3 = 1ma 1.8 3.3 v i ldo3 output current 200 ma psrr power s upply rejection ratio i ldo3 = 10ma , 1khz tbd db e n output noise, 20 - 80khz vo = 1.8v, io = 150ma 18 v rms ldo5 v ldo5 output voltage i ldo5 = 1ma 1.5 3.3 v i ldo5 output current 50 ma psrr power supply rejection ratio i ldo 5 = 10ma , 1khz tbd db e n output noise, 20 - 80khz vo = 1.8v, io = 30ma 18 v rms confidential page 8/45
AXP209 enhanced single cell li - battery and power system management ic 6. typical characteristics dc - dc efficiency vs. load (3.8vin ) dc - dc load transient (typical) confidential page 9/45
AXP209 enhanced single cell li - battery and power system management ic dc - dc ripple v ref vs temperatu re confidential page 10/45
AXP209 enhanced single cell li - battery and power system management ic v trgt vs temperature off mode current vs v bat confi dential page 11/45
AXP209 enhanced single cell li - battery and power system management ic 7. pin definition num name type condition function description 1 sda io data pin for serial interface, normally it connect a 2.2k resistor to 3.3v i / o power 2 sck i it is the clock pin for serial interface, normally it connect a 2.2k resistor to 3.3v i / o power 3 gpio3 io reg9eh [7] gpio 3 4 n_oe i power output on / off switch g nd: on ; ipsout: off 5 gpio2 io reg92h [2: 0] gpio 2 6 n_vbusen i vbus to ipsout selection gnd: ipsout select vbus high: ipsout do not select vbus 7 vin2 pi dcdc2 input source 8 lx2 io inductor pin for dcdc2 9 p gnd2 g nmos ground for dcdc2 10 dcdc2 i dc - dc2 feedback pin 11 ldo4 o output pin of ldo4 12 ldo2 o output pin of ldo2 confidential page 12/45
AXP209 enhanced single cell li - battery and power system management ic 13 ldo24in pi input to ldo2 and ldo4 14 vin3 pi dcdc3 input source 15 lx3 io inductor pin for dcdc3 16 pgnd3 g nmos gnd for dcdc3 17 dcdc3 i feed back to dcdc3 18 gpio1 io gpio 1 reg93h [2: 0] adc input 19 g pio0 io gpio 0 reg90h [2: 0] low noise ldo / switch adc input 20 exten o external power enable 21 aps pi internal power input 22 agnd g analog ground 34 bias io external 200kohm 1% resistor 24 vref o internal reference voltage 25 pwrok o power good indication output 26 vint po internal logic power, 2.5v 27 ldo1set i it set the ldo1 default voltage. 28 ldo1 o ldo1 output , for host rtc block 29 dc3set i it set the dcdc3 default voltage 30 backup io backup battery pin 31 vbus pi usb vbus input 32 , 33 acin pi adapter input 34 , 35 ipsout io main battery 36 chgled o charger status indication 37 ts i battery temperature sensor input or an external adc inp ut 38 , 39 bat po system power source 40 ldo3in o ldo3 input source 41 ldo3 i output pin of ldo3 42 batsense i current sense port1 43 chsense o current sense port2 44 vin1 pi dcdc1 input source 45 lx1 io inductor pin for dcdc1 46 pgnd1 g nmos ground for dcdc1 47 pwron i power on - off key input , internal 100k pull high to aps 48 irq / io irq output or wakeup wakeup 49 ep g exposed pad, need to connect to system ground confidential p age 13/45
AXP209 enhanced single cell li - battery and power system management ic 8. functional block diagram n_oe control logic dcdc3 lx3 dc - dc3 vin3 pgnd3 dc3set irq sck serial interface gpio3 sda gpio2 gpio1 gpio0 / ldoio0 bat exten ts temperature register monitor output voltage pwrok monitor / lbo bias 12 bit adc reference current monitor vref voltage voltage monitor agnd vint temperature monit or ep confidential page 14/45
AXP209 enhanced single cell li - battery and power system management ic 9. control and operation when AXP209 powers on and tws i nterface sck / sda pins are p ulled to host io voltage source, the host can then adjust and monitor the AXP209. this provides f lexible adjustment and monitoring options, and a wealth of information. note: "ho st" referring to the main application processor note: "external power supply" refers to acin and vbus inputs . 9.1 power on / off & reset button(pek) AXP209 pwron pin c an be connected to gnd through a button, as a power enable key (pek) o r hibernation / w ake button. the AXP209 c an automatically identify long and short button presses and react accordingly. power on sources: 1 . acin , vbus , a nd battery 2 . n_oe transition f rom high to low. 3 . pek press power on system power - on is initiated whenever the following conditions occur: 1. when n_oe i s low, and upon connection of a power supply that meet s the requirements ( acin or vbus > 3.8v , and the battery voltage is higher than the shutdown voltage ) , AXP209 w ill automatically boot ( a utomatic boot ing on power s upply connection can be configured by the developer) . 2. n_oe is low and the system is powered off, press pek can power on AXP209. if required the host 3. when there is a valid external power source or battery present and n_oe changes from high to low, AXP209 wi ll be turned on. after power on, dc - dc and ldo will be soft booted in a preset timing sequence, and then either the host or pwren the pin can enable/disable power. shutdown (power off) when you push - and - hold pek longer than irqlevel, host can write 1 intoreg32h [7] to inform axp202 to shutdown, which can disable all power output except ldo1. system power - off is initiated whenever the following conditions occur: 1. input voltage is too low( low - power protection) 2. power output voltage is too low due to o verload( overload protection) confidential page 15/45
AXP209 enhanced single cell li - battery and power system management ic 3. input voltage is too high( overvoltage protection)( see more details in chapter intelligent power select 4. have waited more than 2s(default) when n_oe changes from hight to low 5. push pek longer more than offlevel( default 6s), and system will cut off all power output except ldo1( there is no need for an extra reset key) note: with the automatic protection mechanism, axp20 9 can protect the whole system by preventing components suffering from irreversible damage due to system abnormality. sleep and wakeup when the running system needs to enter sleep mode, reg31h [3] will determine whether one or several power rails should be disabled or change to other voltage. wakeup can be trigged by either pek signal, or the rising/falling edge of gpio0, gpio1, gpio2, gpio3 (to be the rising or falling edge, or both can be programmed by reg90h[7:6], reg92h[7:6], reg93h[7:6], and reg95h[7 :6]), with all power rails resume to default voltage in default power on timing sequence. note: pek irq ( reg42h[1]), gpio0 input edge irq (reg44h[0]) , gpio1 input edge irq ( reg44h[1]), gpio2 input edge irq ( reg44h[2]), gpio3 input edge irq (reg44h[3]) shoul d be enabled to notify the processor to exit sleep mode via irq pin. see control process under sleep and wakeup modes as below: confidential page 16/45
AXP209 enhanced single cell li - battery and power system management ic system reset function and output monitoring (pwrok) the pwrok in AXP209 can be used as the reset signal for the application system. during AXP209 startup, pwrok outputs low level, which will then be pulled high to startup and reset the system after al l output voltage reaches the regulated value. under normal operation, the AXP209 will be always monitoring the voltage and load status. if overload or under - voltage occurs, the pwrok will instantly be driven low to reset the system and prevent data losses . 9.2 power path management (ips) the AXP209 power input can come from lithium battery ( bat ) , usb vbus input, external power supply ( acin ) . the ips will select an appropriate power source depending on the battery and external power conditions. o when onl y the battery is available , no external power input, the battery powers the system ; o when there is a valid external power source ( vbus or acin) , is is the preferred power supply. o when the external power is removed, the ips will seamlessly switch over to battery power. o when both vbus a nd acin are available, acin will be used to power the system and recharge the lithium battery; o if the acin cannot provide sufficient current, vbus is also connected to source more current ; o if the drive capacity is sti ll insufficient, then the charge current is reduced to zero , the b attery is used to power the system. therefore, compatibility of the system with external powers of different drive ability can be dramatically improved, and no special customized adapters a re required to be provided on the part of manufacturers. please refer to the following diagram. as shown above, when acin provides insufficient load ability, ipsout voltage will fall, and bat will change from charge to discharg e to supply load current together with acin. confidential page 17/45
AXP209 enhanced single cell li - battery and power system management ic the host can set ips parameters and read the feedback by using internal registers in AXP209 via twsi. voltage limiting/current limiting mode and direct mode in order not to affect the usb communication, vbus is always working under voltage - limit mode by default. in this mode, AXP209 ensures that vbus voltage remains above a configurable reference voltage vhold wh ich can meet the usb specification. the default vhold is 4.4v, adjustable in reg30h [5:3] register. if the system has limit on current obtained from usb vbus, a current - limit mode is provided (see reg30h[1] register), with 900ma/500ma/100ma (reg30h [0]) s electable. if the system just utilizes the usb for power supply rather than communication, or the usb power adapter is utilized, AXP209 can be set to vbus direct mode by modifying register reg30h[6], and then axp202 will give priority to the application power demand. when the drive ability of usb host is insufficient or system power consumption is large then the vbus voltage is lower than vhold, axp202 will release irq to indicate the weak power supply ability of host vbus, which may affect usb communica tion, and then host software will follow up. axp20 9 s reaction to external power supply connection AXP209 can automatically detect the connection of external power and judge whether the power is usable or not. the result will be set in corresponding regi sters, and irq will be asserted to inform the host at the same time. the following table has listed the status bits and meanings of external power registers: status register bits description register reg00h [7] indicates the presence of external acin re gister reg00h [6] indicates whether the external acin is usable or not register reg00h [5] indicates the presence of external vbus register reg00h [4] indicates whether the external vbus is usable or not register reg00h [3] indicates whether the vbus vo ltage is above v hold when used register reg00h [1] indicates whether acin/vbus short circuits on pcb or not register reg00h [0] indicates whether the system is triggered to startup by acin/vbus the status bit indicating whether the vbus voltage is abo ve v hold or not when used allows the host to judge when it receives irq7 (indicating weak supply ability) whether vbus is pulled low by system load input or the external power itself is below v hold , which may facilitate host software to decide either to k eep on working in voltage - limit mode or switch to direct mode. when to select vbus as input power n_vbusen and register reg30h[7]: is used to determined when shall vbus be used as the power supply n_vbusen reg30h [7] input power description low 0 vbu s select if vbus is valid and no acin is available low 1 vbus select if vbus is valid confidential page 18/45
AXP209 enhanced single cell li - battery and power system management ic high 1 vbus select if vbus is valid high 0 acin / bat dont sele ct vbus low - power warning and low - power protection (automatic poweroff) the value of v warning ( low - power warning voltage) and v off ( automatic shutdown voltage) can be configured. if the system power is found to be lower than v warning, irq19/irq20 will be released. if aps is lower than v off, axp202 will automatically enter shutdown mode, and disable all other outputs except ldo1. there are two - levels in v warning , namely, level 1 and level 2, which can be defined differently in applications. for example, u se level1 to indicate insufficient power while level 2 can be used to indicate the oncoming shutdown. the default values of v warning and v off can be respectively set in registers reg3ah reg3bh and reg31h[2:0]. over - voltage protection if the external power voltage exceeds 6.3v, AXP209 will send irq1/4 for indication. if the external power voltage exceeds 7v, AXP209 will automatically shutdown the system. 9.3 adaptive pwm charger the a xp209 integrates a constant current/voltage pwm charger to automatically control the charge cycle, with a built - in safety clock capable of automatic charge termination without host processor intervention. this charger features automatic charge current scal ing in accordance with the system power consumption, as well as battery detection, trickle charge and activation. in addition, the built - in temperature detection circuit can automatically decrease the charge current when the temperature is too high or too low. compared with traditional linear chargers, this pwm charger features dramatic efficiency increase and power consumption decrease in systems that require large power consumption and fast battery charging, and thus greatly improve the system temperature performance. adaptive c harging startup the default state of the charger is enabled. ( it can be programmed via registers. refer to register reg33h.) when external power is plugged in, AXP209 will firstly judge whether it is suitable. if the charger is suitable for the power, and the charge function is allowed, AXP209 will automatically start the charge, and send irq to host. at the same time, ghgled pin will output low level to drive external led to indicate the charging state. charging voltage and cu rrent: confidential page 19/45
AXP209 enhanced single cell li - battery and power system management ic v trgt i chrg v trkl i trkl v trgt = charge target voltage. the v trgt is 4.2v by default, which can be set via a register (re fer to reg33h[6:5]) . at the same time, AXP209 will automatically adjust the charge target voltage when external power voltage is low. v rch = automatic recharge voltage. v rch =v trgt - 0.1v charging current the charge current is 500maor 1200ma by default, which can be set by reg33h [3:0]. charging process if the battery voltage is lower than 3.0v, the charger will automatically enter the pre - charge mode, with charge current being 1/10 of the preset value. if the battery voltage is still below 3.0v 40 min utes later ( adjustable, see reg34h), the charger will automatically enter the battery activate mode. refer to battery activate mode section for details. once the battery voltage exceeds 3.0v, the charger enters constant current mode. if the charge cur rent is below 65% of the preset value, the system will send irq17 to indicate that drive ability of external power is insufficient, as a result, the charge current is lower than the preset value, which may lead to longer charge time, so stronger power is preferred, or power - consuming functions should be disabled to shorten the charge time. when the battery voltage reaches the v trgt, the charger will switch from the constant current mode to constant voltage mode, and the charge current will taper off. w hen the charge current is lower than 10% or 15% (adjustable, see register reg33h) of the preset value, a charge cycle ends, and axp202 will release irq18 while the chgled pin will stop indicating the charging state. when the battery voltage is below v rch again, the automatic charge will restart, and irq17 will be issued. confidential page 20/45
AXP209 enhanced single cell li - battery and power system management ic in non - precharge mode, if the charge cycle is not ending after 480 minutes ( adju stable, refer to register reg34h), the charger will automatically enter the battery activate mode. battery activation mode at the entering the battery activation mode from either pre - charge mode or constant current mode (the timer expires), AXP209 will issue irq10 in both cases to indicate that the battery may be damaged/faulty. in battery activate mode, the charger always inputs relatively low current to batteries. AXP209 will exit activate mode and release irq11 only if the battery voltage has reached v rch. AXP209 will indicate whether the charger is in battery activate mode or not in register reg01h. chgled chgled pin is used to indicate charge state and warning. there are four states, namely, charging, not charging, battery abnormal warning, and ex ternal power over - voltage warning. chgled is nmos open drain output, so a led can be directly driven by a current - limit resistor to show the four states. the following table has displayed its two operation modes. reg34h [4] status chgled state comments 0 charging low not charging hi z battery abnormal 1hz flashing the charger enters the battery activate mode, or the battery temperature is too high/low. overvoltage 4hz flashing external power input voltage is too high 1 charging 1hz flashing can not be charged hi no external power supply not charging low overvoltage 4hz flashing external power input voltage is too high, or the battery temperature is too high, too low battery temperature detection the AXP209 can connect a temperature - sensitive resistor via the ts pin to monitor the battery temperature when the battery is charging or discharging. the diagram is shown below. confidential page 21/45
AXP209 enhanced single cell li - battery an d power system management ic bat 10uf ts c2 ntc gnd in the diagram above, vth/vtl refers to the high temperature threshold and low temperature threshold, which is programmable via registers reg38h/39h/3ch/3dh respectively. vte=0.2v. the temperature sensitive resistor suggested is a ntc temperature - sensitive resistor, which is 10kohm and 1% accuracy at 25 . the AXP209 will send a constant current via ts pin, and the current can be set as 20ua, 40ua, 60ua, and 80ua (see registerreg84h) to adapt to different ntc resistors. when the current goes through the temperature - sensitive resistor, a voltage is genera ted, which will be measured by adc, and compared with regulated value to release corresponding irq or suspend the charge. if the resistance value of temperature - sensitive resistor is too high or too low, extra resistors can be placed in series or parallel to expand the detect extent. if the battery does not incorporate a themistor, the ts pin can be linked to the ground, and in that case, AXP209 will automatically disable the battery temperature monitoring function. battery detection AXP209 will automati cally detect the battery presence, record the result in registers (refer to reg01h) and send irq13, irq14. battery detection can be enabled and disabled by the host. (refer to register reg32h.) 9.4 backup battery the AXP209 supports backup battery char ging and discharge. when no main power(bat/acin/vbus) is available, ldo1 will choose the backup battery to support the operation of some circuits, such as the system real - time clock, etc. when there is a main power, reg35h[7] can be set to charge the back up battery, whose target voltage is 3.0v by default (adjustable via reg35h[6:5]) and charge current is 200ua by default ( adjustable via reg35h[1:0]). confidential page 22/45
AXP209 enhanced single cell li - battery and power system management ic 9.5 multi - channel power output AXP209 provides multiple output voltage s as follows : output path type d efault voltage application examples drive capability dcdc2 buck configurable 1.25vcore 1600 ma dcdc3 buck configurable 2.5vddr 700 ma ldo1 ldo conf igurable rtc 30 ma ldo2 ldo configurable analog / fm 200 ma ldo3 ldo configurable 1.3v pll 200 ma ldo4 ldo configurable 1.8v hdmi 200 ma ldo5 ldo configurable vmic 50 ma AXP209 comes with two synchronous step - down dc - dcs, five ldos, as well as multip le timing and controlling methods. the operating frequency of dc - dc converters is 1.5mhz by default, which is adjustable via registers. external small inductors and capacitors can be connected as well. in addition, both dc - dcs can be set in pwm mode or aut o mode ( automatically switchable according to the AXP209 load). see register reg80h. dc - dc2 / 3 dcdc3 output voltage ranges from 0.7 v to 3.5v, and output voltage of dcdc2 is ranged from 0.7 - 2.275v , which can be programmed via registers.(refer to regist er reg23h 27h). dcdc2/3 output capacitor is recommended to use small esr ceramic capacitors above 10uf x7r; when the output voltage is set above 2.5v 2.2uh inductors is recommended; when the output voltage is set under 2.5v, 4.7uh inductors is recommended. besides, the inductor saturation current should be more than 50% of the largest demanded current. the following is a list of recommended inductor - c apacitor : inductor model current specifications dc resistance murata lqh55pn2r2nr0 2100ma@2.2uh 30mohm murata lqh55pn4r7nr0 1400ma@4.7uh 60mohm murata lqh44pn2r2mp0 2000ma@2.2uh 49mohm murata lqh44pn4r7mp0 1700ma@2.2uh 80mohm tdk vlf5010st - 2r 2m2r3 2700ma@2.2uh 41mohm tdk vlf5014st - 4r7m1r7 1700ma@4.7uh 98mohm tdk slf6045t - 4r7n2r4 - 3pf 2400ma@4.7uh 27mohm capacitor model temperature characteristics tolerance tdk c2012x5r0j475k x5r / x7r 10%@4.7uf tdk c2012x5r0j106k x5r / x7r 10% @ 10uf murata grm31e71a475k x7r 10%@4.7uf murata grm21e71a106k x7r 10% @ 10uf murata grm31e71a106k x7r 10% @ 10uf confidential page 23/45
AXP209 enhanced single cell li - battery and power system management ic ldo1 ldo1 is always on and can be us ed to supply continuous power for application rtc with 30ma drive ability of 30ma. ldo2/3/4 ldo2/4 output noise is as low as 18uvrms and can be used to supply power for analog circuits of application system. ldo3 can supply power for systems like sram or pll with 200ma drive ability. ldo5 ldo5 also features the low noise design, and its drive ability is 50ma . soft start all dc - dcs and ldos support soft start which can avoid the impact of dramatic current change on the input path in system boot stage. self - diagnosis: load monitoring and current limiting all dc - dcs and ldos support load monitoring and current - limit functions. when t he load current exceeds its drive ability, all output voltages will decrease to protect the internal circuits. when the two dc - dcs output voltage is lower than 85% of the set voltage, AXP209 will automatically shutdown. at the same time, the system will re cord the detailed output voltage that has lead to automatic shutdown ( refer to register reg46h[5:2]) and issue a corresponding irq. all dc - dcs do not require external schottky diodes and resister divider feedback circuits. if a certain dc - dc is unnecessar y in the application, just float the corresponding lx pins. 9.6 the default voltage/start timing settings(default voltage / timing setting) the AXP209 provides c ustomizable default voltage settings of each power supply and start up timing. boot timing : includes 8 levels , and the interval between each level can be set, from 1 , 4 , 16 , 32 m s . d efault voltage setting : each dc - dc / ldo can be set from the lowest to the highest voltage of the range . ldo1set pin for setting ldo1 initial voltage: ldo1set ldo1set = gnd ldo1set = vint ldo1 voltage 1.3v 3.3v dc3set pin for setting dc - dc3 initial voltage: dc3set dc3set = gnd dc3set = aps dc3set = floating dc - dc3 voltage 1.8v 3.3v / 2.5v 1.2v / 1.5v for more information, se e the default configuration instructions section. confidential page 24/45
AXP209 enhanced single cell li - battery and power system management ic 9.7 signal acquisition system simple battery monitors estimate the battery energy by measuring the b attery voltage. however, the multiple 12 - bit adcs in the AXP209 can measure battery voltage, as well as battery current and external power voltage and current. it integrates battery charge and discharge coulomb counter. using this data, the host is capable of calculating accurately the battery energy and other battery data, such as the system real - time consumption, remaining battery energy, battery charge progress, remaining battery using time and charge time, etc. the enabled state and sampling rate of ea ch adc can be set via registers reg82h, 83h, 84h. the sampling results will be saved in corresponding registers, and reference can be made to the adc data in register instruction section. the input range of gpio[1:0] can be set via register reg85h, while r egister reg00h[2] is used to indicate the battery charge/discharge current directions. channel 000h step fffh battery voltage 0mv 1.1mv 4.5045v bat discharge current 0ma 0.5ma 4.095a bat charge current 0ma 0.5ma 4.095a acin vol tage 0mv 1.7mv 6.9615v acin current 0ma 0.625ma 2.5594a vbus voltage 0mv 1.7mv 6.9615v vbus current 0ma 0.375ma 1.5356a internal temperature - 144.7 c 0.1 c 264.8 c aps voltage 0mv 1.4mv 5.733v ts pin input 0mv 0.8mv 3.276v gpio0 0 / 0.7v 0.5mv 2.0475 / 2.7475v gpio1 0 / 0.7v 0.5mv 2.0475 / 2.7475v 9.8 multifunction pin description(multi - function pin description) gpio [3: 0] gpio[3:0] can be defined as adc input (monitoring external signals), or ldo, etc. please refer to reg90h - 96h instru ction for details. chgled features charge state indication, over - temperature/over - voltage warning, and gpo. please refer to reg32h instruction section for details. 9.9 timer AXP209 contains a 7 bit internal timer, the value is set by register reg8ah [6 : 0] . if the register is set to 0 , the timer is d isable d. if reg8ah [6: 0] = a , the timer starts count from 0 to a and set s reg8ah [7] , also confidential page 25/45
AXP209 enhanced single cell li - battery and power system management ic issuing a t imer interrupt. write 1 in register reg8ah [7] t o clear the flag and re - start timing. clear ing interrupt flag will not re - s tart counting. the minimum step size for the timer is 1 m inute, and the timing range 1 ~ 127 minutes. 9.10 decryption AXP209 conta ins a decryption module. the host writes data to reg300 - reg30f to be decrypted, and then writes 1 to the register regb8h [1] to s tart decryption . after the decryption is complete, status bit regb8 [0] is set to 1 . t hen the host can read back the decrypted data from reg31x. starts again automatically when t he decryption AXP209 status bits are clared. 9.11 host interface timing and interrupt (twsi and irq) ... ... ... .. . ... ... ... .. . ... ... ... ... .. . .. . figure 1: single read and write confidential page 26/45
AXP209 enhanced single cell li - battery and power system management ic fig ure 2: multi read and write host can access the AXP209 registers via the twsi interface, and the operation timing is shown above. standard 100khz or 400khz frequency is supported, and the highest rate can reach 1.2mhz. in addition, multi read and write op eration is supported, and the device addresses are 69h ( read) and 68h (write). when certain events occur, AXP209 will inform the host by pulling down the irq interrupt line, and the interrupt state will be stored in interrupt state registers ( see register s reg48h, reg49h, reg4ah, reg4bh and reg4ch). the interrupt can be cleared by writing 1 to corresponding state register bit. when there is no interrupt, irq output will be pulled high (by 51k external pull - up resistor). each interrupt can be masked via int errupt control registers ( refer to registers reg40h, reg41h, reg42h, reg43h, and reg44h). location interrupt meaning location interrupt meaning register 48h [7] irq1 power supply acin over voltage register 4ah [3] irq20 dcdc3 voltage is too low regis ter 48h [6] irq2 power supply acin insert ed register 4ah [2] reservations register 48h [5] irq3 power supply acin remove d register 4ah [1] irq22 pek short press register 48h [4] irq4 power supply vbus overvoltage register 4ah [0] irq23 pek press reg ister 48h [3] irq5 power supply vbus insert ed register 4bh [7] irq24 n_oe boot register 48h [2] irq6 power supply vbus remove d register 4bh [6] irq25 n_oe shutdown register 48h [1] irq7 vbus voltage is less than vhold register 4bh [5] irq26 vbus effec tive register 48h [0] reserv ed register 4bh [4] irq27 vbus invalid register 49h [7] irq8 battery access register 4bh [3] irq28 vbus session valid register 49h [6] irq9 remove the battery register 4bh [2] irq29 vbus session end register 49h [5] irq1 0 into the battery activation mode register 4bh [1] irq30 low battery warning level1 confidential page 27/45
AXP209 enhanced single cell li - battery and power system management ic register 49h [4] irq11 exit battery activation mode re gister 4bh [0] irq31 low battery warning level2 register 49h [3] irq12 charging register 4ch [7] irq32 timer interrupt register 49h [2] irq13 charging complete register 4ch [6] irq33 pek rising edge register 49h [1] irq14 battery temperature is too high register 4ch [5] irq34 pek falling edge register 49h [0] irq15 battery temperature is too low register 4ch [4] reserv ed register 4ah [7] irq16 ic internal over - temperature register 4ch [3] irq35 gpio3 edge trigger input register 4ah [6] irq17 charging current shortage register 4ch [2] irq36 gpio2 edge trigger input register 4ah [5] irq18 dcdc1 voltage is too low register 4ch [1] irq37 gpio1 edge trigger input register 4ah [4] irq19 dcdc2 voltage is too low register 4ch [0] irq38 gpio0 edge trigger in put 10 registers group 1: power control address register description r / w d efault value 00 power status register r 01 power mode / charging status register r 02 otg vbus status register r 04 - 0f data buffer register r / w 00h 12 dc - dc2 / 3 & ldo2 / 3/4 & exten control register r / w xxh 23 dc - dc2 voltage setting register r / w xxh 25 dc - dc2/ldo3 voltage ramp parameter r / w 00h 27 dc - dc3 voltage setting register r / w xxh 28 ldo2 / 3 voltage setting register r / w xx h 30 vbus - ipsout path setting register r / w 60h 31 v off shutdown voltage setting register r / w x3h 32 shutdown, battery detection , chgled c ontrol r / w 46h 33 charge control register 1 r / w cxh 34 charge control register 2 r / w 41h 35 backup battery charging control register r / w 22h 36 pek parameter setting register r / w 5dh 37 dcdc converter operating frequency setting r / w 08h 38 battery charging low temperature alarm setting r / w a5h 39 battery charging temperature alarm setting r / w 1fh 3a aps low power level1 setting register r / w 68h 3b aps low power level2 setting register r / w 5fh 3c battery discharge and low temperature alarm setting register r / w fch 3d b attery discharge temperature alarm setting r / w 16h 80 dcdc work mode setting register r / w e0h 82 adc enable setting register 1 r / w 83h confidential page 28/45
AXP209 enhanced single cell li - battery and power system management ic 83 adc enable setting register 2 r / w 80h 84 adc sample rate settings, ts pin control register r / w 32h 85 gpio [1: 0] input range setting register r / w x0h 86 gpio1 adc irq rising edge threshold setting r / w ffh 87 gpio1 adc irq falling threshold setting r / w 00h 8a timer control register r / w 00h 8b vbus monitoring setting register r / w 00h 8f over temperature shutdown control r / w 01h group 2: gpio control address register description r / w d efa ult value 90 gpio0 control register r / w 07h 91 ldo5 output voltage setting register r / w a0h 92 gpio1 control register r / w 07h 93 gpio2 control register r / w 07h 94 gpio [2: 0] signal status register r / w 00h 95 gpio3 control register r / w 00h group 3: interrupt control address register description r / w d efault value 40 irq enable control register 1 r / w d8h 41 irq enable control register 2 r / w ffh 42 irq enable control register 3 r / w 3bh 43 irq enable control register 4 r / w c1h 44 irq enable control register 5 r / w 00h 48 irq status register 1 r / w 00h 49 irq status register 2 r / w 00h 4a irq status register 3 r / w 00h 4b irq status register 4 r / w 00h 4c irq statu s register 5 r / w 00h group 4: adc data address register description r / w 56 [7: 0] acin voltage adc data high 8 bit r 57 [3: 0] acin voltage adc data low 4 bit r 58 [7: 0] acin current adc data high 8 bit r 59 [3: 0] acin c urrent adc data low 4 bit r 5a [7: 0] vbus voltage adc data high 8 bit r 5b [3: 0] vbus voltage adc data low 4 bit r 5c [7: 0] vbus current adc data high 8 bit r confidential page 29/45
AXP209 enhanced single cell li - battery an d power system management ic 5d [3: 0] vbus current adc data low 4 bit r 5e [7: 0] AXP209 internal temperature monitoring adc data high 8 bit r 5f [3: 0] AXP209 internal temperature monitoring adc data low 4 bit r 62 [7: 0] ts input adc data high 8 bit, the default monitor battery temperature r 63 [3: 0] ts input adc data low 4 bit, the default monitor battery temperature r 64 [7: 0] gpio0 voltage adc data high 8 bit r 65 [3: 0] gpio0 voltage adc data low 4 bit r 66 [7: 0] g pio1 voltage adc data high 8 bit r 67 [3: 0] gpio1 voltage adc data low 4 bit r 70 [7: 0] high instantaneous power battery 8 bit r 71 [7: 0] instantaneous power in the battery 8 bit r 72 [7: 0] instantaneous battery power is low 8 bit r 78 [7: 0] battery voltage is high 8 bit r 79 [3: 0] battery voltage is low 4 bit r 7a [7: 0] battery charge current high 8 bit r 7b [3: 0] battery charge current low 4 bit r 7c [7: 0] battery discharge current high 8 bit r 7d [4: 0] ba ttery discharge current low 5 bit r 7e [7: 0] system ipsout high voltage 8 bit r 7f [3: 0] system ipsout voltage low 4 bit r note: the battery - powered power calculation method pbat = 2 * register values * voltage lsb * current lsb / 1000 . where the voltage lsb is 1.1mv ; current lsb is 0.5ma , calculated in units of mw . address register description r / w d efault value b0 coulomb charging the battery meter data register [31:24] r / w 00h b1 coulomb charging the battery meter data register [23:16] r / w 00h b2 coulomb charging the battery meter data register [15: 8] r / w 00h b3 coulomb charging the battery meter data register [7: 0] r / w 00h b4 coulomb gauge battery discharge data register [31:24] r / w 00h b5 co ulomb gauge battery discharge data register [23:16] r / w 00h b6 coulomb gauge battery discharge data register [15: 8] r / w 00h b7 coulomb gauge battery discharge data register [7: 0] r / w 00h b8 coulomb gauge and encryption module control regis ter r / w 00h b9 power measurement result register r / w 00h coulomb calculation method: c= 65536 * current lsb * charge coulomb counter value - discharge coulomb counter value / 3600 / adc sample rate. refer to reg84h setting for adc sample rate the current lsb is 0.5ma unit of the calculation result is mah. confidential page 30/45
AXP209 enhanced single cel l li - battery and power system management ic 10.1 reg 00h:input power status bit description r / w 7 acin presence i ndicat ion r 0: acin does not exist; 1: acin exist 6 instructions acin is available r 5 vbus presence indication r 0: vbus does not exist; 1: vbus exist 4 indicates if vbus is useable r 3 indicating whether the vbus voltage is above v hold before used. r 2 indicates that the battery current direction r 0: battery discharg ing ; 1: the battery is charging 1 indicating whether acin and vbus input short circuit on pcb r 0 r indicating whether the boot source is acin or vbus 0: boot source isnt acin/vbus 1: boot source is acin/vbus. 10.2 reg 01h:power mode and charge status indication bit desc ription r / w 7 i ndicates AXP209 over - temperature r 0: not too hot ; 1: over temperature 6 charging indicator r 0: not charging or charging has been completed; 1: charging 5 battery connected indicat or r 0: no battery is connected to t he AXP209 ; 1: the battery is connected to the AXP209 4 reservations can not be changed r 3 indicate whether the battery charger entered into activa tion mode r 0: did not enter the cell activation mode; 1: has entered the cell activation mode 2 indicates the charging current is less than the expected current r 0: the actual charge current equal to the desired current; 1: the actual charge current is less than the desired current 1 - 0 reserved, can not be changed r 10.3 reg 02h: usb otg vbu s status indication bit description r / w 7 - 3 reserved, can not be changed 2 indicating whether vbus is valid or not 1 means valid r 1 indicating whether vbus is valid or not 1 means valid r 0 indicating session end status 1 means valid r confidential page 31/45
AXP209 enhanced single cell li - battery and power system management ic 10.4 reg 04 - 0fh: data cache note : as long as the external power supply, battery or backup battery power exists , this data will not be lost. 10.5 reg 12h:power output control the default value : xxh bit description r / w d efault value 7 reserved, can not be chan ged rw x 6 ldo3 switch control 0: shut down; 1: turn on rw x 5 reserved, can not be changed rw x 4 dc - dc2 switch control 0: shut down; 1: turn on rw x 3 ldo4 switch control rw x 2 ldo2 switch control rw x 1 dc - dc3 switch control rw x 0 exten switch control rw x 10.6 reg 23h: dc - dc2 output voltage setting the default value : xxh bit description r / w d efault value 7 - 6 reserved, can not be changed 5 - 0 dc - dc2 the output voltage is set 0.7 - 2.275v , 25mv / step rw x vout = [0.7 + (bit5 - 0 ) * 0.025] v 10.7 reg 25h: dc - dc2 / ldo3 dynamic voltage scaling parameter settings the default value : 00h bit description r / w d efault value 7 - 4 reserved, can not be changed 3 ldo3 vrc enable control rw 0 0: turn on; 1: shut down 2 dc - dc2 vrc enable control rw 0 0: turn on; 1: shut down 1 ldo3 vrc soft start control 0: 25mv / 15.625us = 1.6mv / us rw 0 1: 25mv / 31.250us = 0.8mv / us 0 dc - dc2 vrc soft start control 0: 25mv / 1 5.625us = 1.6mv / us rw 0 1: 25mv / 31.250us = 0.8mv / us confidential page 32/45
AXP209 enhanced single cell li - battery and power system management ic 10.8 reg 27h: dc - dc3 output voltage setting the default value : xxh bit desc ription r / w d efault value 7 reserved, can not be changed 6 - 0 dc - dc3 output voltage setting 0.7 - 3.5v , 25mv / step rw x vout = [0.7+ (bit6 - 0 ) * 0.025] v 10.9 reg 28h: ldo2 / 4 output voltage setting the default value : xxh bit description r / w d efault value 7 - 4 ldo2 output voltage setting 1.8 - 3.3v , 100mv / step rw x vout = [1.8+ (bit7 - 4 ) * 0.1] v 3 - 0 ldo 4 output voltage setting 1.25 , 1.3 , 1.4 , 1.5 , 1.6 , 1.7 , 1.8 , 1.9 , 2.0 , 2.5 , 2.7 , 2.8 , 3.0 , 3.1 , 3.2 , 3.3 rw x 10.10 reg 29h : ldo3 output voltage setting the default value : xxh bit description r / w d efault value 7 ldo3 mode selection: rw 0 0 : ldo mode, the voltage is set by [6: 0] 1 : enable/disable control mode , voltage is determined by ldo3in. 6 - 0 ldo3 output vol tage setting 0.7 - 2.275v , 25mv / step vout = [0.7+ (bit6 - 0 ) * 0.025] v rw x 10.11 reg 30h: vbus - ipsout power path management the default value : 6xh bit description r / w d efault value 7 vbus - ipsout path selection control signal source rw 0 0: by n_vbusen pin controls whether to enable this path 1: vbus - ipsout enabled , regardless of n_vbusen state 6 vbus v hold voltage limiting control rw 1 0: no voltage drop limit ; 1: limit the voltage drop 5 - 3 v hold set v hold = [4.0+ (bit5 - 3 ) * 0.1] v rw 100 2 reserved, can not be changed 1 - 0 vbus current - limit selection when current - limit is enabled 00:900ma ; 01:500ma; 10:100ma; 11:no limit rw 0 confidential page 33/45
AXP209 enhanced single cell li - ba ttery and power system management ic 10.12 reg 31h: v off shutdown voltage setting the default value : x3h bit description r / w d efault value 7 - 4 reserved, can not be changed 3 sleep mode pek o r gpio e dge wakeup enable settings: 0 : disable 1 : enable this bit will be automatically cleared to 0 after writing , so 1 should be rewritten whenever entering sleep mode. 2 - 0 v off set ting v off = [2.6+ (bit2 - 0 ) * 0.1] v rw 011 default : 2.9v 10.13 reg 32h:shutdown settings, battery detection, and chgled pin control the default value : 46h bit description r / w d efault value 7 shutdown control rw 0 this bit is write 1 will shutdown the AXP209 o utput s 6 battery monitoring function setting bit : 0: shut down; 1: turn on rw 1 5 - 4 chgled pin function setting 00: hi rw 00 01: 25% 1hz flashing 10: 25% 4hz flashing 11: output low 3 chgled pin control settings 0: controlled by charging rw 0 1: controlled b y reg 32h [5: 4] 2 output off timing sequence contro l 0: shutdown simultaneously rw 0 1: shutdown in reverse sequence to startup 1 - 0 rw 10 shutdown delay time after n_oe changes from low to high 00: 128ms ; 01: 1s ; 10: 2s ; 11: 3s 10.14 reg 33h:charge control 1 the default value : cxh bit description r / w d efault value 7 charging function enable control bit rw 1 0: disable , 1: enable 6 - 5 charging target voltage setting 00: 4.1v ; 01: 4.15v ; 10: 4.2v ; 11: 4.36v rw 10 confidential page 34/45
AXP209 enhan ced single cell li - battery and power system management ic 4 charge termination current settings rw 0 0: end when c harging current is less than 10% of the set value 1 : end when c harging current is less than 1 5 % of the set value 3 - 0 charge current se tting rw x i charge = [300+ (bit3 - 0 ) * 100] ma 10.15 reg 34h:charge control 2 the default value : 45h bit description r / w d efault value 7 pre - charge timeout setting bit 1 00: 40 min ; 01: 50min ; rw 0 6 pre - charge timeout setting bit 0 10: 60mi n ; 11: 70min rw 1 5 reserved, can not be changed 4 chgled mode selection rw 0 0: constant on when charging 1: flashes when charging 3 - 2 reserved, can not be changed 1 - 0 constant current mode timeout setting bit 1 - 0 0 0: 6hours ; 01: 8hours ; rw 01 10: 10hours ; 11: 12hours 10.16 reg 35h:backup battery charge control the default value : 22h bit description r / w d efault value 7 backup battery charge enable control rw 0 0: disable ; 1: enable 6 - 5 backup battery voltage target setting rw 01 00: 3.1v ; 01: 3.0v ; 10: 3.6v ; 11: 2.5v 4 - 2 reserved, can not be changed 1 - 0 spare battery charging current is set 00: 50ua ; 01: 100ua ; 10: 200ua ; rw 10 11: 400ua 10.17 reg 36h: pek key parameter settings the default value : 9dh bit description r / w d efault value confidential page 35/45
AXP209 enhanced single cell li - battery and power system management ic 7 - 6 startup press time settings 00: 128ms ; 01: 3s ; 10: 1s ; 11: 2s. rw 01 5 - 4 long press time setting 00: 1s ; 01: 1.5s ; 10: 2s ; 11: 2.5s. rw 01 3 a utomatic shutdown on long press time exceeding the shutdown time rw 1 0: disable ; 1: enable 2 pwrok signal delay a fter power - up completed rw 1 0: 8ms ; 1: 64ms 1 - 0 shutd own time setting 00: 4s ; 01: 6s ; 10: 8s ; 11: 10s. rw 01 10.18 reg 37h: dc - dc operating frequency settings the default value : 08h bit description r / w d efault value 7 - 4 reserved, can not be changed 3 - 0 dc - dc switching frequency each level chang e s by 5% the default value 1.5mhz rw 1000 f = [1 +/ - (bit3 - 0 ) * 5%)] * 1.5mhz 10.19 reg 38h: v ltf - charge battery charging low temperature threshold settings the default value : a5h bit description r / w d efault value 7 - 0 battery under - temperatur e threshold setting when the battery is charging, m m*10h , when m=a5h, corresponding voltage is 2.112v rw a5h v oltage range 0v ~ 3.264v v ltf - charge = m * 10h * 0.0008v 10.20 reg 39h: v htf - charge battery charging high temperature threshold setting t he default value : 1fh bit description r / w d efault value 7 - 0 when charging the battery temperature threshold setting, n n*10h, when n=1fh, the corresponding voltage is 0.397v rw 1fh v oltage range 0v ~ 3.264v v htf - charge = n * 10h * 0.0008v 10.2 1 reg 3ah: system ipsout vwarning level1 the default value : 68h bit description r / w de fault value 7 - 0 system ipsout vwarning level1 rw 68h confidential page 36/45
AXP209 enhanced single cell li - battery and power system management ic 10.22 reg 3bh : system ipsout vwarning level2 the default value : 5fh bit description r / w d efault value 7 - 0 system ipsout vwarning level2 rw 5fh reg3ah , reg3bh voltage corresponding to the following relationship ( where the register value is n): vwarning = 2.8672 + 1.4mv * n * 4 10.23 reg 3ch: v ltf - discharge battery discharge under temperature threshold settings the default value : fch bit description r / w d efault value 7 - 0 rw fch battery under - temperature threshold setting when the battery is dischargin g , m m*10h , when m=fc, corresponding voltage is 3.226v ; voltage ranges from 0v~3.264 v ltf - discharge = m * 10h * 0.0008v 10.24 reg 3dh: v htf - discharge battery discharge over temperature threshold settings the default value : 16h bit descr iption r / w d efault value 7 - 0 rw 16h when discharging the battery under temperature threshold setting, n n*10h , when n=16h , corresponding voltage is 0.282v ; voltage ranges from 0v~3.264v v ltf - discharge = n * 10h * 0.0008v 10.25 reg 80h: dc - dc oper ating mode selection the default value : e0h bit description r / w d efault value 7 - 3 reserved, can not be changed 2 dc - dc2 control mode 0: pfm / pwm automatic switching rw 0 1 dc - dc3 control mode 1: fixed pwm rw 0 0 reserved, can not be changed 10.26 reg 82h: adc enable 1 the default value : 83h bit description r / w d efault value confidential page 37/45
AXP209 enhanced single cell li - battery and power system management ic 7 battery voltage adc enable 0: disable , 1: enable rw 1 6 battery current adc enable rw 0 5 acin voltage adc enable rw 0 4 acin current adc enable rw 0 3 vbus voltage adc enable rw 0 2 vbus current adc enable rw 0 1 aps voltage adc enable rw 1 0 ts pin adc function is enabled rw 1 10.27 reg 83h: adc enabl e 2 the default value : 80h bit description r / w d efault value 7 AXP209 internal temperature monitoring adc enable 0: disable , 1: enable rw 1 6 - 4 reserved, can not be changed 3 gpio0 adc function is enabled 0: disable , 1: enable rw 0 2 gpio1 adc f unction is enabled rw 0 1 - 0 reserved, can not be changed 10.28 reg 84h: adc sampling rate settings, ts pin control the default value : 32h bit description r / w d efault value 7 - 6 adc sampling rate settings 25 2 n rw 0 sampling rates is 2 5 , 50 , 100 , 200hz 5 - 4 ts pin output current setting : rw 11 00: 20ua ; 01: 40ua ; 10: 60ua ; 11: 80ua 3 reserved, can not be changed 2 ts pin function select rw 0 0: battery temperature monitoring function, 1: external independent adc 1 - 0 ts current output setting 00: disabled rw 1 01: output current only when charging rw 0 10: only when adc is s ampling input 11: always enabled 10.29 reg 85h: adc input range the default value : x0h confidential page 38/45
AXP209 enhanced single cell li - battery and power system management ic bit description r / w d efault value 7 - 2 reserved, can not be changed 1 gpio1 adc input range 0: 0 - 2.0475v rw 0 0 gpio0 adc input range 1: 0.7 - 2.7475v rw 0 10.30 reg 86h: gpio1 adc irq rising e dge threshold setting the default value : ffh bit description r / w d efault value 7 - 0 one lsb is 8mv rw ff 10.31 reg 87h: gpio1 adc irq falling edge of the threshold setting the default value : 00h bit description r / w d efault value 7 - 0 a lsb for 8m v rw 00 10.32 reg 8ah:timer control the default value : 00h bit description r / w d efault value 7 timer expire d rw 0 write 1 clear this state 6 - 0 set the time, in minutes rw 0000000 write all 0's to disable t his timer 10.33 reg 8bh: vbus pin monitoring and srp function control the default value : 00h bit description r / w d efault value 7 - 6 reserved, can not be changed 5 - 4 vbus valid voltage setting rw 00 00: 4.0v ; 01: 4.15v ; 10: 4.45v ; 11: 4.55v 3 vbus valid detection fea ture : 0: disable , 1: enable rw 0 2 vbus session detection feature: 0: disable, 1: enable rw 0 1 rw 0 discharge vbus discharge function setting 0: to disable the vbus discharge resistance ; 1: to enable the vbus discharge resistance confidential page 39/45
AXP209 enhanced single cell li - battery and power system management ic 0 rw 0 charge vbus charge function setting 0: disable the vbus charge resistance ; 1: enable the vbus charge resistance and charge the vbus 10.34 reg 8fh:over - temp erature shutdown feature set the default value : 21h bit description r / w d efault value 7 - 3 reserved, can not be changed rw 0 2 AXP209 internal over - temperature shutdown feature set rw 0 0: not shut down; 1: shutdown 1 - 0 reserved, can not be changed 10.35 reg 90h: gpio0 function set tings the default value : 07h bit description r / w d efault value 7 gpio0 rising edge irq or wakeup function 0 : disable rw 0 6 gpio0 falling edge irq or wakeup function 1 : enable rw 0 5 - 3 reserved, can not be c hanged rw 0 2 gpio0 pin feature set bit 2 - 0 000: output low rw 1 001: output high ( 3.3v ) 010: universal input function 1 rw 1 011: low noise ldo5 0 rw 1 100: adc input 1xx: floating 10.36 reg 91h: ld o5 output voltage and exten / gpio high level settings the default value : a5h bit description r / w d efault value 7 - 4 ldo5 the output voltage is set rw 1010 vout = [1.8 + (bit7 - 4 ) * 0.1] v ; default = 1.8 + 10 * 0.1 = 2.8v 3 reserved, can not be chan ged 2 - 0 exten and gpio [1: 0] output high level setting rw 101 000: 1.8v; 001: 2.5v; 010: 2.8v; 011: 3.0v; 100: 3.1v; 101: 3.3v; 110: 3.4v; 111: 3.5v confidential page 40/45
AXP209 enhanced single cell li - battery and power system management ic 10.37 reg 92h: gpio1 feature set ttings the default value : 07h bit description r / w d efault value 7 gpio1 rising edge irq or wakeup function 0 : disable rw 0 6 gpio1 rising edge irq or wakeup function 1 : enable rw 0 5 - 3 reserved, can not be change d rw 0 2 - 0 gpio1 pin feature set 000: output low rw 111 001: output high ( 3.3v ) 010: universal input function 011: low noise ldo 100: adc input 1xx: floating 10.38 reg 93h: gpio2 feature set the default value : 07h bi t description r / w d efault value 7 gpio2 rising edge irq or wakeup function 0 : disable rw 0 6 gpio2 falling edge irq or wakeup function 1 : enable rw 0 5 - 3 reserved, can not be changed rw 0 2 - 0 gpio2 pin feature set 000: output low rw 111 001: floating 010: universal input function xxx: floating 10.39 reg 94h: gpio [2: 0]setting and monitoring of signal status the default value : 00h bit description r / w the default value 7 reserved, can not be changed r 6 gpio2 input status 0: input l ow level r 5 gpio1 input status 1: input h igh level r 4 gpio0 input status r 3 - 0 reserved, can not be changed 10.40 reg 95h: gpio3 set tings the default value : 00h confidential page 41/45
AXP209 enhanced single cell li - b attery and power system management ic bit description r / w d efault value 7 gpio3 rising edge irq or wakeup function 0 : disable rw 0 6 gpio3 falling edge irq or wakeup function 1 : enable rw 0 5 - 3 reserved, can not be changed 2 gpio3 feature se t 0 : nmos open drain output rw 0 1 : digital input function 1 gpio3 output settings 0: output low, nmos turn on rw 1 1: float, nmos shut down 0 gpio3 input status 0: input high r 1: input low 10.41 reg 40h and 48h: irq enable 1 an d irq status 1 irq enable 1 , reg40h : default : d8h bit description r / w d efault value 7 acin over - voltage irq enable rw 1 6 acin connection irq enable rw 1 5 acin disconnection irq enable rw 0 4 vbus over - voltage irq enable rw 1 3 vbus connection irq enable rw 1 2 vbus disconnection irq enable rw 0 1 vbus available but less than v hold irq enable rw 0 0 reserved, can not be changed rw 0 irq state 1 , reg48h : default : 00h bit description r / w d efault value 7 - 0 rw 0 the description of each status bit re spectively matches each bit of 40h above ; for example: bit7 is acin over - voltage irq status bit 10.42 reg 41h and 49h: irq enable 2 and irq status 2 irq enable 2 , reg41h : default : ffh bit description r / w d efault value 7 battery connected ir q enable rw 1 6 battery is removed irq enable rw 1 5 battery in activation charge mode irq enable rw 1 4 e xit battery activation mode irq e nable rw 1 3 charging irq enable rw 1 2 charging complete irq enable rw 1 1 battery over - temperature irq enable rw 1 0 battery low temperature irq enable rw 1 confidential page 42/45
AXP209 enhanced single cell li - battery and power system management ic irq state 2 , reg49h : default : 00h bit description r / w the default value 7 - 0 meaning of the stat us bits correspond to each bit of 41h listed above rw 0 10.43 reg 42h and 4ah: irq enable 3 and irq status 3 irq enable 3 , reg42h : default : 03h bit description r / w d efault value 7 AXP209 internal over - temperature irq enable rw 0 6 charging current is less than the set current irq enable rw 0 5 reserved, can not be changed 4 dc - dc2 the output voltage is less than the set value irq enable rw 0 3 dc - dc3 the output voltage is less than the set value irq enable rw 0 2 ldo3 the output voltage is les s than the set value irq enable 1 pek short press irq enable rw 1 0 pek long press irq enable rw 1 irq state 3 , reg4ah : default : 00h bit description r / w d efault value 7 - 0 meaning of the status bits correspond to each bit of 42h above rw 0 10.4 4 reg 43h and 4bh: irq enable 4 and irq status 4 irq enable 4 , reg43h : default : 01h bit description r / w d efault value 7 n_oe startup irq enable rw 0 6 n_oe shutdown irq enable rw 0 5 vbus valid irq enable rw 0 4 vbus invalid irq enable rw 0 3 vbus session a / b irq enable rw 0 2 vbus session end irq enable rw 0 1 aps low voltage irq enable ( level1 ) rw 0 0 aps low voltage irq enable ( level2 ) rw 1 irq state 4 , reg4bh : default : 00h bit description r / w d efault value 7 - 0 meaning of the status bi ts correspond to each bit of 43h above rw 0 10.45 reg 44h and 4c: irq enable 5 and irq status 5 irq enable 5 , reg44h the default value : 00h ; confidential page 43/45
AXP209 enhanced single cell li - battery and power system management ic bit descripti on r / w d efault value 7 timer expires irq enable rw 0 6 pek button on the rising edge irq enable rw 0 5 pek button on the falling edge irq enable rw 0 4 reserved, can not be changed rw 0 3 gpio3 edge trigger input irq enable rw 0 2 gpio2 edge trigge r input irq enable rw 0 1 gpio1 input edge - trigger or adc input irq enable rw 0 0 gpio0 edge trigger input irq enable rw 0 irq state 5 , reg4ch : default : 00h bit description r / w d efault value 7 - 0 meaning of the status bits correspond s to each bit 44 h above rw 0 note: writing 1 to all irq status register bits will clear corresponding status. 10.51 reg b8h:coulomb counter c ontrol the default value : 00h bit description r / w d efault value 7 coulomb gauge enable/disable rw 0 6 coulomb counter su spend control. writing 1 to this bit will suspend the coulomb counter, and this bit will be automatically cleared to 0 as well rw 0 5 coulomb counter clear control. writing 1 to this bit will clear the coulomb counter, and this bit will automatically be cleared to 0. rw 0 4 - 2 reserved, can not be changed rw 0 1 - 0 decrypt the start bit. automatically clear to 0 after the decryption. rw 0 0 decryption is complete : rw 0 0 : not finished 1 : finished 10.52 reg b9h: fuel gauge the default value : 7fh bit description r / w d efault value 7 fuel gauge control rw 0 0 : normal operating mode 1 : suspended 6 - 0 fuel gauge percentage r 7f confidential page 44/45
AXP209 enhanced single cell li - battery and power system management ic 11. package AXP209 : qfn48 ? 2010 x - powers limited - all rights reserved x - powers can not assume responsibility for use of any circuitry othe r than circuitry entirely embodied in a x - powers product. no circuit patent licenses , copyrights , or other intellectual property rights are implied. x - powers reserves the right to make changes to the specifications and products at any time without notice. confidential page 45/45

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