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INTEGRATED CIRCUITS
DATA SHEET
SAA1501T Battery charge level indicator
Objective specification File under Integrated Circuits, IC11 December 1994
Philips Semiconductors
Philips Semiconductors
Objective specification
Battery charge level indicator
FEATURES * High level of integration to allow assembly in intelligent battery packs * Accurate charge and discharge account * Large dynamic range of charge and discharge currents * Independent settings of charge and discharge efficiency * 2 V minimum supply voltage (2 cell operation) * Temperature protection of batteries during charging * Temperature controlled self-discharge * Accurate charge current regulation * Two charge amount display modes, LCD and LED. GENERAL DESCRIPTION
SAA1501T
The SAA1501T is intended to be used as a battery monitor and charge current control circuit in rechargeable battery systems. The SAA1501T is processed in BiCMOS technology where the benefits of mixed bipolar and CMOS technology is fully utilized to achieve high accuracy measurements and digital signal processing in the same device. The general function of the integrated circuit is a Coulomb counter. During battery charging, the charge current and charge time are registered in a Coulomb counter. During discharge, the discharge current and time are recorded. The momentary charge amount of the batteries can be displayed either on an LCD screen or on an LED bargraph. Using the SAA1501T, intelligent batteries or intelligent battery powered systems can be easily designed with only a few external components.
QUICK REFERENCE DATA SYMBOL VCC ICC ICCstb fosc Vi(s) Tamb PARAMETER supply voltage supply current supply current in standby mode fixed oscillator frequency input sense voltage (pins 9 and 10) operating ambient temperature VCC = 3 V; Ic = Id = 60 A VCC = 3 V; VCSI = VDSI = 0 V Cosc = 820 pF; Rref = 51.5 k CONDITIONS - - - 0 0 MIN. 2.0 TYP. 3.0 1.2 - 4.2 - - MAX. 4.3 1.7 100 - UNIT V mA A kHz
VCC - 1.6 V +70 C
ORDERING INFORMATION PACKAGE TYPE NUMBER NAME SAA1501T SO24 DESCRIPTION plastic small outline package; 24 leads; body width 7.5 mm VERSION SOT137-1
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December 1994 BLOCK DIAGRAM Philips Semiconductors
Battery charge level indicator
3 Objective specification
SAA1501T
Fig.1 Block diagram.
Philips Semiconductors
Objective specification
Battery charge level indicator
PINNING SYMBOL VCC EN Ccy CCC Ich Rref RDCC RCCC CSI DSI RTEMP1 RTEMP2 Cosc BUZ FULL L100 L80 L60 L40 L20 BP BLI POL GND PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 DESCRIPTION supply voltage enable output duty cycle capacitor output charge counter capacitor output maximum average charge current setting input current reference resistor input discharge current conversion resistor input charge current conversion resistor input charge sense input discharge sense input temperature sensing resistor 1 input temperature sensing resistor 2 input oscillator capacitor input buzzer output battery full indication output 100% segment indication output 80% segment indication output 60% segment indication output 40% segment indication output 20% segment indication output LCD back plane drive battery low indicator LED output power-on LED output power ground
SAA1501T
Fig.2 Pin configuration.
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Philips Semiconductors
Objective specification
Battery charge level indicator
FUNCTIONAL DESCRIPTION The most important function of the SAA1501T is the charge account in rechargeable battery systems. Both NiCd and NiMH batteries in all sizes can be used. The system can operate alone as a charge monitor with a charge amount display function or, can operate in conjunction with a charger. If the SAA1501T operates together with a charger, it delivers a control signal at output EN, for charge current regulation or for battery voltage regulation. Fast charging systems and charge current regulation The SAA1501T is especially designed to be used in fast charging systems. In fast charging systems, the charge time is lowered by raising the charge current. Signal EN controls the charger current. The counters register the state of charge of the batteries and at the 80% level the charge current is reduced via a smaller duty cycle regulation of signal EN. The second (slow) level fully charges the batteries which is not possible with the first (fast) level. After the slow charge mode the counter switches over to an even smaller duty cycle of EN and thus enters the third (trickle) charge mode, to overcome the self-discharge of the batteries. Current sensing and charge account The charge current is sensed by means of a very low resistance (e.g. 70 m) sense resistor Rsc (see Fig.8) to save power at high charge rates. Via the V/I charge converter and external resistor RCCC (see Fig.8), the sensed voltage is converted into a charge current Ic (the same is applicable for the discharge current). In the I/F converter the charge current is converted into a frequency for up-counting the counter. For the discharge current (Id) the converted frequency is used for down-counting. The up and down counting is registered in counters CNT1 and CNT2, depending on the actual charge and discharge current levels of the batteries. This is called dynamic charge account. Charge display The charge amount represented by the Coulomb counter can be displayed via an LCD screen or via an LED bargraph. If the charge amount is reduced to 0%, the battery low indicator (BLI) LED is turned on at the end of a battery discharge session. A flashing BLI, in combination with a repeating buzzer alarm, informs the user about the low charge state. A new charge session should then be started. Protections
SAA1501T
In the temperature control block, the absolute temperature is used as a protection to end the fast charge cycle. Fast charging at high temperature is not permitted because of degradation of the battery cells. If the batteries are disconnected, an open-battery condition is recognized and the SAA1501T enters the standby mode. Mode detection The mode detector detects whether there are any charge or discharge currents, whether the system is powered, whether loads are connected or whether the system is in the standby mode. If power is connected, the power-on LED (POL) is on. In the standby mode, the Coulomb counter will count down in accordance with the self-discharge speed of the batteries, which is temperature controlled. The following subsections describe the various blocks of the block diagram in more detail. Supply and reference During the period when VCC rises from 0 V to the internal reset level, all counters are reset. The internal reset is released before VCC reaches 1.7 V. The operating supply voltage ranges from 2 V to the open battery level of 4.3 V (min). The characteristics are guaranteed at VCC = 3 V. In order to protect the SAA1501T against high supply voltages during open battery in a flyback converter, a voltage clamp circuit is made active at 6.35 V (typ). The clamping current must not exceed 80 mA. A band gap reference block is included to generate accurate voltages i.e. for the oscillator. Moreover, together with Rref, accurate currents are generated which are used in the I/F and V/I converters and the oscillator block. In the standby mode only the oscillator and the digital parts are active to limit the discharge current of the batteries to a current level of less than 100 mA. The circuits that are needed temporarily are switched on and off during standby (see "Timing characteristics" tsom). Voltage-to-current charge and discharge In the V/I converter, the input charge current is translated into acceptable levels for the circuit. The conversion formula is: ( I ch arg e x R sc ) I c = -------------------------------------- ; where RCCC > Rsc (see Fig.7) R CCC
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Philips Semiconductors
Objective specification
Battery charge level indicator
With RCCC, the charge efficiency can be manipulated depending on the charge level. The restriction of the SAA1501T is a maximum average charge current of 60 A and a minimum momentary charge current of 0.6 A. The same formula is applicable for the discharge current. The discharge efficiency can now also be changed by RDCC depending on the discharge current levels, but independent of the charge current. As both sense levels are referenced to ground, the sensing elements could be combined into one. The outputs are used combined as 1 x (I - I ) in the I/F converter and combined as (I - I ) 6 c d c d in the pulse width modulator block and made separately available in the mode detector. The conversion is made lower by a factor of 6 in the I/F converter block, thereby enabling the use of poor leakage capacitors on pin 4. All V/I converter pins are sensitive to capacitive loading (Cout x Rconv < 1 ms), the conversion resistors should be mounted as close as possible to the output pins. I/F converter This block produces up-counts while charging and down-counts while discharging. The I/F converter translates the charge/discharge currents into a frequency. This frequency is determined by ( I c ( d ) x R sense x 6 ) f = ----------------------------------------------------------------------------------( C CC x V osc x R CCC ( RDCC ) ) During the time period `t', the charge current, expressed as a `Charge Parcel', will be counted in the Coulomb counters (CNT1 and CNT2). During discharge the `Charge Parcel' is the product of the discharge current and the `t' from the I/F converter generated frequency. The momentary contents of the Coulomb counter is a multiple of the `Charge Parcels'. Coulomb counters CNT1 and CNT2 The SAA1501T has been designed for average maximum charge and discharge current levels of 5 C and minimum charge and discharge current levels of 0.05 C. This means that counter CNT1 will be full, or empty, after a minimum time period of 12 minutes at maximum charge and discharge currents at the recommended oscillator frequency. Higher charge and discharge rates than 5 C are possible, but only by changing the oscillator frequency. It should be noted that the self-discharge time and the display functions are influenced by a higher oscillator frequency. The SAA1501T enables top-up charging in order to account for the decrease of charge efficiency at high charge rates. The SAA1501T switches to the slow charge mode at full recognition when CNT1 is at its maximum. As soon as the batteries are completely full (when CNT2 is at its maximum), the SAA1501T switches December 1994 6
SAA1501T
to the trickle charge mode to overcome the self-discharge of the batteries. The top-up charge volume of CNT2 = 0.2 x CNT1 = 0.2 C (where Q is rated as Ampere hours of the battery). The slow and trickle charge current levels are dependent on the k-factor. Signal EN controls the external charger e.g. TEA1400 (see Fig.8). When an LED bargraph display is used, the LED currents are also considered as a battery discharge current, and therefore influence the duty cycle of the charge current regulation signal EN. The SAA1501T also enables temperature protection. In the event that the battery temperature exceeds a certain maximum temperature level (Tbattery > Tmax), which can be set by an external NTC resistor, the SAA1501T switches to the slow charge mode. In the standby mode (self-discharge mode), which is recognized by the SAA1501T in the mode detector when both the charge and discharge currents are zero (Ic = Id = 0), the self-discharge of the batteries is registered by counting down in 200 days (based on fosc = 4 kHz) if Tbattery < Tself or in 100 days (based on fosc = 4 kHz) if Tbattery > Tself. Tself is also set by means of an external NTC resistor. Band gap generation From the band gap voltage block, two reference voltages are derived Vref and Vmax. Voltage Vref at pin Rref sets the reference currents, Iref1 (I/F converter); Iref2 (mode detector) and Iref3 (oscillator). Voltage Vmax sets the current Imax which is used in the pulse width modulation block to accurately control the charge current. Charge current regulation While charging, the SAA1501T produces a charge current regulation signal EN in the pulse width modulation block which is used for controlling an external charger. This digital signal EN is derived from the signal produced at pin Ccy. The duty cycle is determined by k x I max = ------------------Ic - Id in which the value of k depends on the state of the counters CNT1 and CNT2: CNT1 is not full; k = 1 (fast charging). CNT1 is full; CNT2 is not full; k = 0.1 (slow charging). CNT1 and CNT2 are full; k = 0.025 (trickle charging).
Philips Semiconductors
Objective specification
Battery charge level indicator
Mode detector This block differentiates between the available modes of operation. The modes are given below: Charge mode; power charge (POCH). Discharge mode; battery load (BATLD). Power load mode (POLD); the batteries are charged while the load is also active. Self discharge mode; (STANDBY). To detect power in a regulated system (see Fig.8) the EN signal is used for sensing. The POCH mode is recognized when the converted charge current Ic > Iref2 (when in the power mode, change of mode can only be recognised if EN is HIGH). The BATLD mode is recognized when Id > Iref2; the POLD mode is recognized when Ic > Iref2 and Id > Iref2; the standby mode is recognized when Ic < Iref2 and Id < Iref2. In the standby mode, if the advised frequency (4 kHz) is applied, it takes 0.5 s to determine another mode (in all other modes, a change of mode is sensed continuously). In all other modes an eventual change of mode is done continuously. To save supply current during standby, the V/I converters are switched off. With the specific fixed intervals, the SAA1501T checks whether power or load is connected again. This checking is synchronized by the sensing signal of the V/I converters. The SAA1501T can handle a DC charge current as well as a discontinuous charge current (SMSP charger). The load current can also be DC or interrupted, e.g. produced by a motor. The digital filtering of both signals, to overcome faulty mode detections, restricts the conditions in which power and load are recognized. Because of the very sensitive input detection level of the mode detector for a charge current (power) in combination with the high interference levels of motor driving, the detection level for power (Ic > Iref2) is raised by a factor of 25 when the batteries are loaded. Oscillator As the oscillator has to operate in all modes, including the standby mode, the current consumption of the oscillator must be very low. The same applies for the band gap generator block, because the band gap delivers accurate reference voltages and currents to the oscillator block. Apart from the low current consumption, the accuracy of the period time is important. The period time of the oscillator is: ( VH - VL) t osc = 2 x C osc x -------------------------- = 5.6 x C osc x R ref I ref3 Prescaler/controller
SAA1501T
In the prescaler, a new system clock is created (CLK) which is used for all timing blocks. Many frequencies are derived from the basic oscillator at the standard frequency of 4 kHz (1/Tosc), such as the self-discharge times and the modulation frequency for the buzzer, the drive voltage frequency for the LCD screen and the pulse trains for temperature measurements and power/load sensing measurements in the mode detector. Temperature In the temperature control block two temperature measurements are performed. In order to switch off fast charging when the battery temperature exceeds an adjustable maximum temperature (Tmax), a maximum temperature measurement is performed. A second temperature measurement is performed in the standby mode. This temperature measurement is input to the temperature control block to switch over the self-discharge rate from a count down of 200 days (based on fosc = 4 kHz) if Tbattery < Tself, to a count down rate of 100 days (based on fosc = 4 kHz) if Tbattery > Tself. In all modes the temperature is measured periodical. The temperature circuit which controls the above mentioned functions is a bridge configuration synthesis, as illustrated in Fig.3.
Fig.3 Temperature circuit.
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Philips Semiconductors
Objective specification
Battery charge level indicator
Display decoder driver The counters are used to output the battery charge amount via a decoder and driver stage to the display outputs L100, L80, L60, L40 and L20 to drive an LCD screen or an LED bargraph. A 64 Hz (based on fosc = 4 kHz) block signal at output BP (back plane) must be connected to the back plane of the LCD bar. If pin BP is connected to ground, the display outputs L20 to L100 will produce signals for an LED bargraph. Output signal POL (power-on LED) indicates when the batteries are in the charge mode. When the counter is not at its maximum state, POL is on and flickers at 2 Hz (based on fosc = 4 kHz) when the counter is at its maximum. The waveforms illustrated in Fig.4 depict operation of the monitor display. The outputs BLI (battery low indication), BUZ (buzzer) and FULL indicate the extreme status (empty or full) of the counters and the batteries. The waveforms of the signals BLI and BUZ if one switches over from BATLD to standby when BLI is active, are given in Fig.4.
SAA1501T
The BLI sequence is as follows. If during discharge the charge state falls below 0%, the red BLI LED is turned on. Changing mode from discharge to standby means that the BLI LED and the buzzer (BUZ) are activated as indicated in Fig.4. If after a 0% passing recharge is activated, the red BLI LED is turned on again for as long as the counter remains below 10%. Switch-over in the 0 to 10% range to standby will activate BLI and BUZ again. The LEDs of the LED bargraph are activated as a result of each operational mode change, starting with a step-up pattern. Step-up means that LEDs are activated successively one after the other, in accordance with the charge status each 18 s (based on fosc = 4 kHz). After the step-up, the LEDs will be on for 8 s (based on fosc = 4 kHz), except for the POCH mode, where the LEDs will be on continuously to inform the user about the charge state of the batteries. The LCD display is, apart from the LED mode, always visible. Figure 5 shows the legend for Fig.6. Figure 6 shows the operation of the monitor display.
BUZ
Fig.4 BLI and buzzer timing.
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Philips Semiconductors
Objective specification
Battery charge level indicator
Open battery protection Open battery protection is active when VCC = 4.5 V (typ.). The SAA1501T will then react as if the system is in the standby mode. This means that the LEDs are turned off in the LED mode, in the LCD mode the flickering is stopped and the enable pin (EN) is switched to floating. Testing A user test facility is built-in for checking if the LCD and/or LED displays are mounted correctly. Pin RCCC is used as
SAA1501T
a test pin. Raising the voltage above 1 V during the set-up time will activate the test. The test mode can only be started in the standby mode. In the test mode all counters are reset and will be active successively in the sequence BLI, L20, L40, L60, L80, L100 and FULL with an interval period determined by Tosc. The test mode can be exited via the following methods: Power-on; the Coulomb counter retains the latest data displayed. Automatically after the test cycle time; the Coulomb counter is reset.
Fig.5 Legend for Fig.6.
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Philips Semiconductors
Objective specification
Battery charge level indicator
SAA1501T
Fig.6 Charge state of counter shown by LCD or LED display.
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Philips Semiconductors
Objective specification
Battery charge level indicator
SAA1501T
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). All voltages with respect to GND (pin 24); input currents are positive; pins 5, 6 and 21 are not allowed to be voltage driven; the voltage ratings are valid provided other ratings are not being violated. SYMBOL VCC Vn1 Vn2 V ICC IGND In Ptot Tstg Tj Tamb PARAMETER supply voltage input voltage at pins 9 to 12 input voltage at pins 2 to 4, 13 to 20, 22 and 23 voltage difference between pins 10 and 7 and between pins 9 and 8 supply current power ground supply current supply current at pins 5 to 8 total power dissipation storage temperature junction temperature operating ambient temperature Tamb = 70 C CONDITIONS MIN. -0.5 -0.5 -0.5 -2.0 - - - - -55 - -10 MAX. +5.5 +1.0 VCC +2.0 80 -80 -1 0.75 +150 +150 +75 V V V V mA mA mA W C C C UNIT
QUALITY SPECIFICATION In accordance with SNW-FQ-611 part E. The numbers of the quality specification can be found in the "Quality Reference Handbook". The Handbook can be ordered using the code 9398 510 63011. THERMAL CHARACTERISTICS SYMBOL Rth j-a PARAMETER thermal resistance from junction to ambient in free air VALUE 75 UNIT K/W
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Philips Semiconductors
Objective specification
Battery charge level indicator
SAA1501T
CHARACTERISTICS VCC = 3 V; Tamb = 25 C; Rref = 51.5 k (0.1%); Cosc = 820 pF (0.1%); RCCC = RDCC = 3.65 k (0.1%); Rmax = 3.48 k (0.1%); Iref = Vref/Rref; Imax = Vmax/Rmax; the minimum and maximum values are 4 sigma limits; unless otherwise specified. SYMBOL Supply VCC VCC(ir) ICC ICCstb Vref Iref Vmax TC Vclamp I4 supply voltage supply voltage internal reset supply current supply current in standby mode reference voltage reference current maximum voltage temperature coefficient of reference voltage clamping level voltage Ic = Id = 60 A VCSI = VDSI = 0 V note 2 notes 1 and 2 note 2 T = 0 to 100 C ICC = 50 mA V9 = 7 mV; V4 = 1.5 V V10 = 7 mV; V4 = 1.5 V V9 = 200 mV; V4 = 1.5 V V10 = 200 mV; V4 = 1.5 V I3 voltage-to-current charge/discharge current accuracy V9 = 7 mV; Rmax = 400 k; k = 0.025 V10 = 7 mV; Rmax = 400 k; k = 0.025 V9 = 200 mV; Rmax = 400 k; k = 0.025 V10 = 200 mV; Rmax = 400 k; k = 0.025 I4/I3 relative current accuracy of voltage-to-current in charge counter capacitor input sense voltage at pins 9 and 10 DC output sense current (pins 8 and 7) offset voltage V9 = V10 = 200 mV note 1 2.0 - 0.6 - 204 3.5 204 0 5.8 -259 262 -8.93 8.93 -1.55 1.57 -53.5 53.5 - 3.0 1.2 - - 211 - 211 25 x 6.3 -324 328 -9.13 9.13 -1.94 1.97 -54.7 54.7 1.0 10-6 4.3 1.7 1.7 100 217 8 217 100 x 6.8 -389 394 -9.32 9.32 -2.32 2.36 -56 56 2.5 10-6 V V mA mA mV A mV C V PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Voltage-to-current charge/discharge voltage-to-current charge/discharge current accuracy nA nA A A A A A A %
Vi(s) Io(s) Vos
VCC(max) = 3.7 V; note 1 3.7 < VCC < 4.4 V; note 1
0 - 0.6 -
- - - -
VCC - 1.6 2.1 60 1.8
V V A mV
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Philips Semiconductors
Objective specification
Battery charge level indicator
SAA1501T
SYMBOL I/F converter a
PARAMETER
CONDITIONS Iref1 = a x Iref (where a is constant); V4 = 1.26 V; idle mode Ic = 0; Id = 60 A; I4 = 10 A
MIN.
TYP.
MAX.
UNIT
multiplication factor for Iref1 clamping voltage (pin 4) HIGH level reference voltage (pin 4) LOW level reference voltage (pin 4)
2.35
2.5
2.65
Vclamp VCCC(H) VCCC(L)
0.7 1.58 1.26
0.9 1.66 1.33
1.1 1.74 1.4
V V V
Pulse width modulator ACC Imax Id/Imax accuracy for Imax at Ccy maximum DC current k factor 15 < Imax < 60 A Imax = Vmax/Rmax; note 1 k = 1; Vd = 1.5 V; idle mode k = 0.1; Vd = 1.5 V; idle mode k = 0.025; Vd = 1.5 V; idle mode VCCY VCCY start up-clamping voltage (pin 3) clamping voltage (pin 3) Id = 10 A; Ic = 0 open-circuit at pin 3; pin 5 = VCC; (Ic - Id) = 60 A - 0.6 0.95 0.094 0.023 0.7 - - - 0.98 0.099 0.025 0.9 - 3 60 1.01 0.104 0.027 1.1 VCC - 0.6 V V % mA
VCCY(H) VCCY(L) IZ Iref2 Iref4
HIGH level switching voltage LOW level switching voltage 3-state enable current V2 = 1.5 V Iref2 e x Iref (where e is constant)
1.60 1.28 - -
1.77 1.32 -
1.86 1.37 1 - -
V V A
Mode detector mode detection level at pins 7 and 8 mode detection level at pin 7 0.15Iref 25Iref2
Iref4 Iref2; - in modes POLD and BATLD Iref1(sink) x Tclk Iref1(source) x Tclk
Oscillator (pin 13) Qc Qd Q charge amount discharge amount difference between charge and discharge charge amount multiplication factor for Iref3 voltage swing HIGH-to-LOW transition Iref3 = b x Iref (where b is constant) 142 142 0.95 150 150 1.0 158 158 1.05 nC nC
b Vosc
- -
0.75 440
- - mV
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Philips Semiconductors
Objective specification
Battery charge level indicator
SAA1501T
SYMBOL fosc Vi
PARAMETER oscillator frequency
CONDITIONS
MIN. 3.9
TYP. 4.3 - 10.0 16 0.54
MAX. 4.7
UNIT kHz
Temperature control (pins 11 and 12) input voltage V11 = V12 = 300 mV V11 = V12 = 300 mV ITEMP1 = c x Iref (where c is constant); VTEMP1 = VTEMP2 = 300 mV ITEMP2 = d x Iref (where d is constant); VTEMP1 = VTEMP2 = 300 mV 0 9.7 15 0.45 900 10.3 17 0.63 mV ITEMP2/ITEMP1 detection at Tmax ITEMP2/ITEMP1 detection at Tself c multiplication factor for ITEMP1 multiplication factor for ITEMP2
d
4.5
5.4
6.3
Open battery protection VCC(ob) Testing Vtest IOL1 test level voltage 1.0 - 2.0 V open-battery level voltage 4.3 4.5 4.65 V
Display decoder driver LOW level output current (pin 20 LED), (LED 20 is on) output LED sense current (pin 21 LED), (LED 20 is on) LED current compensation factor LOW level output current (pins 20 to 16 LED), (all LEDs are on) total output sense current (pins 21) LED current compensation factor output current (pins 20 to 16 LCD) LOW level output current (pins 14 and 15) LOW level output current (pins 22 and 23 LED) LOW level output current (pin 21 LCD) HIGH level output current (pins 20 to 16 LED) HIGH level output current (pin 21 LED) VOL = 0.6 V; L40 to L100 off; 7 VCC = 2.4 V VOBP = 0.1 V; L40 to L100 off; VCC = 2.4 V IOL1/IOBP; VCC = 2.4 V all LEDs on; VOL = 0.7 V; VCC = 2.8 V VOBP = 0.1 V; VCC = 2.8 V; L20 to L100 on 5IOL2/IOBP(tot) VOL = 0.5 V; VCC = 2.8 V VOL = 0.4 V; VCC = 2.4 V VOL = 0.4 V; VCC = 2.1 V VOL = 0.4 V; VCC = 2.8 V VOH = 2.4 V; VCC = 2.8 V VOH = 2.4 V; VCC = 2.8 V 63 10 12 mA
IOBP
82
100
A
ILED(CF) IOL2
110 7.5
121 11
132 14 mA
IOBP(tot) ILED(CF) IOL IOL(14,15) IOL(22,23) IOL(21) IOH IOH(21)
350 115 350 0.9 7 572 261 239
452 125 480 1.2 10 849 378 378
560 135 640 1.7 12 1214 526 565
A
A mA mA A A A
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Philips Semiconductors
Objective specification
Battery charge level indicator
SAA1501T
SYMBOL VOH(14) IOH(15) IOH(22,23) ILO Notes
PARAMETER HIGH level output current (pin 14) HIGH level output current (pin 15) HIGH level output current (pins 22 and 23) output leakage current (pin 21)
CONDITIONS VOH = 2 V; VCC = 2.4 V VOH = 2 V; VCC = 2.4 V VOH = 2.4 V; VCC = 2.4 V VOH = 0 to VCC
MIN. 0.7 0.99 260 -
TYP. 1.6 1.67 450 -
MAX. 2.5 2.69 708 1
UNIT A mA A A
1. Not measured by the industrial measuring program, but guaranteed by design. 2. Internally detected from band gap generator.
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Philips Semiconductors
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Battery charge level indicator
TIMING CHARACTERISTICS SYMBOL Tosc Tclk tsom tsom(p) trec tself PARAMETER oscillator cycle time clock cycle time sense operation mode time sense operation mode period time recognition time self discharge counter time note 2 note 2 power; note 3 load; note 4 Tbattery > Tself (100 days at fosc = 4 kHz) Tbattery > Tself (200 days at fosc = 4 kHz) tbattery(s) tbattery(p) tsu tid tpd tsu:LED tLED(ON) fBP fBUZ Notes 1. V osc t osc = 2C osc x ----------- ; where Vosc = 440 mV and Iref3 = 0.75. I ref3 battery temperature measurement sense time battery temperature measurement period time display test set-up time interval display test time period display test time LED set-up time LEDs-on time drive voltage frequency for back plane modulation frequency for auto buzzer after change of mode (except POCH mode) note 1 CONDITIONS 64tosc 1.5 x 27Tosc 212Tosc >32tosc >20tosc 235Tosc 236Tosc 27Tosc 216Tosc
SAA1501T
VALUE Tosc = 2Cosc x Vosc/Iref3
211Tosc < t < 1.5 x 218Tosc 210Tosc 1.5 x 218Tosc 29Tosc 215Tosc 2-4Tosc
1 2Tosc
2. Applies to all converters and enable signal. 3. For charge current AC or DC: f > 12fosc. 4. For discharge current AC: f > 14fosc.
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Philips Semiconductors
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Battery charge level indicator
APPLICATION INFORMATION
SAA1501T
Fig.7 Battery pack application diagram; with camcorder.
Fig.8 State-of-charge indicator and charge current regulation.
December 1994
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Philips Semiconductors
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Battery charge level indicator
PACKAGE OUTLINE
SAA1501T
handbook, full pagewidth
15.6 15.2
7.6 7.4
A
S 0.9 (4x) 0.4
0.1 S
10.65 10.00
24
13 2.45 2.25 1.1 1.0 0.3 0.1 0.32 0.23 2.65 2.35
pin 1 index 1 12 detail A 1.1 0.5 0 to 8o
MBC235 - 1
1.27
0.49 0.36
0.25 M (24x)
Dimensions in mm.
Fig.9 Plastic small outline package; 24 leads; body width 7.5 mm (SO24; SOT137-1).
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Philips Semiconductors
Objective specification
Battery charge level indicator
SOLDERING Plastic small-outline packages BY WAVE During placement and before soldering, the component must be fixed with a droplet of adhesive. After curing the adhesive, the component can be soldered. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. Maximum permissible solder temperature is 260 C, and maximum duration of package immersion in solder bath is 10 s, if allowed to cool to less than 150 C within 6 s. Typical dwell time is 4 s at 250 C. A modified wave soldering technique is recommended using two solder waves (dual-wave), in which a turbulent wave with high upward pressure is followed by a smooth laminar wave. Using a mildly-activated flux eliminates the need for removal of corrosive residues in most applications. BY SOLDER PASTE REFLOW Reflow soldering requires the solder paste (a suspension of fine solder particles, flux and binding agent) to be DEFINITIONS Data sheet status Objective specification Preliminary specification Product specification Limiting values
SAA1501T
applied to the substrate by screen printing, stencilling or pressure-syringe dispensing before device placement. Several techniques exist for reflowing; for example, thermal conduction by heated belt, infrared, and vapour-phase reflow. Dwell times vary between 50 and 300 s according to method. Typical reflow temperatures range from 215 to 250 C. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 min at 45 C. REPAIRING SOLDERED JOINTS (BY HAND-HELD SOLDERING
IRON OR PULSE-HEATED SOLDER TOOL)
Fix the component by first soldering two, diagonally opposite, end pins. Apply the heating tool to the flat part of the pin only. Contact time must be limited to 10 s at up to 300 C. When using proper tools, all other pins can be soldered in one operation within 2 to 5 s at between 270 and 320 C. (Pulse-heated soldering is not recommended for SO packages.) For pulse-heated solder tool (resistance) soldering of VSO packages, solder is applied to the substrate by dipping or by an extra thick tin/lead plating before package placement.
This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.
December 1994
19
Philips Semiconductors - a worldwide company
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For all other countries apply to: Philips Semiconductors, International Marketing and Sales, Building BE-p, P.O. Box 218, 5600 MD, EINDHOVEN, The Netherlands, Telex 35000 phtcnl, Fax. +31-40-724825 SCD35 (c) Philips Electronics N.V. 1994
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Printed in The Netherlands
373061/1500/01/pp20 Document order number: Date of release: December 1994 9397 743 50011
Philips Semiconductors

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