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| january 2009 rev 1 1/21 21 stc3100 battery monitor ic with coulomb counter/gas gauge features battery voltage monitoring internal temperature sensor coulomb counter with 12/14-bit ad converter, +/- 80 mv input voltage range internal or external 32768 hz time base i2c interface for gas gauge monitoring and device control 32-ram bytes 8-byte unique device id one general-purpose i/o applications cellular phones, pda, mp3 players, cordless phones digital cameras, usb appliances, bluetooth devices description the stc3100 monitors the critical parameters of a single-cell li-ion battery (voltage, temperature and current) and includes hardware functions to implement a gas gauge for battery charge monitoring, based on a programmable 12- to 14-bit a/d converter. with a typical 30 milliohms external sense resistor, the battery current can be up to 2.5 a and the accumulator system provides a capacity up to +/-7000 mah with a resolution of 0.2 mah. the device is programmable through the i2c interface. miniso-8 (plastic micropackage) dfn8 3x3 (plastic micropackage) 1 2 3 4 5 6 7 8 io0 sda scl gnd vin rosc vcc cg pin connections (top view) www.st.com
block diagram stc3100 2/21 1 block diagram figure 1. stc3100 internal block diagram ad converter 12 / 14 b it s ( s igned) acc u m u l a tor s a nd control regi s ter s i2c interf a ce vin gnd s da s cl vcc gener a l-p u rpo s e i/o line cg 3 2 khz time bas e 1.2 v reference io0 ad converter 11 b it s ( u n s igned) temp s en s or ram & id regi s ter s mux o s cill a tor ro s c cg+ cg- am00830 stc3100 pin assignment 3/21 2 pin assignment note: i: input o: output od: open drain a: analog d: digital table 1. stc3100 pin description pin # pin name type function 1 io0 i/od general-purpose i/o 2rosc i_ad oscillator bias resistor or external 32 khz clock for gas gauge 3 sda i/od i2c serial data 4 scl i_d i2c serial clock 5 gnd ground analog and digital ground 6 cg i_a gas gauge current sense input 7 vcc supply power supply 8 vin i_a battery voltage sense input absolute maximum ratings and operating conditions stc3100 4/21 3 absolute maximum ratings and operating conditions table 2. absolute maximum ratings symbol parameter value unit vmax maximum voltage on any pin 7 v vio voltage on i/o pins -0.3 to 7 v tstg storage temperature -55 to 150 c tj maximum junction temperature 150 c esd electrostatic discharge (hbm human body model) 2 kv table 3. operating conditions symbol parameter value unit vcc operating supply voltage on v cc 2.7 to 5.5 v vin input voltage on vin 0 to vcc v vmin minimum voltage on v cc for ram content retention 2.0 v toper operating free air temperature range -40 to 85 c stc3100 electrical characteristics 5/21 4 electrical characteristics table 4. electrical characteristics (2.7 v < v cc < 4.5 v, -20 c to 70 c) symbol parameter conditions min typ max units supply i cc operating current consumption average value over 4s 100 ua istby current consumption in standby standby mode, inputs=0v 2 ua ipdn current consumption in power down v cc < uvloth, inputs=0v 1 ua uvloth undervoltage threshold (v cc decreasing) 2.5 2.6 2.7 v uvlohyst undervoltage threshold hysteresis 100 mv por power-on reset threshold (v cc decreasing) 2.0 v gas gauge a/d converter vin_gg input voltage range -80 +80 mv iin input current for cg pin 500 na adc_res ad converter granularity 12 bits 13 bits 14 bits 47.08 23.54 11.77 uv uv uv adc_offset ad converter offset cg = 0v 12 bits 13 bits 14 bits -2 -2 -3 2 2 3 lsb lsb lsb adc_time ad conversion time (32768hz clock) 12 bits 13 bits 14 bits 125 250 500 ms ms ms adc_acc ad converter gain accuracy at full scale 25 c over temperature range 0.5 1 % % fosc internal time base frequency rosc = 200 k , 0.1% 32768 hz osc_acc internal time base accuracy 25 c, v cc =3.6v over temperature and voltage ranges 2 2.5 % % fosc_ext external time base frequency range 30 70 khz cur_res current register lsb value 11.77 uv chg_res charge register lsb value (32,768 hz clock) =cur_res*2^12*0.5/3600 6.70 uv.h global_ cg_acc gas gauge accuracy (not including the external sense resistor tolerance) using internal time base using external time base 3.5 1 % % electrical characteristics stc3100 6/21 battery voltage and temperature a/d converter vin_adc input voltage range vcc = 5 v 0 5 v lsb lsb value voltage measurement temperature measurement 2.44 0.125 mv c adc_time ad conversion time (32,768 hz clock) 250 ms volt_acc battery voltage measurem ent accuracy 2.7 v application information stc3100 8/21 6 application information figure 6. example of an application schematic using the stc3100 table 5. external components list name value tolerance comments rcg 10 to 50 m 1% gas gauge sense resistor rosc 200 k 0.1% internal oscillator bias resistor c1 1 f supply decoupling capacitor c2 220 nf battery voltage input filter (optional) r1 1 k battery voltage input filter (optional) io volt a ge s tc 3 100 io0 gnd s da s cl ro s c cg vin rcg r1 vcc c1 ro s c option a l filter c2 am00 83 1 stc3100 functional description 9/21 7 functional description 7.1 gas gauge the gas gauge is used to monitor the available battery capacity. the voltage drop across the external sense resistor is integrated during a conversion period and input to a 12- to 14-bit ad converter. the output conversion is accumulated into a 28-bit accumulator. the system controller can control the gas gauge and read the data (upper 16 bits of the accumulator) through the i2c control registers. the ad converter output is in two ? s complement format. when a conversion cycle is completed, the result is added to the charge accumulator and the number of conversions is incremented in a 16-bit counter. figure 7. gas gauge block diagram the controller can read the value of the most recent conversion in two ? s complement format by reading the reg_current registers. these registers are updated at the end of each conversion. the differential inputs are scaled to the full range of the ad converter, introducing a small offset error. a high value written to the cg_cal bit of the control register connects the inputs of the ad converter together, allowing the controller to measure the digital offset error. using this measurement, one can calibrate the gas gauge and reduce errors due to the internal offset error. ad converter 12/14- b it cg gnd 2 8 - b it a cc u m u l a tor ch a rge regi s ter c u rrent regi s ter regi s ter co u nter 16- b it co u nter eoc 16 16 16 control logic cg_en ab le cg_c a li b r a tion cg_clock control regi s ter s 3 276 8 hz 16 2 8 2 8 cg_re s 2 rd_re q cg_r s t 3 am00 83 2 functional description stc3100 10/21 the conversion cycle for n bit resolution is 2 n clock cycles. using the 32,768 hz internal clock, the conversion cycle time is 125 to 500 ms for a 12- to 14-b it resolution. the lsb value is set by the internal gain and internal reference and is 11.77 uv at maximum resolutions. when using an external 30 m illiohms sense resistor, th e 28-bit accumulator results in a capacity of approximately +/- 7300 ma.h. the upper 16 bits of the accumulator can be read from the i2c interface, giving a resolution of 0.2 ma.h. when the battery voltage falls below the under voltage lockout threshold at 2.7 v, the gas gauge system is stopped and the stc3100 stays in standby mode with minimum quiescent current. all registers are maintained down to 2.0 v. below 2.0 v, the registers are reset to their default power-on value. the gas gauge system needs an accurate 32,768 hz timebase to compute the level of charge flowing from/to the batt ery. the stc3100 can operate fr om an internal oscillator, or use an external rtc signal for highest accuracy. 7.2 battery voltage and temperature monitoring the battery voltage and chip temperature (close to the battery temperature) are measured by means of an a/d converter and a multiplexer. this function takes place concurrently to the gas gauge function with a dedicated a/d converter, which means that it does not affect the performance of the gas gauge. to reduce the power consumption, a conversion takes place only every two seconds, alternatively for battery voltage and temperature (so each value is refreshed every four seconds). the conversion cycle takes 2 13 = 8192 clock cycles. using the 32,768 hz internal clock, the conversion cycle time is 250 ms. the resolution is 2.44 mv for the battery voltage and 0.125 c for the temperature. 7.3 general-purpose input/output a general-purpose i/o line is available. the output is an open drain, and an external pull-up resistor may be needed in the application. writing the io0data bit to 0 forces the io0 output low; writing the io0data bit to 1 leaves the io0 output in a high impedance state. reading the io0data bit gives the state of the io0 pin. in standby (cg_run=0), reset (pordet set to 1) and power-down (vcc i2c interface stc3100 12/21 8 i2c interface 8.1 read and write operations the interface is used to control and read the current accumulator and registers. it is compatible with the philips i2c registered trademark (version 2.1). it is a slave serial interface with a serial data line (sda) and a serial clock line (scl). scl: input clock used to shift data. sda: input/output bidirectional data transfers. a filter rejects the potential spikes on the bus data line to preserve data integrity. the bidirectional data line supports transfers up to 400 kbit/s (fast mode). the data is shifted to and from the chip on the sda line, msb first. the first bit must be high (start) followed by the device address and read/write bit control. bits devaddr0 to devaddr2 are factory-programmable, the default device address value being 70h (addrid0 = addrid1 = addrid2 = 0). the stc3100 then sends an acknowledge at the end of an 8-bit long sequence. the next 8 bits correspond to the register address followed by another acknowledge. the data field is the last 8-bit long sequence sent, followed by a last acknowledge. table 6. device address format b7 b6 b5 b4 b3 b2 b1 b0 1110deva ddr2 devaddr1 devaddr0 r/w table 7. register address format b7 b6 b5 b4 b3 b2 b1 b0 regaddr7 regaddr6 regaddr5 regaddr4 regaddr3 regaddr2 regaddr1 regaddr0 table 8. register data format b7 b6 b5 b4 b3 b2 b1 b0 data7 data6 data5 data4 data3 data2 data1 data0 stc3100 i2c interface 13/21 figure 8. read operation figure 9. write operation s t a rt device a ddr reg a ddre ss 8 b it s a re s t a rt device a ddr a reg d a t a 8 b it s a reg d a t a 8 b it s a reg d a t a 8 b it s a addre ss n+1 s t a rt b it = s da f a lling when s cl = 1 7 b it s 7 b it s s top a w s top b it = s da ri s ing when s cl = 1 re s t a rt b it = s t a rt a fter a s t a rt m as ter s l a ve acknowledge = s da forced low d u ring a s cl clock r addre ss n+2 am00 833 s t a rt device a ddr reg a ddre ss 8 b it s a reg d a t a a reg d a t a 8 b it s a reg d a t a 8 b it s a addre ss n+1 s t a rt b it = s da f a lling when s cl = 1 7 b it s8 b it s s top a w s top b it = s da ri s ing when s cl = 1 re s t a rt b it = s t a rt a fter a s t a rt addre ss n+2 am00 83 4 i2c interface stc3100 14/21 8.2 register map the register space provides 12 control registers, 8 read-only (factory otp) registers for unique device id and 32 read/write general-purpose ram registers. mapping of all registers is shown in ta bl e 9 . detailed descriptions of registers 0 (reg_mode) and 1 (reg_ctrl) are shown in ta b l e 1 0 and ta bl e 1 1 . all registers are reset to default values at power-on or reset, and the pordet bit in register reg_ctrl is used to indicate the occurrence of a power-on reset. table 9. register map name address (decimal) type description control registers 0 to 23 reg_mode 0 r/w mode register reg_ctrl 1 r/w control and status register reg_charge_low 2 r gas gaug e charge data, bits 0-7 reg_charge_high 3 r gas gaug e charge data, bits 8-15 reg_counter_low 4 r number of conversions, bits 0-7 reg_counter_high 5 r number of conversions, bits 8-15 reg_current_low 6 r battery current value, bits 0-7 reg_current_high 7 r battery current value, bits 8-15 reg_voltage_low 8 r battery voltage value, bits 0-7 reg_voltage_high 9 r battery voltage value, bits 8-15 reg_temperature_low 10 r temperature value, bits 0-7 reg_temperature_high 11 r tem perature value, bits 8-15 device id registers 24 to 31 reg_id0 24 r part type id = 10h reg_id1 25 r unique part id, bits 0-7 reg_id2 26 r unique part id, bits 8-15 reg_id3 27 r unique part id, bits 16-23 reg_id4 28 r unique part id, bits 24-31 reg_id5 29 r unique part id, bits 32-39 reg_id6 30 r unique part id, bits 40-47 reg_id7 31 r device id crc ram registers 32 to 63 reg_ram0 32 r/w general-purpose ram register 0 ... ... ... reg_ram31 63 r/w general-purpose ram register 31 stc3100 i2c interface 15/21 values held in consecutive registers (such as the charge value in the reg_charge_low and reg_charge_high registers) must be read with a single i2c access to ensure data integrity. it is possible to read multiple values in one i2c acce ss, all values will be consistent. the charge data is coded in 2?s complement format, and the lsb value is 6.70 uv.h. the battery current is coded in 2?s complement format, and the lsb value is 11.77 uv. in 13-bit resolution mode, the 0 bit is always set to zero. in 12-bit resolution, bits 0 and 1 are always set to zero. the battery voltage is coded in binary format, and the lsb value is 2.44 mv. the temperature value is coded in 2?s complement format, and the lsb value is 0.125 c. the temperature of 0 c corresponds to code 0. table 10. reg_mode - address 0 name pos. type def. description sel_ext_clk 0 r/w 0 32,768 hz clock source: 0: auto-detect, 1: external clock gg_res [2,1] r/w 00 gas gauge adc resolution: 00:14 bits, 01:13 bits, 10:12 bits gg_cal 3 r/w 0 0: no effect 1: used to calibrate the ad converters gg_run 4 r/w 0 0: standby mode. accumulator and counter registers are frozen, gas gauge and battery monitor functions are in standby. 1: operating mode. [7..5] unused table 11. reg_ctrl - address 1 name pos. type def. description io0data 0 rx port io0 data status: 0 = io0 input is low, 1 = io0 input is high w1 port io0 data output drive: 0 = io0 output is driven low,1 = io0 output is open gg_rst 1 w 0 0: no effect 1: resets the charge accu mulator and conversion counter. gg_rst is a self-clearing bit. gg_eoc 2 r 1 set at the end of a battery current conversion cycle. clears upon reading. vtm_eoc 3 r 1 set at the end of a batt ery voltage or temperature conversion cycle. clears upon reading. pordet 4 r1 power on reset (por) detection bit: 0 = no por event occurred, 1 = por event occurred w0 soft reset: 0 = release the soft-reset and clear the por detection bit, 1 = assert the soft-reset and set the por detection bit. [7..5] unused package information stc3100 16/21 9 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com. ecopack ? is an st trademark. stc3100 package information 17/21 9.1 miniso-8 package information figure 10. miniso-8 package mechanical drawing table 12. miniso-8 package mechanical data ref. dimensions millimeters inches min. typ. max. min. typ. max. a1.100.043 a1 0.15 0.006 a2 0.75 0.85 0.95 0.030 0.033 0.037 b 0.22 0.40 0.009 0.016 c 0.08 0.23 0.003 0.009 d 2.80 3.00 3.20 0.110 0.118 0.126 e 4.65 4.90 5.15 0.183 0.193 0.203 e1 2.80 3.00 3.10 0.110 0.118 0.122 e 0.65 0.026 l 0.40 0.60 0.80 0.016 0.024 0.031 l1 0.95 0.037 l2 0.25 0.010 k0 8 ccc 0.10 0.004 package information stc3100 18/21 9.2 dfn8 package information figure 11. dfn8 3x3x1.0 mm package mechanical drawing (pitch 0.5 mm) table 13. dfn8 3x3x1.0 mm package mechanical data (pitch 0.5 mm) ref. dimensions millimeters inches min. typ. max. min. typ. max. a 0.80 0.90 1.00 0.031 0.035 0.039 a1 0.02 0.05 0.0008 0.0019 a2 0.55 0.65 0.80 0.021 0.025 0.031 a3 0.20 0.008 b 0.18 0.25 0.30 0.007 0.010 0.012 d 2.85 3.00 3.15 0.112 0.118 0.124 d2 2.20 2.70 0.087 0.106 e 2.85 3.00 3.15 0.112 0.118 0.124 e2 1.40 1.75 0.055 0.069 e 0.50 0.020 l 0.30 0.40 0.50 0.012 0.016 0.020 ddd 0.08 0.003 stc3100 ordering information 19/21 10 ordering information table 14. order codes part number temperature range package packing marking stc3100ist -40c, +85c miniso-8 tape & reel o201 STC3100IQT dfn8 3 x 3 revision history stc3100 20/21 11 revision history table 15. document revision history date revision changes 27-jan-2009 1 initial release. stc3100 21/21 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2009 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com |
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