BQ27350 Datasheet, PDF (2/33 Pages) Texas Instruments – Single Cell Li-Ion Battery Manager With Impedance Track Fuel Gauge Technology

bq27350
Single Cell Li-Ion Battery Manager
With Impedance Track Fuel Gauge Technology
SLUS754 – MARCH 2007
www.ti.com
Contents
1 INTRODUCTION .......................................... 1
1.1 FEATURES ........................................... 1
1.2 APPLICATIONS ...................................... 1
1.3 DESCRIPTION ....................................... 1
2 DEVICE INFORMATION ................................. 3
2.1 AVAILABLE OPTIONS ............................... 3
2.2 PIN DIAGRAM........................................ 3
2.3 TERMINAL FUNCTIONS ............................. 3
3 ELECTRICAL SPECIFICATIONS ...................... 4
3.1 ABSOLUTE MAXIMUM RATINGS ................... 4
3.2 RECOMMENDED OPERATING CONDITIONS...... 4
3.3 POWER-ON RESET.................................. 4
3.4 TEMPERATURE SENSOR CHARACTERISTICS ... 4
3.5 LOW FREQUENCY OSCILLATOR................... 5
3.6 HIGH FREQUENCY OSCILLATOR .................. 5
3.7 INTEGRATING ADC (COULOMB COUNTER)
CHARACTERISTICS ................................. 5
3.8 ADC (TEMPERATURE AND CELL VOLTAGE)
CHARACTERISTICS ................................. 5
3.9 I²C-COMPATIBLE INTERFACE TIMING
CHARACTERISTICS ................................. 5
4 GENERAL DESCRIPTION .............................. 7
4.1 DATA COMMANDS .................................. 8
4.2 EXTENDED DATA COMMANDS ................... 13
4.3 DATA FLASH INTERFACE ......................... 16
4.4 MANUFACTURER INFORMATION BLOCKS ...... 16
4.5 ACCESS MODES ................................... 17
4.6 SEALING/UNSEALING DATA FLASH ACCESS ... 17
4.7 DATA FLASH SUMMARY........................... 17
5 FUNCTIONAL DESCRIPTION ........................ 19
5.1 FUEL GAUGING .................................... 19
5.2 IMPEDANCE TRACK VARIABLES ................. 20
5.3 TEMPERATURE MEASUREMENT ................. 21
5.4 OVER-TEMPERATURE INDICATION .............. 22
5.5 CHARGING AND CHARGE TERMINATION
INDICATION......................................... 22
5.6 POWER MODES.................................... 22
5.7 POWER CONTROL................................. 24
5.8 AUTOCALIBRATION................................ 25
6 COMMUNICATIONS .................................... 25
6.1 I²C INTERFACE..................................... 26
6.2 AUTHENTICATION ................................. 27
7 REFERENCE SCHEMATIC............................ 27
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Contents
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