BQ20Z40 Datasheet, PDF (2/18 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™ TECHNOLOGY FOR USE WITH THE bq29330

bq20z40
SLUS801A – FEBRUARY 2009 – REVISED MARCH 2009................................................................................................................................................ www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
SYSTEM PARTITIONING DIAGRAM
Pack +
SMBus
Charging
Algorithm
SBS v1.1
Data
Pack -
SHA-1
Authentication
Cell Balancing
Algorithm &
Control
bq20z40
Fail Safe
Protection
Overvoltage &
Undervoltage
Protection
Overrcurrent
Protection
Fuse
Temperature
Measurement
& Protection
32kHz Clock
Generator
bq29330
Validation &
Control
System
Interface
Cell & Pack
Voltage
Measurement
Impedance
Track™ Gas
Gauging
Therm
Supply Voltage
Reset
32KHz
Alert
I²C
LDO
& Therm. Drive
& Reset
Watchdog &
Protection
Timing
Registers
System
Interface
Voltage Level
Translator
Overcurrent &
Short Circuit
Protection
bq29330
N-CH FET
Drive
Charge Pumps
RSNS
5mΩ – 20mΩ typ.
Figure 1.
bq294xy
2
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