www.ti.com

SYSTEM DIAGRAM

LDO, ThermOutputDrive&UVLO

PowerManagement

LDO, TOUT,andPowerModecontrol

I2C

Impedance Track(TM)+LifetimeDataLogging

SMBus

Pack+

Pack-

Discharge/Charge/

PrechargeFETs

CellandPack

Voltage

Measurement

Precharge

FET Drive

2-TierOvercurrentProtection

32-kHzClock

Generator

bq20z80

768Bytesof

UserFlash

Fuse

1stLevelOVand

UVProtection

PackUndervoltage

PowerMode

Control

PrechargeControl

DelayCounters

CellBalancing AlgorithmandControl

CellBalancing

Drive

SystemInterface

SystemWatchdog

VoltageLevel Translator

SystemInterface

32kHz

PowerModeControl

Fail-SafeProtection

T1

1st LevelOC

Protection

TemperatureMeasurement

<1%Error

TINT

SupplyV oltage

bq29312A

PCHFET Drive

RAMRegisters

SBSv1.1Data

bq29312RAM/CommsValidation

bq294xx

XAlert

Sleep

SenseResistor

(5m-20mWtyp)

PFInput

1

2

7

6

5

4

3

38

37

36

35

34

33

32

VIN

TS1

TS2

PU

PRES

SCLK

VSSD

NC

NC

CLKOUT

XCK1/VSSA

XCK2/ROSC

FILT

SAFE

VDDD

VDDA

RBI

SDATA

VSSD

SAFE

SR2

SR1

VSSA

VSSA

8

9

10

11

12

31

30

29

28

27

13

14

19

18

17

16

15

26

25

24

23

22

21

20

NC

NC

SMBC

SMBD

DISP

PFIN

MRST

XALERT

LED1

LED2

LED3

LED4

LED5

VSSD

NC-Nointernalconnection

bq20z80

bq20z80A

SLUS782 – JULY 2007

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.

TSSOP (DBT)

(TOP VIEW)

2

Submit Documentation Feedback

Not Recommended For New Designs