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SYSTEM PARTITIONING DIAGRAM

Coloumb

Counter

HWOver

Current &

ShortCircuit

Protection

CellVoltage

Multiplexer

N-ChannelFET

Drive

PreChargeFET

& PGODDrive

PowerMode

Control

SMBD

DISP

VC5

VC4

VC3

VC2

VC1

¯¯¯¯¯

SMBC

¯¯¯¯¯¯

¯¯¯¯

CellBalancing

Temperature

Measurement

LEDDisplay

DataFlash

Memory

SMB 1.1

Impedance

Track ™

GasGauging

SHA-1

Authentication

Over- & Under-

Voltage

Protection

Voltage

Measurement

OverCurrent

Protection

Oscillator

Charging

Algorithm

FuseBlow

Detectionand

Logic

Over

Temperature

Protection

Watchdog

Regulators

RESET

ALERT

¯¯¯¯¯¯

REG33

REG25

VCELL+

MSRT

RBI

SystemControl

AFEHWControl

Pack -

RSNS

5m

– 20m

typ.

Pack +

SMBC

SMBD

bq20z95

GND

VC4

VC3

VC2

VC1

VDD

OUT

CD

bq294xx

1

DSG

2

PACK

3

VCC

4

ZVCHG

5

6

PMS

7

VSS

8

REG33

9

TOUT

10

VCELL+

CHG

BAT

37

VC1

18

VC2

17

VC3

16

VC4

15

VC5

14

ASRP

13

ASRN

12

11

GPOD

19

NC

PRES

TS 2

PFIN

SAFE

SMBD

TS 1

LED4

LED5

GSRP

23

GSRN

24

25

VSS

26

REG25

27

RBI

28

VSS

29

30

31

32

33

34

35

36

38

21

20

22

SMBC

DISP

VSS

43

39

40

41

42

44

LED1

LED2

LED3

RESET

¯¯¯¯¯¯

¯¯¯¯¯

MRST

ALERT

¯¯¯¯¯¯

¯¯¯¯

¯¯¯¯

¯¯¯¯¯

NC

bq20z95

SLUS757 – 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.

bq20z95

DBT Package

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Product Folder Link(s): bq20z95