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bq20z95

SLUS757 – JULY 2007

TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NO.

NAME

1

DSG

O

High side N-chan discharge FET gate drive

Battery pack input voltage sense input. It also serves as device wake up when device is in shutdown

2

PACK

IA, P

mode.

Positive device supply input. Connect to the center connection of the CHG FET and DSG FET to

3

VCC

P

ensure device supply either from battery stack or battery pack input

4

ZVCHG

O

P-chan pre-charge FET gate drive

High voltage general purpose open drain output. Can be configured to be used in pre-charge

5

GPOD

OD

condition

Pre-charge mode setting input. Connect to PACK to enable 0v pre-charge using charge FET

6

PMS

I

connected at CHG pin. Connect to VSS to disable 0V pre-charge using charge FET connected at

CHG pin.

7

VSS

P

Negative device power supply input. Connect all VSS pins together for operation of device

8

REG33

P

3.3V regulator output. Connect at least a 2.2

µF capacitor to REG33 and VSS

9

TOUT

P

Thermistor bias supply output

10

VCELL+

-

Internal cell voltage multiplexer and amplifier output. Connect a 0.1

µF capacitor to VCELL+ and VSS

Alert output. In case of short circuit condition, overload condition and watchdog time out this pin will

11

ALERT

I/OD

be triggered.

12

NC

-

Not connected

13

TS1

IA

Temperature sensor 1 input

14

TS2

IA

Temperature sensor 2 input

15

PRES

I/OD

System / Host present input. Pull up to TOUT

16

PFIN

I/OD

Fuse blow detection input

17

SAFE

I/OD

blow fuse signal output

18

SMBD

I/OD

SMBus data line

19

NC

-

Not connected

20

SMBC

I/OD

SMBus clock line

21

DISP

I/OD

Display enable input

22

VSS

P

Negative device power supply input. Connect all VSS pins together for operation of device

23

LED1

I

LED 1 current sink input

24

LED2

I

LED 2 current sink input

25

LED3

I

LED 3 current sink input

26

LED4

I

LED 4 current sink input

27

LED5

I

LED 5 current sink input

28

GSRP

IA

Coulomb counter differential input. Connect to one side of the sense resistor

29

GSRN

IA

Coulomb counter differential input. Connect to one side of the sense resistor

30

MRST

I

Reset input for internal CPU core. connect to RESET for correct operation of device

31

VSS

P

Negative device power supply input. Connect all VSS pins together for operation of device

32

REG25

P

2.5V regulator output. Connect at least a 1

µF capacitor to REG25 and VSS

RAM backup input. Connect a capacitor to this pin and VSS to protect loss of RAM data in case of

33

RBI

P

short circuit condition

34

VSS

P

Negative device power supply input. Connect all VSS pins together for operation of device

35

RESET

O

Reset output. Connect to MSRT.

36

ASRN

IA

Short circuit and overload detection differential input. Connect to sense resistor

37

ASRP

IA

Short circuit and overload detection differential input. Connect to sense resistor

Cell voltage sense input and cell balancing input for the negative voltage of the bottom cell in cell

38

VC5

IA, P

stack.

Cell voltage sense input and cell balancing input for the positive voltage of the bottom cell and the

39

VC4

IA, P

negative voltage of the second lowest cell in cell stack.

(1)

I = Input, IA = Analog input, I/O = Input/output, I/OD = Input/Open-drain output, O = Output, OA = Analog output, P = Power

Copyright © 2007, Texas Instruments Incorporated

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