bq20z45-R1

www.ti.com

SLUS992 – DECEMBER 2009

PIN FUNCTIONS

PIN

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

OD

be triggered.

12

PRES

I

System / Host present input.

13

TS1

IA

Temperature sensor 1 input

14

TS2

IA

Temperature sensor 2 input

15

PFIN

I

Fuse blow detection input

16

SAFE

OD

Blow fuse signal output

17

SMBD

I/OD

SMBus data line

18

SMBC

I/OD

SMBus clock line

19

NC

-

Not connected

20, 21, 25,

VSS

P

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

28

22

GSRP

IA

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

23

GSRN

IA

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

24

MRST

I

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

26

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

27

RBI

P

short circuit condition

29

RESET

O

Reset output. Connect to MSRT.

30

ASRN

IA

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

31

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

32

VC5

IA, P

stack.

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

33

VC4

IA, P

negative voltage of the second lowest cell in cell stack.

Cell voltage sense input and cell balancing input for the positive voltage of the second lowest cell in

34

VC3

IA, P

cell stack and the negative voltage of the second highest cell in 4 cell applications.

Cell voltage sense input and cell balancing input for the positive voltage of the second highest cell

35

VC2

IA, P

and the negative voltage of the highest cell in 4 cell applications. Connect to VC3 in 2 cell stack

applications

Cell voltage sense input and cell balancing input for the positive voltage of the highest cell in cell

36

VC1

IA, P

stack in 4 cell applications. Connect to VC2 in 3 or 2 cell stack applications

37

BAT

I, P

Battery stack voltage sense input

38

CHG

O

High side N-chan charge FET gate drive

(1)

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

Copyright © 2009, Texas Instruments Incorporated

Submit Documentation Feedback

3

Product Folder Link(s): bq20z45-R1