bq20z40-R1

www.ti.com

SLUS993A

– DECEMBER 2009 – REVISED MARCH 2011

QFN (RSM) PIN CONFIGURATIONS

PIN

I/O(1)

DESCRIPTION

NO.

NAME

1

NC

—

Not used

—leave floating

2

SMBC

I/OD

SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq20z40-R1

3

NC

—

Not used

—leave floating

4

NC

—

Not used

—leave floating

5

NC

—

Not used

—leave floating

6

SDATA

I/O

Data transfer to and from bq29330

7

SCLK

I/O

Communication clock to the bq29330

8

VSS

—

Connected I/O pin to VSS

9

NC

—

Not used

—leave floating

10

NC

—

Not used

—leave floating

Connections for a small-value sense resistor to monitor the battery charge- and discharge-current

11

SRP

IA

flow

12

NC

—

Not used

—leave floating

Connections for a small-value sense resistor to monitor the battery charge- and discharge-current

13

SRN

IA

flow

Master reset input that forces the device into reset when held low. Must be held high for normal

14

MRST

I

operation

15

VSS

P

Negative Supply Voltage

16

VCC

P

Positive Supply Voltage

17

NC

—

Not used

—leave floating

18

NC

—

Not used

—leave floating

19

VCELL+

I

Input from bq29330 used to read a scaled value of individual cell voltages

20

VCELL

–

I

Input from bq29330 used to read a scaled value of individual cell voltages

21

NC

—

Not used

—leave floating

22

XALERT

I

Input from bq29330 XALERT output

23

TS2

I

Thermistor 2 input

24

TS1

I

Thermistor 1 input

25

CLKOUT

O

32.768-kHz output to the bq29330. This pin should be directly connected to the bq29330 AFE.

26

NC

—

Not used

—leave floating

27

NC

—

Not used

—leave floating

28

PRES

I

Active low input to sense system insertion. This typically requires additional ESD protection.

29

NC

—

Not used

—leave floating

Active low input to detect secondary protector output status, and to allow the bq20z40-R1 to report

30

PFIN

I

the status of the 2nd level protection output

31

SAFE

O

Active high output to enforce additional level of safety protection; e.g., fuse blow

SMBus data open-drain bidirectional pin used to transfer address and data to and from the

32

SMBD

I/OD

bq20z40-R1

(1)

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

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