1

XALERT

2

TS2

3

TS1

4

CLKOUT

5

6

PFIN

7

SAFE

8

SMBD

9

NC

10

SMBC

VCELL -

20

VCELL +

19

VCC

18

VSS

17

MRST

16

SRN

15

SRP

14

VSS

13

SCLK

12

SDATA

11

PRES

bq20z40-R1

www.ti.com

SLUS993 – DECEMBER 2009

TSSOP (PW)

(TOP VIEW)

PIN FUNCTIONS

PIN

DESCRIPTION

NO.

NAME

1

XALERT

I

Input from bq29330 XALERT output.

2

TS2

I

3

TS1

I

4

CLKOUT

O

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

5

PRES

I

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

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

6

PFIN

I

7

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

8

SMBD

I/OD

bq20z40-R1

9

NC

–

Not used— leave floating

10

SMBC

I/OD

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

11

SDATA

I/O

Data transfer to and from bq29330

12

SCLK

I/O

Communication clock to the bq29330

13

VSS

–

Connected I/O pin to VSS

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

14

SRP

IA

flow

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

15

SRN

IA

flow

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

16

MRST

I

operation

17

VSS

P

Negative Supply Voltage

18

VCC

P

Positive Supply Voltage

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

(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

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