1

2

7

6

5

4

3

20

19

18

17

16

15

14

SDA

SCL

PRES

PRECHG

COM

ALERT

SMBA

ADREN

VCC

VSS

MRST

VSS

VSS

SMBD

SAFE

8

13

9

10

12

11

PWRM

GPIO A

VEN

SMBC

VAUX

LED1

LED2

LED3

LED4

LED5

RBI

GPIO B

DISP

BAT

KEYIN

21

22

23

24

25

26

27

28

29

30

bq78350-R1

www.ti.com

SLUSCD0 – AUGUST 2015

6 Description (continued)

The bq78350-R1 controller and the bq769x0 AFE support from 3-series to 15-series cell applications. The

bq78350-R1 provides an accurate fuel gauge and state-of-health (SoH) monitor, as well as cell balancing and a

full range of voltage-, current-, and temperature-based protection features.

The bq78350-R1 offers optional LED or LCD display configurations for the capacity reporting. It also makes data

available over its SMBus 1.1 interface. Battery history and diagnostic data is also kept within the device in non-

volatile memory and is available over the same interface.

7 Pin Configuration and Functions

30-Pin DBT Package

Pin Functions

PIN

DESCRIPTION

NO.

NAME

1

COM

O

Open Drain Output LCD common connection. Leave unconnected if not used.

2

ALERT

I

Input from the bq769x0 AFE

3

SDA

I/O

Data transfer to and from the bq769x0 AFE. Requires a 10-k pullup to VCC.

4

SCL

I/O

Communication clock to the bq769x0 AFE. Requires a 10-k pullup to VCC.

Programmable polarity (default is active low) output to enable an optional precharge FET. This pin

5

PRECHG

O

requires an external pullup to 2.5 V when configured as active high, and is open drain when

configured as active low.

6

VAUX

AI

Auxiliary voltage input. If this pin is not used, then it should be tied to VSS.

7

BAT

AI

Translated battery voltage input

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

8

PRES

I

pin is not used, then it should be tied to VSS.

A low level indicates application key-switch is inactive on position. A high level causes the DSG

9

KEYIN

I

protection FET to open. If this pin is not used, then it should be tied to VSS.

(1)

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

Copyright © 2015, Texas Instruments Incorporated

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