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BQ78350-R1A

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SLUSE05 – DECEMBER 2019

Product Folder Links: BQ78350-R1A

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Copyright © 2019, Texas Instruments Incorporated

(1)

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

5 Description (continued)

The BQ78350-R1A device offers optional LED or LCD display configurations for 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.

6 Pin Configuration and Functions

30-Pin DBT Package

Pin Functions

PIN

NUMBER

PIN NAME

TYPE

DESCRIPTION

1

COM

O(1)

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

5

PRECHG

O

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

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

8

PRES

I

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

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

9

KEYIN

I

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

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

10

SAFE

O

Active high output to enforce an additional level of safety protection (for example, fuse blow)

11

SMBD

I/OD

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

BQ78350-R1A device

12

VEN

O

Active high voltage translation enable. This open drain signal is used to switch the input voltage

divider on/off to reduce the power consumption of the BAT translation divider network.

13

SMBC

I/OD

SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the BQ78350-

R1A device

14

DISP

I

Display control for the LEDs. This pin is typically connected to BQ78350-R1A device REGOUT via

a 100-KΩ resistor and a push-button switch connect to VSS. Not used with LCD display enabled

and can be tied to VSS.

15

PWRM

O

Power mode state indicator open drain output

16

LED1

O

LED1/LCD1 display segment that drives an external LED/LCD, depending on the firmware

configuration