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bq78350-R1

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SLUSCD0B – AUGUST 2015 – REVISED NOVEMBER 2018

Product Folder Links: bq78350-R1

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(1)

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

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-R1 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-

R1 device

14

DISP

I

Display control for the LEDs. This pin is typically connected to bq78350-R1 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

17

LED2

O

LED2/LCD2 display segment that drives an external LED/LCD, depending on the firmware

configuration

18

LED3

O

LED3/LCD3 display segment that drives an external LED/LCD, depending on the firmware

configuration

19

LED4

O

LED4/LCD4 display segment that drives an external LED/LCD, depending on the firmware

configuration