BQ40Z50RSMT-R2.B datasheet(4/55 Pages) TI2

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Table 6-1. Pin Functions (continued)

PIN NUMBER

PIN NAME

TYPE

DESCRIPTION

SRN

Analog input pin connected to the internal coulomb counter peripheral for

integrating a small voltage between SRP and SRN where SRP is the top of

the sense resistor.

—

Not internally connected. It is okay to leave floating or to tie to VSS.

SRP

Analog input pin connected to the internal coulomb counter peripheral for

integrating a small voltage between SRP and SRN where SRP is the top of

the sense resistor.

VSS

Device ground

TS1

Temperature sensor 1 thermistor input pin. Connect to thermistor-1. If not

used, connect directly to VSS and configure data flash accordingly.

TS2

Temperature sensor 2 thermistor input pin. Connect to thermistor-2. If not

used, connect directly to VSS and configure data flash accordingly.

TS3

Temperature sensor 3 thermistor input pin. Connect to thermistor-3. If not

used, connect directly to VSS and configure data flash accordingly.

TS4

Temperature sensor 4 thermistor input pin. Connect to thermistor-4. If not

used, connect directly to VSS and configure data flash accordingly.

—

Not internally connected. It is okay to leave floating or to tie to VSS.

BTP_INT

Battery Trip Point (BTP) interrupt output. If not used, connect directly to VSS.

PRES or SHUTDN

Host system present input for removable battery pack or emergency system

shutdown input for embedded pack. A pullup is not required for this pin. If not

used, connect directly to VSS.

DISP

—

Display control for LEDs. If not used, connect directly to VSS.

SMBD

I/OD

SMBus data pin

SMBC

I/OD

SMBus clock pin

LEDCNTLA

—

LED display segment that drives the external LEDs depending on the

firmware configuration. If LEDs are not used, these pins can be left floating or

connected to VSS through a 20-kΩ resistor.

LEDCNTLB

—

LED display segment that drives the external LEDs depending on the

firmware configuration. If LEDs are not used, these pins can be left floating or

connected to VSS through a 20-kΩ resistor.

LEDCNTLC

—

LED display segment that drives the external LEDs depending on the

firmware configuration. If LEDs are not used, these pins can be left floating or

connected to VSS through a 20-kΩ resistor.

PTC

Safety PTC thermistor input pin. To disable, connect both PTC and PTCEN to

VSS.

PTCEN

Safety PTC thermistor enable input pin. Connect to BAT. To disable, connect

both PTC and PTCEN to VSS.

FUSE

Fuse drive output pin. If not used, connect directly to VSS.

VCC

Secondary power supply input

PACK

Pack sense input pin

DSG

NMOS Discharge FET drive output pin. If not used, it can be left floating or

connected to VSS through a 20-kΩ resistor.

—

Not internally connected. It is okay to leave floating or to tie to VSS.

PCHG

PMOS Precharge FET drive output pin. If not used, it can be left floating or

connected to VSS through a 20-kΩ resistor.

CHG

NMOS Charge FET drive output pin. If not used, it can be left floating or

connected to VSS through a 20-kΩ resistor.

BAT

Primary power supply input pin

(1)

P = Power Connection, O = Digital Output, AI = Analog Input, I = Digital Input, I/OD = Digital Input/Output

BQ40Z50-R2

SLUSCS4C – JUNE 2017 – REVISED APRIL 2021

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