BQ28550-R1 Datasheet, PDF (3/42 Pages) Texas Instruments – Single Cell Li-Ion Battery Gas Gauge

Not Recommended for New Designs
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5 Pin Configuration and Functions
bq28550-R1
SLUSAS4A – OCTOBER 2012 – REVISED SEPTEMBER 2014
DOUT ¹
COUT ²
VM 3
BAT ⁴
VREG ⁵
VSS ⁶
12 _GPIO
11 _SCL
10 _SDA
9 _TS
8 _SRN
7 _SRP
PIN NUMBER
1
2
PIN NAME
DOUT
COUT
3
VM
4
BAT
5
VREG
6
VSS
7
SRP
8
SRN
9
TS
10
SDA
11
SCL
12
GPIO
13
PWPD
I/O (1)
IA
IA
IA
IA
P
P
IA
IA
IA
I/O
I
I/O
I/O
Pin Functions
DESCRIPTION
The output of gate drive for discharge FET
The output of gate drive for charge FET
Analog input pin connected to the PACKN through a 510-Ω resistor. Overcurrent and short-
circuit protection circuits use the voltage across VM and VSS to detect if excessive charge or
discharge current is flowing through the protection FETs.
Cell voltage measurement input. ADC input. Connect a 0.1-µF ceramic capacitor to VSS.
2.5-V output voltage of the internal integrated LDO. Connect a 0.1-µF ceramic capacitor to
VSS.
Device ground
Analog input pin connected to the internal Coulomb counter where SRP is nearest the
CELL– connection. Connect to a 5-mΩ to 20-mΩ sense resistor.
Analog input pin connected to the internal Coulomb counter where SRN is nearest the
PACKN connection. Connect to a 5-mΩ to 20-mΩ sense resistor.
Pack thermistor voltage sense (use 103AT-type thermistor), ADC input
Serial Data interface for SMBus
Serial Clock interface for SMBus
General Purpose I/O for configurable function (CFET Control or ALERT output)
Texas Instruments recommends connecting the power pad to VSS on the PCB.
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