BQ27750 Datasheet, PDF (25/34 Pages) Texas Instruments – Impedance Track Battery Gas Gauge and Protection Solution for 1-Series Cell Li-Ion Battery Packs

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bq27750
SLUSCM7 – JUNE 2017
Layout Guidelines (continued)
diode and series resistor provides more robust ESD performance. The I²C clock and data lines have an
internal pull-down. When the gas gauge senses that both lines are low (such as during removal of the pack),
the device performs auto-offset calibration and then goes into SLEEP mode to conserve power.
10.2 Layout Example
CSD17575Q3
CSD17575Q3
PACK +
Power Trace Line
DD D D
SS S G
D D DD
S S SG
PACK –
Differential Input well
matched for accuracy
Thermistor
Reverse Polarity
Portection
1 VSS
13
VCELL/INT 12
PWPD
2 SRN
BAT 11
3 SRP
PBI ¹⁰
4 TS 1
CHG 9
Input filters
Fuse
1s
SCL
SDA
Bus
Communication
5 SCL
6 SDA
PACK 8
DSG ⁷
Power Ground Trace
Via connects to Power Ground
Via connects between two layers
Exposed Thermal Pad
Figure 23. bq27750 Board Layout
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