Fibocom SU806 Series User Manual

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FIBOCOM SU806 Series Hardware Guide Page 43 of 91
3.12 Battery Power Supply Interface
SU806 series module just support circuit modes coulomb counter fuel gauge, if use coulomb counter IC
externally, please connect SENSE_P and SENSE_N pin to GND.
Table 3-16 Battery power supply pin definition
Pin Name
Pin Num
I/O
Description
Note
CHARGE_SEL
127
DI
Charge modes select
Reserved
VBAT_SNS
133
AI
Battery voltage sense
-
VBAT_THERM
134
AI
Battery thermal detect input
NTC resistor is 47K
SENSE_N
258
AI
Battery fuel gauge negative input
Reserved
SENSE_P
259
AI
Battery fuel gauge positive input
Reserved
Fuel gauge reference design is shown in the following figure:
VBAT
VBAT_SNS
Module
VBAT_THERM
SENSE_P
SENSE_N
GND
Battery Connector
VBAT
THERM
GND
20mΩ±1%
Figure 3-14 Fuel gauge reference design
Trace routing of SENSE_P and SENSE_N should follow differential rule.
The impedance of VBAT_SNS pin varies with the use scenario, if VBAT_SNS not connect with
battery directly, recommend add isolators between VBAT_SNS pin and battery.
Note:

Fibocom SU806 Series Specifications

General

Brand	Fibocom
Model	SU806 Series
Category	Computer Hardware
Language	English