Smart Module Series
SC262R_Series_Hardware_Design 42 / 115
Table 8: Pin Definition of Charging Interface
SC262R series module supports battery temperature detection in the condition that the battery integrates
a thermistor (
47 kΩ 1 % NTC thermistor with a B-constant of 4050 K by default) and the thermistor is
connected to BAT_THERM pin. If the BAT_THERM pin is not connected, there will be malfunctions such
as battery charging failure, battery level display error, etc. The default battery temperature range is
-3.0 °C to 48.5 °C.
A reference design for the battery charging circuit is shown below.
GND
BAT_SNS
BAT_THERM
VBAT
0R
100
μF
NTC
VBAT
33 pF
1
μF
ESD
ESD
1
2
3
USB_VBUS
Adapter or USB
Module
Battery
GND
C1
C2
C3
R1
D1
D2
1
μF
C2
NM_1 nF
C4
Figure 11: Reference Design for Battery Charging Circuit
Mobile devices such as mobile phones or handheld POS systems are powered by batteries. For different
Pin Name
Pin No.
I/O
Description
Comment
BAT_SNS
133
AI
Sensed battery voltage for
charger circuits
The maximum input voltage is 4.2 V.
BAT_THERM
134
AI
Battery temperature detect
Internally pulled up.
Supports 47 kΩ NTC thermistor by
default - externally connect it to the
47 kΩ NTC thermistor.
If it is not used, connect it to GND
with a 47 kΩ resistor.
BAT_ID
185
AI
Battery type detect
Internally pulled down with a 100
kΩ
resistor.
If it is not used, keep it open.
CHG_SEL
127
DI
Charging select
If you use an internal charging chip,
keep this pin open.
If you use an external charging chip,
connect it to GND.
