Smart Module Series
SC206E_Series_Hardware_Design 42 / 115
Table 9: Pin Definition of Charging Interface
The 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 battery charge temperature range varies
with different types of batteries.
A reference design for the battery charging circuit is shown below.
GND
BAT_P
BAT_THERM
VBAT
100
μF
NTC
VBAT
33 pF
4.7
μF
ESD
ESD
1
2
3
USB_VBUS
Adapter or USB
Module
Battery
BAT_M
C1
C2
C3
D1
D2
C2
NM_1 nF
C4
GND
Figure 11: Reference Design for Battery Charging Circuit
Mobile devices such as mobile phones or handheld POS systems are powered by batteries. For different
batteries, you should modify the charging and discharging curve correspondingly to achieve the best
performance.
Pin Name
Pin No.
I/O
Description
Comment
BAT_P
133
AI
Battery voltage detect (+)
Cannot be kept open.
BAT_M
183
AI
Battery voltage detect (-)
BAT_THERM
134
AI
Battery temperature detect
Internal pull up by default.
Supports 4
7 kΩ NTC thermistor by
default.
If unused, 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 unused, keep it open.
