Quectel SC206E Series Hardware Design page 43

Table 9: Pin Definition of Charging Interface
Pin Name Pin No.
BAT_P 133
BAT_M 183
BAT_THERM 134
BAT_ID 185
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.
VBAT
NTC
GND
Battery
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.
SC206E_Series_Hardware_Design
I/O Description
AI Battery voltage detect (+)
AI Battery voltage detect (-)
AI Battery temperature detect
AI Battery type detect
1
2
3
D1 C4
NM_1 nF
ESD
Comment
Cannot be kept open.
Internal pull up by default.
Supports 47 kΩ NTC thermistor by
default.
If unused, connect it to GND with a
47 kΩ resistor.
Internally pulled down with a 100 kΩ
resistor. If unused, keep it open.
Adapter or USB
D2 C1
C2 C2
100 μF
4.7 μF
ESD
Smart Module Series
USB_VBUS
VBAT
BAT_P
BAT_THERM
BAT_M
C3
33 pF GND
Module
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