Battery Charging And Management - Quectel SC200L Series Hardware Design

USIM2_VDD

3.7. Battery Charging and Management

The module supports battery charging and the charger IC supports trickle charging, constant current
charging and constant voltage charging modes.
⚫
Trickle charging: There are two steps in this mode. When the battery voltage is between 1.1 V and
2.05 V, a 70 mA trickle charging current is applied to the battery. When the battery voltage is charged
up and is between 2.05 V and 3.05 V, the charging current can be set to 450 mA maximally.
⚫
Constant current mode (CC mode): When the battery is increased to between 3.05 V and 4.18 V,
the system will switch to CC mode. The charging current is 0.9 A when an adapter is used for battery
charging, and the maximum charging current is 450 mA for USB charging.
⚫
Constant voltage mode (CV mode): When the battery voltage reaches the final value 4.18 V, the
system will switch to CV mode and the charging current will decrease gradually. When the battery
level reaches 100 %, the charging is completed.
Table 9: Pin Definition of Charging Interface
Pin Name Pin No.
BAT_SNS 133
CS_M 183
CS_P 184
BAT_THERM 134
BAT_ID 185
The module supports battery temperature detection in the condition that the battery integrates a
thermistor (10 kΩ 1 % NTC thermistor with a B-constant of 3380 K by default and the thermistor should be
connected to the 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.
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design
1.80/2.95
I/O Description
AI Battery voltage detect
AI Fuel gauge detect (-)
AI Fuel gauge detect (+)
Battery temperature
AI
detect
AI Battery type detect
50
Comment
The maximum input voltage is 4.50 V.
If fuel gauge is not used, connect
these pins to ground.
Externally
LDO1_1V85 with a 47 kΩ resistor.
Supports 10 kΩ NTC thermistor by
default - connect this pin to the 10 kΩ
NTC thermistor.
If unused, connect it to GND with a
10 kΩ resistor.
Input voltage: 0–1.2 V.
If not used, keep it open.
Smart Module Series
-
pull this pin up
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