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WM_PRJ_Q2686_PTS_001-010
June 30, 2009
Q2686 Wireless CPU
®
3.13.3
Pre-charging
When a charger DC power supply is connected to the CHG-IN input and if the
voltage battery is between 2.8V* and 3.2V, a constant current of 50mA is
provided to the battery.
When the battery is able to supply the Q2686 Wireless CPU
®
, it is automatically
powered on and the software algorithm is activated to finish the charge.
* For the Lithium-ion battery, the minimum voltage must be higher than PCM
lock level.
Note: When pre-charging is launched, the LED0 output blinks automatically.
WARNING:
The Q2686 Wireless CPU
®
can not release the PCM protection inside Lithium
battery pack. Voltage forbidden on the CHG-IN signal if no battery connected
on VBATT signals
.
3.13.4
Temperature Monitoring
Temperature monitoring is only available for the Li-Ion battery with algorithm
1. The ADC1/BAT-TEMP (pin 20) input must be used to sample the
temperature analog signal provided by an NTC temperature sensor. The
minimum and maximum temperature range may be set by AT command.
Pin description of battery charging interface
Signal
Pin number I/O
I/O type
Description
CHG-IN
6,8
I
Analog
Current source input
ADC1/BAT-
TEMP
20 I
Analog A/D
converter
