Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
3.13.4 Controlled Pre-charging Hardware
There is another charging mode, Pre-charging mode, which is hardware-controlled
and not software-controlled. This mode is only activated when the Wireless CPU
®
is
OFF and when VCC is in the voltage range of 2.8V < VBATT < 3.2V. The power
supply charger must be connected to CHG_IN (pin 11). In Pre-charging mode, the
battery is charged with a direct current of 50mA.
This mode is not a real charging mode as it is not possible to obtain a full charge with
it, but it is useful to save battery life by preventing the battery from being below the
low limit voltage value.
3.13.5 Temperature Monitoring
Temperature monitoring is only available for the Li-Ion battery with algorithm 1. The
ADIN1/BAT-TEMP (pin 26) ADC 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 11 I Analog Current source input
ADIN1/
BAT-TEMP
26 I Analog A/D converter
Electrical characteristics of battery charging interface
Parameter Minimum Typ Maximum Unit
Charging operating temperature 0 50 °C
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WA_DEV_Q64_PTS_001-003 January 9, 2009
Resolution 10 bits
Sampling rate 216 S/s
ADIN1 / BAT-TEMP
(pin 26 )
Input Impedance ( R ) 1M
Ω
Input signal range 0 2 V
Voltage (for I=Imax) 4.6* V CHG_IN (pin 11)
Voltage (for I=0) 6* V
Current Imax 800 mA
* To be configured as specified by the battery manufacturer