Q2686 Wavecom, Q2686 Datasheet - Page 51

• Manufacturer Part Number: Q2686
• Description: Wireless CPU
• Manufacturer: Wavecom

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BAT-TEMP (pin 20 )
CHG-IN (pin 6, 8 )
3.13.3 Controlled Pre-charging Hardware
There is another charging mode, Pre-charging mode, which is a hardware-
controlled and not software-controlled. This mode is only activated when the
Wireless CPU
VBATT < 3.2V. The charger power supply must be connected to CHG-IN (pin
6,8). In Pre-charging mode, the battery is charged with a direct current of
50mA. The FLASH-LED blinks when this mode is activated.
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 discharged to below the low limit voltage value.
3.13.4 Temperature Monitoring
Temperature monitoring is only available for the Li-Ion battery with algorithm
1. The BAT-TEMP (pin 20) 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.
* To be configured as specified by the battery manufacturer
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WM_PRJ_Q2686_PTS_001-007
Charging operating temperature
BAT-TEMP
CHG-IN
Signal
Electrical characteristics of battery charging interface
Parameter
®
is OFF and when VBATT is in the voltage range of 2.8V <
confidential ©
Pin description of battery charging interface
Pin number
Input Impedance ( R )
Voltage (for I=Imax)
Input signal range
Voltage (for I=0)
6,8
20
Sampling rate
Current Imax
Resolution
I/O
I
I
I/O type
Analog
Analog
Minimum
4.6*
0
0
Current source input
Q2686 Wireless CPU
216
Typ
1M
10
A/D converter
Description
Maximum
800
50
6*
2
Interfaces
March 6, 2007
Unit
Page: 50 / 87
bits
mA
S/s
°C
Ω
V
V
V
®