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DSB45 Development Support Box
Confidential / Released
3.1.5
Charging the battery
If your GSM module does not support charging a battery, you can skip this chapter. For more
information refer to [1].
The battery charging current should be supplied from an external plug-in charger connected
to the connector X603 (type Lumberg) at the front of the DSB45 Development Support Box.
Please note that the charger is not part of the delivery scope of DSB45. Suitable plug-in
chargers are for example the charger types C39280-Z4-C301-1 and C39280-Z4-C341-1. If
no suitable plug-in charger is available you may connect a laboratory charger. In this case
please refer to the pin assignment of the X603 connector shown in Table 16 and the
schematic diagram given in the Appendix in Figure 17. The charger shall meet the
requirements specified in [1] and [4].
Charging can be accomplished regardless whether the battery was deeply or partly
discharged. The charging current must be limited to 500mA.
The red CHARGE LED V316 lights permanently when charging is in progress and switches
off when charging is completed.
Table 16: Pin assignment of the X603 connector for the plug-in charger.
Pin no.
Designation
1
GND
2
R
3
U = 6.6V
4 -12
-
The X603 connector is also input for audio equipment as described in section 2.7.5.2.
3.1.6
Real time clock (RTC) supply
During normal operation the GSM module charges the capacitor C101. It is a 100µF
capacitor that enables buffering the RTC for minimum 30s when the battery voltage is
disconnected.
DSB45_HD_V05
I/O
Function
-
Ground
-
4.7k resistor to pin 3 (use depending on charger type)
I
Supply voltage provided by the plug-in charger
-
Not relevant for charger (keep not connected)
Page 29 of 50
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01.02.2008
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