DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12
Page 63 of 96
2008-08-26
3.14.3
Battery Powered Operation of GSM Module
The external battery connects to the screw
terminal block X602 (see Figure 37).
Figure 37: Battery screw terminal
For battery operation, the toggle switch S601 must be flipped up (position 3). In this case,
the GSM module is powered only from the battery. Furthermore, it is necessary to keep the
laboratory PSU connected for operating parts of the DSB75.
Table 28: Pin assignment of the screw terminal X602
X602 pin.
Function
1, 2
GND
4, 5
VBAT (BATT+)
3
Thermal resistor (NTC)
The following batteries meet the requirements of the GSM module:
Lithium Ion with 10k NTC
Lithium Polymer with 10k NTC
See module specification [1] for details.
3.14.3.1 Charging the Battery
The battery charging current should be supplied from an external plug-in charger connected
to the Lumberg connector X700 or X701 on the DSB75.
Please note that the plug-in charger is not part of the delivery scope of the DSB75. It is
available from Siemens (please ask your local Cinterion contact for support):
Siemens ordering number: A5BHTN00127458 (connector compatible to X701)
Charging can be accomplished regardless whether the battery was deeply or partly
discharged.
The charger has to meet the following requirements:
Output voltage:
4.75V … 10V
Output current:
≥
550mA or
≥
1050mA
B
a
tte
ry
C
o
nn
ec
to
r
B
a
tte
ry
X602
1
5
+
-
3
