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DSB45 Development Support Box
Confidential / Released
2.7.2
External application mode
The external application mode transfers signals to an external application provided by the
customer and connected to the 40-pin connector X152.
To ensure that the GSM module operates with the customer application, the application
switches X101-X120 need be set to position "External" as shown in Figure 3.
In this mode, the RS-232 interfaces X201 and X202, the DAI interface X203 are disabled.
The non-locking keys X131 and X132 for switching on and off the GSM module and the RTC
supply are also applicable in external application mode.
Table 5: Pin assignment of external application connector X152 and application switches X101-X120
Pin no.
Signal
1
BATT+
2
VL
3
3V3
4
GND
5
GND
6
PD
7
nc
8
nc
9
2V9 (VDD)
10
IGT
11
EMERGOFF
12
VDDLP
13
SYNC
14
TXD0
15
RXD0
16
RTS0
17
CTS0
18
DTR0
DSB45_HD_V05
Function
GSM module supply positive
voltage (output only)
DSB45 internal logic voltage
(output only)
DSP internal digital supply
voltage (output only)
Ground
Ground
DSP internal power down
signal, inverse to 3V3 (output
only)
---
---
2.9V voltage from GSM
module to supply application
circuits
(off if GSM module in Power
Down state)
Ignition
Emergency / Power Off
Power voltage for Real Time
Clock (RTC)
GSM TX slot indication or
programmable status LED
(see [1] and [2] for details.
Transmit Data (0)
Receive Data (0)
Request To Send (0)
Clear To Send (0)
Data Terminal Ready (0)
Page 17 of 50
s
Application
Setting of
switch
application switch
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X101
External
X102
External
X103
External
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X108
External
X109
External
X110
External
X111
External
X112
External
01.02.2008
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