DSB45 Development Support Box
Confidential / Released
s
DSB45_HD_V05
Page 17 of 50
01.02.2008
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
Function
Application
switch
Setting of
application switch
1
BATT+
GSM module supply positive
voltage (output only)
---
---
2
VL
DSB45 internal logic voltage
(output only)
---
---
3
3V3
DSP internal digital supply
voltage (output only)
---
---
4
GND
Ground
---
---
5
GND
Ground
---
---
6
PD
DSP internal power down
signal, inverse to 3V3 (output
only)
---
---
7
nc
---
---
---
8
nc
---
---
---
9
2V9 (VDD)
2.9V voltage from GSM
module to supply application
circuits
(off if GSM module in Power
Down state)
---
---
10
IGT
Ignition
X101
External
11
EMERGOFF
Emergency / Power Off
X102
External
12
VDDLP
Power voltage for Real Time
Clock (RTC)
X103
External
13
SYNC
GSM TX slot indication or
programmable status LED
(see [1] and [2] for details.
---
---
14
TXD0
Transmit Data (0)
X108
External
15
RXD0
Receive Data (0)
X109
External
16
RTS0
Request To Send (0)
X110
External
17
CTS0
Clear To Send (0)
X111
External
18
DTR0
Data Terminal Ready (0)
X112
External
