DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12
Page 21 of 96
2008-08-26
Figure 3: Block diagram
2.5 Interface
Overview
Table 4: Interfaces of the DSB75
Interface
Reference
number
Description
IGT
S421
Ignition push button
Emergency
reset
S420
Emergency reset push button
Handset
X502
Audio interface 1 (4-pin western jack). Intended for connecting a
handset.
SIM
X503
SIM card holder
RF
X506
RF signal (SMA connector)
Green LED V431
DSB ON. Power LED that indicates the operating voltage for the
DSB75.
Yellow LED V430
Module ON. Power LED that indicates the operating voltage for the
GSM module.
SD card
X301
SD card holder
Charger,
Headset,
Carkit
X700, X701
Two different functions provided by the same connector (Lumberg
connector):
a) Input for plug-in charger
b) Audio 2 interface for headset or speakerphone
X700 for old, X701 for new accessories.
9V
GND
X400 (red)
X401 (black)
Supply voltage n9V. Connectors used to attach a laboratory
PSU.
COM1
X201
Serial interface 1 (9-pin SubD connector). RS-232C interface with 8
data and modem control lines. Intended for GPRS data, circuit
switched data, multiplexed data, AT commands.
Connects to the module’s serial interface ASC0.
COM2
X202
Serial interface 2 (9-pin SubD connector). RS-232C interface with 2
data and 2 modem control lines: TXD1 and RXD1 plus RTS1 and
CTS1 for hardware handshake. Intended for GPRS data and AT
commands.
Connects to the module’s serial interface ASC1.
COM3
X205
Debug interface (9-pin SubD connector). RS-232C interface with
2 data lines: TXD2 and RXD2.
Connects to the module’s serial interface ASC2 (for internal use only).
USB B
X110, X111
USB device interface (type B receptacle)
GSM
module
X100
80 pole board-to-board connector for GSM module
RF
X505
RF connector for connecting GSM module via RF cable
Battery X602
Battery
connector
Test points X101, X102
80 test pins (80 pole dual strip
1
); 1:1 connection to B2B connector
X100, Terminal for GPIOs, ADCn_IN lines
