DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12
Page 16 of 96
2008-08-26
2 General
Overview
2.1
Key Features at a Glance
Table 3: Key features
Feature
Implementation
GSM module interface
•
Direct connection and mechanical fixing of GSM module via 80-pin
board-to-board connector and screws.
Power supply
•
Laboratory PSU (9V…15V)
or
•
Battery 3.3V…4.5V
Battery charging
•
Implemented charging circuit (FET)
•
Operation with plug-in charging adapter
Antenna interface
•
Integrated connection between module’s Hirose connector and SMA
connector
SIM interface
•
SIM card connector with front tray loading and card detection
•
Supported SIM cards: 3V and 1.8V
SD Card interface
•
SD card connector with front slot, card detection indication and write
protection indication
•
Supply voltage: 2.9V
•
Supported
modes:
SD mode or
SPI mode
Audio interfaces
•
Two analog audio interfaces (both with microphone supply) for
connecting a handset, headset or speakerphone.
•
One digital audio interface (DAI)
I²C interface
•
Host
mode
•
Supports 3V or 5V devices (configurable)
•
Connected I²C EEPROM (128kBit) with adjustable addresses
SPI interface
(option)
•
Two interfaces to be used alternatively to other interfaces
•
Host
mode
Serial interfaces
•
Three RS-232C interfaces:
COM1 - serial interface for data communication
COM2 - serial interface for control purposes
COM3 - serial interface for debug purposes
•
Max. baud rate: 460800 bps
USB interfaces
•
USB 1.1 Full Speed (12 Mbit/s) device interface at B receptacle (default)
GPIOs
•
10 GPIOs at pins
•
Switchable pull-up/down resistors (for 8 GPIOs)
•
LED signaling (for 8 GPIOs)
ADC inputs
•
2 analog inputs
•
Switchable loop with DAC output at each line
