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AC75 Hardware Interface Description
Strictly confidential / Preliminary
Feature
Interfaces
2 serial interfaces
USB
I
2
C
SPI
Audio
SIM interface
Antenna
Module interface
Power on/off, Reset
Power on/off
Reset
Special features
Charging
Real time clock
GPIO
AC75_HD_V00.202
Implementation
ASC0:
•
8-wire modem interface with status and control lines,
unbalanced, asynchronous
•
Fixed bit rates: 300 bps to 460,800 bps
•
Autobauding: 1,200 bps to 460,800 bps
•
RTS0/CTS0 and XON/XOFF flow control.
•
Multiplex ability according to GSM 07.10 Multiplexer Protocol.
ASC1:
•
4-wire, unbalanced asynchronous interface
•
Fixed bit rates: 300 bps to 460,800 bps
•
RTS1/CTS1 and software XON/XOFF flow control
Supports a USB 2.0 Full Speed (12Mbit/s) slave interface.
I
2
C bus for 7-bit addressing and transmission rates up to 400kbps.
Programmable with AT^SSPI command.
Alternatively, all pins of the I²C interface are configurable as SPI.
Serial Peripheral Interface for transmission rates up to 6.5 Mbps.
Programmable with AT^SSPI command.
If the SPI is active the I²C interface is not available.
•
2 analog interfaces (2 microphone inputs and 2 headphone
outputs with microphone power supply)
•
1 digital interface (PCM)
Supported SIM cards: 3V, 1.8V
•
50Ohms. External antenna can be connected via antenna
connector.
•
Antenna diagnostic
80-pin board-to-board connector
•
Switch-on by hardware pin IGT
•
Switch-off by AT command (AT^SMSO)
•
Automatic switch-off in case of critical temperature and
voltage conditions.
•
Orderly shutdown and reset by AT command
•
Emergency reset by hardware pin EMERG_RST and IGT.
Supports management of rechargeable Lithium Ion and Lithium
Polymer batteries
Timer functions via AT commands
10 I/O pins of the application interface programmable as GPIO.
Programming is done via AT commands.
Alternatively, GPIO pin10 is configurable as pulse counter.
Page 18 of 120
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27.04.2006
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