User's Manual

AC65/AC75 Hardware Interface Description
Confidential / Preliminary
s
AC65/AC75_hd_v00.372 Page 21 of 118 2006-08-03
Feature Implementation
GPIO 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.
Pulse counter Pulse counter for measuring pulse rates from 0 to 1000 pulses
per second.
If the pulse counter is active the GPIO10 pin is not available.
DAC output Digital-to-Analog Converter which can provide a PWM signal.
Phonebook SIM and phone
Evaluation kit
DSB75 DSB75 Evaluation Board designed to test and type approve
Siemens cellular engines and provide a sample configuration for
application engineering.
2.2 AC65/AC75 System Overview
User Application
AC65 / AC75
Application Interface
Charger
Charging
circuit
UART
Antenna
Interface
SPI
USB
DAC
USB
Host
ASC0
(modem)
ASC1
SIM
Digital
Audio
Charge
Power
Supply
I
2
C
Slave
9 x
GPIO
Analog
Audio
1x
GPIO
Pulse
Counter
Antenna
Diagnostic
I
2
C
Headphones
or Headsets
SIM
card
SPI
Slave
Audio
Codec
Figure 1: AC65/AC75 system overview