CC864-DUAL Hardware User Guide
1vv0300791 Rev 4.4 – 2011-01-26
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved.
Page 48 of 63
3.10.
PCM Digital Audio Interface
The CC864-DUAL can support a PCM interface for digital audio.
The PCM interface supports clock rates from 128 kHz to 2.048 MHz and enables
communication with an external CODEC or host application.
Linear,
μ
-law, and A-law CODECs are all supported by the PCM interface.
The PCM interface can be configured and controlled by AT-commands.
The PCM interface is only available on voice enabled product versions.
Pin
Number
Name
I/O
Description
Level
36
PCM_CLOCK
I/O
PCM_CLOCK
CMOS 2.6V
63
TGPIO_10/PCM_TX
I/O
TGPIO10 Configurable
GPIO/PCM_TX
CMOS 2.6V
65
TGPIO_18/PCM_RX
I/O
TGPIO18 Configurable
GPIO/PCM_RX
CMOS 2.6V
71
TGPIO_17/PCM_SYN
C
I/O
TGPIO17 Configurable
GPIO/PCM_SYNC
CMOS 2.6V
3.11. I
2
C Bus Interface (Future)
I
2
C is a two-wire bus for inter-IC communication widely supported by peripheral
components. It is not currently supported and is reserved for future use.
Two wires (or lines), serial data (SDA) and serial clock (SCL), carry information
between the connected devices.
Each device is recognized by a unique address (whether it’s a microcontroller,
memory, LCD driver, stereo DAC, or keyboard) and can operate as either a
transmitter or receiver, depending on the device function.
The CC864-DUAL has the following interface pins
reserved
for future expansion to
support I
2
C:
Pin No
Name
Description
33
SCL
Serial BUS Clock
34
SDA
Serial BUS Data
