Specifications

WA_DEV_FEX20_PTS_004 Rev 001 June 30, 2010 20
Expansion Card Product Technical
Specification
Interfaces
Pin Number
Signal Name
Voltage
I/O*
Reset State
Description
Dealing with Unused Pins
21
SPI2-CS
GPIO35
2V8
O
Z
SPI2 Chip Select
NC
22
SPI2-I
GPIO34
2V8
I
Z
SPI2 Data Input
NC
23
RXD2
GPIO15
1V8
O
Z
Auxiliary RS232 Receive
Add a test point for debugging
24
TXD2
GPIO14
1V8
I
Z
Auxiliary RS232 Transmit
(TXD2) Pull-up to VCC_1V8 with
100kΩ and add a test point for
debugging
25
CTS2
GPIO16
1V8
O
Z
Auxiliary RS232 Clear To
Send
(CTS2) Add a test point for debugging
26
RTS2
GPIO17
1V8
I
Z
Auxiliary RS232 Request To
Send
(RTS2) Pull-up to VCC_1V8 with
100kΩ and add a test point for
debugging
27
GPIO8
1V8
I/O
Pull-up
NC
28
GPIO26
SCL
Open
Drain
O
Z
I²C Clock
NC
29
GPIO19
2V8
I/O
Z
NC
30
GPIO27
SDA
Open
Drain
I/O
Z
I²C Data
NC
31
GPIO20
2V8
I/O
Undefined
NC
32
INT0
GPIO3
1V8
I
Z
Interruption 0 Input
If INT0 is not used, it should be
configured as GPIO
33
GPIO23
*
2V8
I/O
Z
NC
34
GPIO22
*
2V8
I/O
Z
NC
35
DTR1-CT108/2
GPIO41
2V8
I
Z
Main RS232 Data Terminal
Ready
(DTR1) Pull-up to VCC_2V8 with
100kΩ
36
PCM-SYNC
1V8
O
Pull-down
PCM Frame Synchro
NC
37
PCM-IN
1V8
I
Pull-up
PCM Data Input
NC
38
PCM-CLK
1V8
O
Pull-down
PCM Clock
NC
39
PCM-OUT
1V8
O
Pull-up
PCM Data Output
NC
40
AUX-DAC
Analog
O
Digital to Analog Output
NC