Specifications

WA_DEV_FEX20_PTS_004 Rev 001 June 30, 2010 23
Expansion Card Product Technical
Specification
Interfaces
Table 10: Reset State Definition
Parameter
Definition
0
Set to GND
1
Set to supply 1V8 or 2V8 depending on I/O type
Pull-down
Internal pull-down with ~60K resistor.
Pull-up
Internal pull-up with ~60K resistor to supply 1V8 or 2V8 depending on I/O type.
Z
High impedance
Undefined
Caution: Undefined must not be used in an application if a special state is required at reset.
These pins may be a toggling a signal(s) during reset.
4.3. General Purpose Input/Output
The Expansion Card provides a total of 20 General Purpose I/O. These can be used to control any
external device such as GPS, Bluetooth, LCD or any other external application.
Note that these GPIOs are only available if the multiplexed counterparts aren’t used.
Refer to the table below for the pin description of the GPIO.
Table 11: GPIO Pin Description
Pin Number
Signal
I/O
I/O Type
Reset State
Multiplexed With
32
GPIO3
I/O
1V8
Z
INT0
27
GPIO8
I/O
1V8
Pull-up
Not mux
24
GPIO14
I/O
1V8
Z
CT103 / TXD2
23
GPIO15
I/O
1V8
Z
CT104 / RXD2
25
GPIO16
I/O
1V8
Z
~CT106 / CTS2
26
GPIO17
I/O
1V8
Z
~CT105 / RTS2
29
GPIO19
I/O
2V8
Z
Not mux
31
GPIO20
I/O
2V8
Undefined
Not mux
34
GPIO22
I/O
2V8
Z
Not mux*
33
GPIO23
I/O
2V8
Z
Not mux*
28
GPIO26
I/O
Open Drain
Z
SCL
30
GPIO27
I/O
Open Drain
Z
SDA
16
GPIO28
I/O
2V8
Z
SPI1-CLK
18
GPIO29
I/O
2V8
Z
SPI1-IO
17
GPIO30
I/O
2V8
Z
SP1-I
15
GPIO31
I/O
2V8
Z
~SPI1-CS
19
GPIO32
I/O
2V8
Z
SPI2-CLK
20
GPIO33
I/O
2V8
Z
SPI2-IO
22
GPIO34
I/O
2V8
Z
SP2-I
21
GPIO35
I/O
2V8
Z
~SPI2-CS
35
GPIO41
I/O
2V8
Z
~CT108-2 / DTR1
* If a Bluetooth module is used, these GPIOs must be reserved.
Refer to section 4.2 Electrical Information for Digital I/O for open drain, 2V8 and 1V8 voltage
characteristics and reset state definitions.