Datasheet
Digilent Pmod™ Interface Specification 1.2.0
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 6 of 11
The connection standard for system boards that provide I²C connectors is to use the standard 12-pin right angle
female connector at the board edge for direct connection of peripheral module boards. The connector provides
two sets of the I
2
C signals, power and ground, so that the I
2
C bus can be formed by daisy chaining system boards or
Pmods. The system board can either be the root of one or two daisy chains, or in the middle of a daisy chain.
5 I/O Signal Assignment Conventions
The following define signal assignments to the I/O pins on the connector for certain standard interfaces. In the
following, the direction is defined from the perspective of the host: i.e., ‘Out’ means from the host to the
peripheral; ‘In’ means from the peripheral to the host. Generally, the host is a Digilent system board. The
peripheral will generally be a Digilent Pmod board.
5.1 GPIO
Pmod Interface Type 1 (GPIO)
This interface is used for general purpose logic. The host must provide the ability for all signals to be bi-directional
logic signals. The peripheral may use any of the pins as inputs, outputs, or bi-directional. Should a PWM signal be
used, it should be on pin 2.
Pin #
Signal
Direction
Alternate Signal
Direction
1
IO1
In/Out
-
-
2
IO2
In/Out
PWM
Out
3
IO3
In/Out
-
-
4
IO4
In/Out
-
-
5
GND
6
VCC
Pmod Interface Type 1A (Expanded GPIO)
This interface is used for general purpose logic. The host must provide the ability for all signals to be bi-directional
logic signals. The peripheral may use any of the pins as inputs, outputs, or bi-directional. Should PWM signals be
used, they should be on pins 2 and 8.
Pin
Signal
Direction
Alternate Signal
Direction
1
IO1
In/Out
-
-
2
IO2
In/Out
PWM
Out
3
IO3
In/Out
-
-
4
IO4
In/Out
-
-
5
GND
6
VCC
7
IO5
In/Out
-
-
8
IO6
In/Out
PWM
Out
9
IO7
In/Out
-
-
10
IO8
In/Out
-
-
11
GND
12
VCC