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Pmod™ HAT Adapter Reference Manual
This manual applies to the Pmod HAT Adapter Rev. B
Overview
The Pmod HAT Adapter makes it easy to connect Digilent Pmods to a Raspberry Pi. It supports plug-and-play
functionality, only requiring that the host Raspberry Pi be booted with the Pmod HAT attached. The Pmod HAT has
three 2×6 Digilent Pmod ports and provides access to additional I/O available via the Raspberry Pi 40-
pin GPIO connector. The Pmod HAT Adapter comes with example Python libraries hosted on DesignSpark. See the
Software Support section below for more information.
Features include:
•
•
•
•
•
Provides access to full line of Digilent Pmod
peripheral modules.
Enables use of up to three Pmods at a time.
Supports SPI, UART, I2C, and GPIO connections.
Optionally powered through a 5V barrel jack.
Follows Raspberry Pi HAT specification. See
the
Raspberry Pi HAT Introduction
for more
details.
The Pmod HAT Adapter is compatible with all
Raspberry Pi boards that use the 40-
pin GPIO connector:
•
•
•
•
•
•
Raspberry Pi Model A+
Raspberry Pi Model B+
Raspberry Pi 2 B
Raspberry Pi 3 B
Raspberry Pi Zero W
Raspberry Pi Zero
The Pmod HAT Adapter
RS Stock No 1448419
SKU: 410-366
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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Pmod™ HAT Adapter Reference Manual
1
1.1
Functional Description
Connectors and Jumpers
40 Pin Raspberry Pi GPIO Connector (J1):
This connector is used to attach the Pmod HAT to the host Raspberry Pi
and provide access to each of the connector pins. Most of these 40 pins are shared with the Pmod ports. The Pmod
ports are not intended to be used simultaneously with an additional HAT. However, five GPIO pins (22-25 and 27)
are unused by the Pmod HAT Adapter. These pins are available for use by other HATs or as user GPIO. Pmod port
pins are connected to the 40-pin GPIO connector as seen in the Pinout Table Appendix.
External Power Jack (J2):
This connector can be used to provide power to the Pmod HAT adapter and the attached
Raspberry PI. See the
Power
section below for more information.
Pmod Port JA:
The first of the three 2×6 Pmod host ports, this port supports SPI and GPIO Pmods.
Pmod Port JB:
The second of the three 2×6 Pmod host ports, this port supports SPI and GPIO Pmods, as well as 6-
pin I2C Pmods on the bottom row.
Pmod Port JC:
The third of the three 2×6 Pmod host ports, this port supports UART and GPIO Pmods.
Jumpers JP1 & JP2:
These jumpers enable pullup resistors for the Pmod Port JB I2C pins when shorted.
Jumper JP3:
This jumper enables writing to the onboard EEPROM containing the device tree fragment and other
information used to configure the Raspberry Pi OS and drivers.
Shorting this jumper is for advanced use only.
See
the
Raspberry Pi HAT Introduction
for more details.
1.2
Power
The Pmod HAT Adapter can be powered either from the Raspberry Pi through the 40-pin GPIO connector's two 5V
pins, or from an external 5V supply through the power jack. If an external supply is used, it must be able to provide
1.3 Amps of current. In addition, each Pmod GPIO pin can supply at most 16mA of current.
Important!
Make sure to
never
connect both the Pmod HAT Adapter and Raspberry Pi's power supplies at the same
time. When changing power supplies, make sure to first fully disconnect the original supply
2
Software Support
RS Components has produced the DesignSpark Pmod Library which can be used with a Raspberry Pi to control
Pmods through the Pmod HAT Adapter using the Python programming language. Documentation and downloads
for this library can be found at the following locations:
•
•
•
•
Python library at
Python.org.
Documentation and installation instructions on
Readthedocs.io.
Source code at
Github.com.
RS Components Stock No 1448419
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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Pmod™ HAT Adapter Reference Manual
Pmod Pinout Table
JA
40-Pin GPIO Connector Pin #
24
19
21
23
35
40
38
12
Pmod Pin #
1
2
3
4
7
8
9
10
40-Pin GPIO Connector Pin Name
SPI0_CE0/GPIO08
SPI0_MOSI/GPIO10
SPI0_MISO/GPIO09
SPI0_CLK/GPIO11
PCM_FS/GPIO19/PWM1
PCM_DOUT/GPIO21/GPCLK1
PCM_DIN/GPIO20/GPCLK0
PCM_CLK/GPIO18/PWM0
Pmod Pin #
1
2
3
4
7
8
9
10
JB
40-pin GPIO Connector Pin #
26
19
21
23
37
33
5
3
40-Pin GPIO Connector Pin Name
SPI0_CE1/GPIO07
SPI0_MOSI/GPIO10
SPI0_MISO/GPIO09
SPI0_CLK/GPIO11
GPIO26
PWM1/GPIO13
SCL1/GPIO03*
SDA1/GPIO02*
Pmod Pin #
1
2
3
4
7
8
9
10
JC
40-Pin GPIO Connector Pin #
36
8
10
11
7
32
29
31
40-Pin GPIO Connector Pin Name
CTS0/GPIO16
TXD0/GPIO14
RXD0/GPIO15
RTS0/GPIO17
GPCLK0/GPIO04
PWM0/GPIO12
GPCLK1/GPIO05
GPCLK2/GPIO06
* Pullup resistors for pins SCL1 and SDA1 can be enabled by shorting jumpers JP1 and JP2, respectively.
Pins #5 and #11 of each Pmod port are tied to Ground. Pins #6 and #12 of each Pmod port are tied to the HAT
Adapter's 3V3 rail.
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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