The Shield and Pmod interfaces share signals, including the digital I/O. Each Shield interface has 16
digital I/O, and the four Pmod interfaces each have 8 digital I/O. See the following sections for
information on how the Shield and Pmod interfaces share the digital I/O signals:
• A.2 Arduino Shield connectors on page Appx-A-76.
• A.3 Peripheral Module (Pmod) connectors on page Appx-A-80.
The interfaces enable the use of off‑the‑shelf sensor interfaces, for example, WiFi, Bluetooth, proximity
sensors, and gyro sensors, to suit custom design requirements. The interfaces also enable you to add
full‑custom sensor modules to the system.
Shield interfaces
Each Shield interface has 16 I/O and supports the choice of 3V3 or 5V I/O, independently selectable for
each Shield using two user‑links.
The outputs from the digital I/O user‑links also act as the digital I/O voltage references for the Shields.
Other links, one for each Shield, select 5V or 12V for the power inputs, VIN0 and VIN1.
Note
The links also select I/O references and power inputs to the Pmod interfaces.
See Shield and Pmod power and I/O reference voltage user-links on page 2-44 for more information on
the use of the user‑links.
A 12‑bit ADC supports six analog channels on each Shield.
Pmod interfaces
The Pmod interfaces are an alternative to the Shield interfaces. Each Pmod expansion header has 8
digital I/O and supports the choice of 3V3 or 5V digital I/O. You can select the digital I/O using two
user‑links on the board. One user‑link selects 3V3 or 5V digital I/O operation for Pmod 0 and Pmod 1.
The other user‑link selects 3V3 or 5V operation for Pmod 2 and Pmod 3.
The outputs from the digital I/O user‑links also act as the digital I/O voltage references for the Pmod
expansion boards.
Two other links select 5V or 12V for the power inputs, VIN0 and VIN1.
Note
The links also select digital I/O references and power inputs to the Shield interfaces.
See Shield and Pmod power and I/O reference voltage user-links on page 2-44 for more information on
the use of the user‑links.
The locations of the Pmod connectors support the use of a dual‑connector board, if required.
The Pmod interfaces do not support analog I/O.
Shield and Pmod power and I/O reference voltage user-links
The following figure shows the user‑links that select I/O voltage level and power inputs to the Shield and
Pmod interfaces. The figure shows the user‑links that select 12V or 5V power, and 5V or 3V3 I/O
references, for the Shields.
2 Hardware description
2.16 Arduino Shield and Pmod interfaces
100765_0000_04_en Copyright © 2017–2020 Arm Limited or its affiliates. All rights
reserved.
2-44
Non-Confidential
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