Digilent I/O Explorer Reference Manual - Page 5

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I/O Explorer™ USB Reference Manual

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2 Rotary encoders with integral push buttons

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Speaker/Buzzer

When operating the I/O Explorer using the factory firmware, these devices are accessible using the DGIO API set as

described in the DGIO Programmer's Reference Manual contained in the Digilent Adept SDK. Refer to the section

Digilent Adept Port Descriptions below for details on the ports used for access to the on-board I/O devices.

Pmod Ports

The I/O Explorer has six Pmod ports for connecting Digilent peripheral modules. There are two styles of Pmod

ports: six-pin and twelve-pin. Both ports use standard pin headers with 100mil spaced pins. The six-pin ports have

the pins in a 1x6 configuration, while the twelve-pin ports use a 2x6 configuration. The six-pin ports provide four

I/O signals, ground, and a switchable power connection. The twelve-pin ports provide eight I/O signals, two

power, and two ground pins. The twelve-pin ports have the signals arranged so that one twelve-pin port is

equivalent to two of the six-pin ports. The power connection is switchable between the regulated 3.3V main board

supply and the unregulated input supply.

When operating the I/O Explorer using the factory firmware, the Pmod ports are accessible via a number of the API

sets provided by the Digilent Adept SDK. In addition to the other ways that they can be used, the I/O pins on the

Pmod ports can be accessed for direct pin input or output using the DPIO API functions described in the DPIO

Programmer's Reference Manual contained in the Digilent Adept SDK. Refer to the section Digilent Adept Port

Descriptions below for information on the various ways that the Pmod ports are used.

Digilent Pmod peripheral modules can either be plugged directly into the ports on the I/O Explorer or attached via

cables. Digilent has a variety of Pmod interconnect cables available.

See the "Connector and Jumper Block Pinout Tables" section below for more information about connecting

peripheral modules and other devices to the I/O Explorer. These tables describe the relationship between the

various Adept software interfaces and the signals available on the connector pins.

Analog Inputs and Outputs

The I/O Explorer provides analog input channels and analog output channels via Analog to Digital (A/D) and Digital

to Analog (D/A) converters on the board. When using the factory firmware, these analog inputs and outputs are

accessed using the DAIO API functions provided by the Digilent Adept SDK and described in the DAIO

Programmer's Reference Manual.

The A/D converters for the analog input channels are provided by the built-in A/D converters in the two

microcontrollers.

The two analog input channels accessible through DAIO port 0 are provided by the A/D converter in the primary

microcontroller. This port supports single sample input mode as well as continuous sampling input mode. These

two analog input channels have input protection diodes to protect from out-of-range input voltages and band

limiting input filters with a cutoff frequency of 2Khz. This port supports sample rates up to 4K samples per second.

This analog input port supports two selectable internal voltage references (2.56V and 3.3V) as well as an external

reference that can be applied to the AREF1 pin on connector J2.

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