Digilent 410-286P - Manual

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PmodALS
™ Reference Manual
Revised January, 21 2015
This manual applies to the PmodALS rev. A
DOC#: 502-286 Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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Overview
The Digilent PmodALS demonstrates light-to-digital sensing through a single ambient light sensor. Digilent
engineers designed this Pmod around the Texas Instrument's ADC081S021 analog-to-digital converter and the
Vishay Semiconductor's TEMT6000X01.
1 Functional Description
The PmodALS utilizes a single ambient light sensor (ALS) for user input. The amount of light the ALS is exposed to
determines the voltage level passed into the ADC, which converts it to 8 bits of data. A value of 0 indicates a low
light level and a value of 255 indicates a high light level.
2 Interfacing with the Pmod
The PmodALS communicates with the host board via the SPI protocol . Since the on-board analog-to-digital
converter is a read-only module, the only wires in the SPI protocol that are required are the Chip Select, Master-In-
Slave-Out, and Serial Clock lines. The location of each of these lines on the Pmod header are shown in the table
below.
The PmodALS.

3-wire SPI™ communication interface

8-bit resolution
Features include: