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PmodTMP2
™ Reference Manual
Revised May 24, 2016
This manual applies to the PmodTMP2 rev. B
DOC#: 502-221
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 1 of 3
Overview
The PmodTMP2 is an ambient temperature sensor powered by the
Analog Devices
®
ADT7420
. Through the I
2
C
interface, users may appreciate a resolution of 0.0078°C through 16 bits of data.
1
Functional Description
The PmodTMP2 uses an 8-pin connector that allows for communication via I
2
C, and provides pins to daisy-chain
the PmodTMP2 to other I
2
C devices. The PmodTMP2 also provides two 2-pin headers for selecting the I
2
C address
of the chip, and two 2-pin headers for controlling external devices based upon temperature thresholds defined by
the user in software.
2
Interfacing with the Pmod
The PmodTMP2’s onboard ADT7420 chip acts as a slave device using the industry standard I
2
C communication
scheme. To communicate with the PmodTMP2 device the I
2
C master device must specify a slave address (0x48-
0x4B) and a flag indicating whether the communication is a read (1) or a write (0). This is followed by the actual
data transfer. For the ADT7420, the data transfer should consist of the address of the desired device register
followed by the data to be written to the specified register. To read from a register the master must write the
desired register address to ADT7420, then send an I
2
C restart condition, and send a new read request to the
The PmodTMP2.
16-bit ambient temperature sensor
Typical accuracy better that 0.25ºC
240 ms continuous conversion time
Programmable over and under-
temperature control pins
No calibration required
Small PCB size for flexible designs 1.0“ ×
0.8” (2.5 cm × 2.0 cm)
2×4-pin connector with I2C interface
Follows
Digilent Pmod Interface
Specification
Library and example code available
in
resource center
Features include: