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Application Note
DK90308 / DK90314 Evaluation Kit
Scope
The DK90308 and DK90314 provide
a communications interface between the
device and PC. All necessary components
for implementing the three application
circuits with the user’s bridge sensor are on
board. This document describes the board
itself and setup of the common application
circuits for the DK90308 and DK90314
Evaluation kit.
Related Products and Tools
MLX90308 Programmable Sensor Interface
MLX90314 Programmable Sensor Interface
SW90308 Software for MLX90308CCC and MLX90314AB
90308CCC90314AB UsersManual.pdf
WWW.MELEXIS.COM
Applications
Absolute Voltage Output Mode : The device uses an external FET to regulate the supply
voltage. The supply voltage is supplied from J2 thru JP3 to VDD1, then the device regulates +5V
on VDD using the onboard FET giving a stable output over varied supply voltage.
Ratiometric Voltage Output Mode: In this application the output follows the supply
voltage; this is used when the device output is tied to an A/D converter sharing the same supply
and ground reference. A 4.5V to 5.2 V supply voltage is supplied thru VDD and VDD1 tied
together. JP3 MUST BE OPEN FOR THIS MODE to avoid permanent damage to the ch ip.
Current Output Mode: In Current Mode the device supplies a 4 to 20mA current range for
use as a 2-wire analog sensor. VDD is regulated by the onboard FET from the supply (7V to
35V) thru VDD1. JP3 must be open to separate the interface circuit supply thru J2 from the
device current supply thru VDD1. The device supply ground must be floating with respect to the
interface circuit ground. DO NOT CONNECT CMN to GND.
The DK90308 and DK90314 can also be used to communicate with the MLX90308 and
MLX90314 in custom external circuits.
For more information about the MLX90308 and MLX90314 consult the device datasheet.
39011yyyyyzz
Rev www
Page 1 of 5
Oct-2003
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