Design Kit 90308 Datasheet DownloadLink 4717

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.
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Application Note
DK90308 / DK90314 Evaluation Kit
Demoboard Layout and Jumper Settings
Component side view:
SO16 DUT
Pin Number
Test Point
Function
IO1
Bidirectional I/O
1
IO2
Bidirectional I/O
2
VDD
Regulated Supply Input
9
VBN
Negative Bridge Input
6
VBP
Positive Bridge Input
7
GND
Common Power Ground
15
TMP
Temperature Sensor Input
8
VMO
Voltage Mode Output
12
JP1
TSTB to GND - Factory Setting Jumper Open
CMN
Current Mode Negative Return
14
JP2
FLT to 39nF - Factory Setting Jumper Shorted
COMS
Serial Programming I/O
16
JP4
VMO to 10K - Factory Setting Jumper Shorted
VDD1
Unregulated Supply Input
11
JP5
VMO to 10nF - Factory Setting Jumper Shorted
VCC
Regulated +5V Power Supply
from board
-
OFC
Offset Control Output
5
FLT
Filter Pin
4
J2: +12V
Power Supply +12V Terminal
-
J2: +
Power Supply Ground Terminal
-
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Jumper
Function
+12V Supply to VDD1
- Absolute Voltage Mode - Jumper shorted
- Ratiometric Mode – Jumper open
JP3
- VDD1 will be shorted to VDD
- Current Mode – Jumper Open
Cau tion: Device may be permanently damaged
if this Jumper is not set correctly.
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Application Note
DK90308 / DK90314 Evaluation Kit
Schematic
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Application Note
DK90308 / DK90314 Evaluation Kit
Typical Connection Schemes
Absolute Voltage Output Mode:
+5V Source
TO SERIAL
PORT of PC
REG
Power
Supply
7.5V to 20V
DUT
SO16
Output Voltage
Users
Bridge
Sensor
Note: JP3 shorted for
Absolute Voltage Mode
Temp Resistor
(optional)
Ratiometric Voltage Output Mode:
+5V Source
TO SERIAL
PORT of PC
4.5V - 5.2V Input Power Supply
REG
Power
Supply
7.5V to 20V
DUT
SO16
Output Voltage
Users
Bridge
Sensor
Note: JP3 Must be open for
Ratiometric Voltage Mode
Temp Resistor
(optional)
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Application Note
DK90308 / DK90314 Evaluation Kit
Current Output Mode:
+5V Source
TO SERIAL
PORT of PC
REG
Power
Supply
7.5V to 20V
4 - 20 mA
Output Current
7V - 35V
Supply
DUT
SO16
Note: Do not connect
CMN to GND
Users
Bridge
Sensor
Note: JP3 Must be
open for Current
Output Mode
Temp Resistor
(optional)
External Circuit Communication:
+5V Source
TO SERIAL
PORT of PC
REG
Power
Supply
7.5V to 20V
Connect to Pin16 of
Device in external circuit
DUT
SO16
Note: This is the minimal connections necessary
for communication with a device in a circuit
external from the application board. The board
can only connect to one device at a time therefore
the local device socket U4 must be empty when
connected to an external circuit. All other
connections to the external circuit are subject to
which output mode is required and must be
determined by the user.
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Power Supply output
when JP3 is shorted
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Connect to GND
of external circuit
Note: COMS line should
be kept as short as
possible and free of noise
to avoid misprogramming
of the Device.
Oct-2003
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