MLX90323 Demo kit description Features Programming tool for Melexis’ sensor interface MLX90323 Fast development of calibration software Fast plug-in to software applications Software library and UI for Windows Communication through RS232 Applications Tools for evaluation of Melexis Sensor interface. Production Equipment for calibration Scope This document describes the use of the Melexis’ evaluation board (EVB) and demo software for programming and calibrating the MLX90323 sensor interface. The demo kit consists of demo software and evaluation board EVB90308 which provides a communication interface between the MLX90323 and PC. All necessary components for implementing the necessary application circuits with the user’s bridge sensor are on board. This document describes the board itself and setup of the common application circuit for the EVB90308. The MLX9323 sensor interfaces provide a versatile programmable interface to a wide assortment of sensors and transducers. The sensor interface provides gain, offset control and temperature correction for the sensor. The device contains on chip EEPROM for storage of the coefficients for making the signal corrections and adjustments. Related documentation - MLX90323_datasheet.pdf - MLX90323_software_description.pdf Rev 002 Page 1 of 7 10/15/08 MLX90323 Demo kit description Table of contents Table of contents ..................................................................................................................................... 2 1 Hardware description ..................................................................................................................... 3 1.1 EVB90308 pin description .................................................................................................... 4 1.2 Schematics .......................................................................................................................... 5 1.3 Power supply requirements .................................................................................................. 5 1.4 Connections......................................................................................................................... 6 2 Setting up communication with the MLX90323 ............................................................................... 7 2.1 Communication successful................................................................................................... 7 2.2 Communication unsuccessful ............................................................................................... 7 Rev 002 Page 2 of 7 10/15/08 MLX90323 Demo kit description Com munications Interface Conne ctor REG IO1 J3 S U P P L Y JP1 Optional Sensor DUT SO16 JP2 JP4 JP3 TMP FLT OFC VBN IO2 PC GND VDD1 VDD VCC 1 Hardware description VBP VMO CMN Fig.1. EVB90308 block diagram Fig. 2. Evaluation board EVB90308 Rev 002 Page 3 of 7 10/15/08 MLX90323 Demo kit description 1.1 EVB90308 pin description Table 1. Pin description Connector Function Pin Connector COM SERIAL connection to PC - COM 12V + 12V Power Connector - 12V GND General Ground Connector 15 GND VBN Negative Bridge Input 7 VBN FLT Filter Pin 4 FLT VBP Positive Bridge Input 6 VBP TMP Temperature sensor Input 8 TMP OFC Offset Control Output 5 OFC VDD Regulated Supply Voltage 9 VDD VDD1 Unregulated Supply Voltage 10 VDD1 CMN Current Mode Negative Rail 14 CMN Communication 16 COMS - VCC COMS VCC Power Supply JP1 TSTB to GND (Jumper open) JP1 JP2 FLT to 39nF (Jumper closed) JP2 Rev 002 J3 Jumper Open for use with 90323 J3 JP4 Shorten U5 pads to VBN (closed) JP4 JP3 Shorten U5 pads to VBP (closed) JP3 Page 4 of 7 10/15/08 MLX90323 Demo kit description 1.2 Schematics Fig. 3. EVB90308 schematics 1.3 Power supply requirements The EVB90308 has to be supplied with two DC power supplies: - board power supply: +12 V, 0.1 A - sensor power supply: +7 V, 0.1 A. Table 2 Min, V Nom, V Max, V Sensor power supply 7 7 35 Board power supply 11 12 13 Rev 002 Page 5 of 7 10/15/08 MLX90323 Demo kit description 1.4 Connections TO com PC Reg 12V Power Supply Opt. Sens DUT SOI16 4-20 mA Output Current 7V-35V Supply Note : Don't tie CMN to GND ! Sensor Bridge Temp Res Fig. 4. Connections of EVB 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. Rev 002 Page 6 of 7 10/15/08 MLX90323 Demo kit description 2 Setting up communication with the MLX90323 After all the connections are done according to figure 4 launch the MLX90323 demo software “EVB90323.exe”. 2.1 Communication successful Check if you can communicate correctly with the device using the software of the EVB90308. Please make sure that you set the correct settings for the communication. Press button “Open Port” to setup communication with the device. The software will give the following message when communication with the software and the EVB are ok: “Open port status = 0” Success sending Reset command. By resetting the device we get a reply back from the device and this ensures proper communication. Fig.5. Communication successful 2.2 Communication unsuccessful When you receive the error code = 0 and a message “Init Error”, the communication with the device is not ok and you have to check your setup. This error can be caused by a not connected serial cable, a bad connected power supply. Please use the cable provided with the EVB and check the connections for the power supply (7V and 12V) used to supply the device. Fig.6. Communication unsuccessful For the software usage details refer to the document “MLX90323_software_description.pdf”. Rev 002 Page 7 of 7 10/15/08