mlx90323 Melexis Company, mlx90323 Datasheet
mlx90323
Related parts for mlx90323
mlx90323 Summary of contents
Page 1
... The IC has industry standard 4 – current loop output interface and takes power directly from 2-wire signal line. IC works properly over wide voltage range (from the signal line. Page MLX90323 Package Code DF (SOIC16w) Data Sheet March/08 ...
Page 2
... Unique Features .............................................................................................................................................21 9 Application Information...................................................................................................................................21 10 Standard information regarding manufacturability of Melexis products with different soldering processes 22 11 ESD Precautions ..........................................................................................................................................23 12 Package Information ....................................................................................................................................23 13 Disclaimer.....................................................................................................................................................24 3901090323 Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM Page MLX90323 Data Sheet March/08 ...
Page 3
... A/D conversion temperature difference temperature, external timer Interrupt temperature signal temperature interrupt temperature reference test mode pin transmit Universal Asynchronous Receiver / Transmitter bridge, positive, input bridge, negative, input supply voltage warn / cold boot watch dog counter Page MLX90323 Data Sheet March/08 ...
Page 4
... Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM Max DD Min DD Max DD1 ), Page MLX90323 6V 4.5V 35V -0.7V 8mA 100mA 8mA 71mW -40 to +125° -55 to +150° C 150°C Data Sheet March/08 ...
Page 5
... EEPROM. 3901090323 Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM 1 COMS 2 GND 3 TSTB CMN 4 FLT CMO 5 OFC VBN 6 VDD1 7 VBP FET TMP 8 VDD Page MLX90323 Data Sheet March/08 ...
Page 6
... General Electrical Specifications Table 3. MLX90323 Electrical Specifications DC operating parameters: T Parameter Symbol Regulator & Consumption Input voltage range V Supply current I DD Regulated supply voltage V Regulated voltage temperature coefficient Supply rejection ratio PSRR Instrumentation Amplifier Differential input range VBP-VBN IINV = 0 Differential input range ...
Page 7
... Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM CSGN = 00 CSGN = 01 CSGN = 10 CSGN = ohm SENSE Current mode Current sense res = (FLT to GND) GNTP[1, GNTP[1, GNTP[1, GNTP[1, TURBO = 0 TURBO = 1 Page MLX90323 1.05 1.17 V/V 1.71 1.89 V/V 2.77 3.06 V/V 4.48 4.95 V/V 8.4 9.3 mA Ohms 284 2625 mA/V -0 ...
Page 8
... UART baud rate COMS pin input levels COMS Pin Output Resistance 3901090323 Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM TURBO = 0 TURBO = 1 Low High Low High Page MLX90323 2400 Baud 9600 Baud 0.3 0.7 100 Ohms 100 ...
Page 9
... Detailed General Description 7.1 Understanding 4-20 mA current loop interface MLX90323 IC is optimized for industry standard current loop interface. The 4 - 20mA current loop shown in Figure common method of transmitting sensor information in many industrial applications. Transmitting sensor information via a current loop is particularly useful when the information has to be sent to a remote location over long distances. The loop operation is straightforward: a sensor’ ...
Page 10
... This helps to minimize the effect of noise when using an external temperature sensor. The filter equation is: If measured_temp > Temp_f(n) then Temp_f(n+1) = Temp_f(n) + [measured_temp - Temp_f(n measured_temp < Temp_f(n), then 3901090323 Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM Page MLX90323 n_factor ] Data Sheet March/08 ...
Page 11
... If GNTC1 > 2047 => DAC_GAIN If GNTC2,3,4 > 2047 => DAC_GAIN ↓ [V/ DAC − 1023 OFFSET DAC_OFFSET (new value) ~ OF[9:0]+[OFTCi* dT] 3901090323 Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM _ GAIN Page MLX90323 n_factor ] EEPROM table. Data Sheet March/08 ...
Page 12
... Communications The MLX90323 firmware transfers a complete byte of data into and from the memory based on a simple command structure. The commands allow data to be read and written to and from the EEPROM and read from the RAM. RAM data that can be read includes the current digitized temperature and digitized GNO. The commands are described below ...
Page 13
... Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM Hexadecimal Fixed Point Equivalent Signed Number Equivalent 0000h +0.00 3FFh +0.9990234 400h +1.000 7FFh +1.9990234 800h -0.000 0BFFh -0.9990234 Page MLX90323 Data Sheet March/08 ...
Page 14
... GNTCi: signed 12 bits (with MSB for the sign), [-1.9990234, +1.9990234]. OFTCi: signed 12 bits (with MSB for the sign), [-1.9990234, +1.9990234]. 3901090323 Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM 0C00h -1.000 0FFFh -1.9990234 Page MLX90323 Data Sheet March/08 ...
Page 15
... The eight LSB's of the second gain TC GNTC2[7:0]. The eight LSB's of Pressure Point 5 P5[7:0]. The eight LSB's of the second offset TC OFTC2[7:0]. The eight LSB's of the second temperature point T2[7:0]. The eight LSB's of Pressure Point 4 (or Signature) P4[7:0]. The eight LSB's of the third gain TC GNTC3[7:0]. Page MLX90323 Data Sheet March/08 ...
Page 16
... TC OFTC2[11:8] or Four MSB's third gain TC GNTC3[11:8] or Two MSB's third temperature point t3[9:8] or Four MSB's fourth offset TC ordinate OFTC4[11:8] or Page MLX90323 Lower four bits Two MSB's of fixed offset OF[9:8] Four MSB's of the first offset TC OFTC1[11:8]. Four MSB's, second gain TC GNTC2[11: GNTC2[11:8] or Two MSB's Pressure Point 5 P5[9:8] ...
Page 17
... Value sent to output if checksum test fails bit value. These bytes are not used and are available to the user. EEPROM checksum; value needed to make all bytes add to 0FFh. Must be set by user if checksum test is active. Page MLX90323 Data Sheet March/08 ...
Page 18
... Second temperature point. Pressure Point 4 (or Signature) (8LSB). Third gain TC. Third offset TC. Pressure Point 2 (or Signature) (8LSB). Page MLX90323 Invert signal sign. amplifier. Coarse gain of signal amplifier. CSGN = CSGN > 3, output range = 0 to 10V. If CSGN <= 3, output range = ...
Page 19
... A Register. 16 bits B Register. 32 bits result (for 16 bit multiplication). Page MLX90323 Two MSB's of fixed offset OF[9:8]. Four MSB's of the first offset TC OFTC1[11:8] Four MSB's, second ...
Page 20
... Address saved at interrupt. A-Accumulators saved at interrupt. B-Accumulators saved at interrupt. DAC gain (GN). DAC offset (OF). Filtered temperature. This bit number that is left justified bit field. Digitized linearity corrected signal value. Digital mode only. Address saved when call. Page MLX90323 Data Sheet March/08 ...
Page 21
... The signal path can be directed through the processor for digital processing. Programming and Setup The MLX90323 needs to have the compensation coefficients programmed for a particular bridge sensor to create the sensor system. Programming the EEPROM involves some minimal communications interface circuitry, Melexis setup software, and a PC. The communications interface circuitry is available in a development board ...
Page 22
... RoHS compliant products (RoHS = European directive on the Restriction Of the use of certain Hazardous Substances) please visit the quality page on our website: http://www.melexis.com/quality.asp 3901090323 Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM Page MLX90323 Data Sheet March/08 ...
Page 23
... Package Information 0.51 0.33 10.50 10.10 3901090323 Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM 1. Notes: 1. All dimensions in millimeters. 2. Body dimensions do not include mold flash or protrusion, which are not to exceed 0.15mm. 2.65 2.35 0.010 min. Page MLX90323 0.32 0.23 1.27 0.40 Data Sheet March/08 ...
Page 24
... Or for additional information contact Melexis Direct: Phone: +32 1367 0495 E-mail: sales_europe@melexis.com 3901090323 Rev 001 4 – Loop Sensor Interface with Signal Conditioning and EEPROM www.melexis.com Europe, Africa, Asia: Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com ISO/TS 16949 and ISO14001 Certified Page MLX90323 America: Data Sheet March/08 ...