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MLX90308CCC Datasheet(PDF) 25 Page - Micro Electronics |
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MLX90308CCC Datasheet(HTML) 25 Page - Micro Electronics |
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25 / 26 page  MLX902xx Name of Sensor Rev Y.X 22/Aug/98 Page 25 MLX90308CCC Programmable Sensor Interface MLX90308CCC Programmable Sensor Interface Page 25 Rev 2.2 23/Oct/01 Pressure 0% 100% 0 170 140oC 25oC -40oC Pressure 0% 100% 1 4 140oC 25oC -40oC Figure 11b. Conditioned Sensor Output Figures 11a and 11b above illustrate the performance of an unconditioned sensor output and a conditioned sensor output versus stimulus (pressure) and temperature. It can be seen that Figure 11a has a range of only 170 mV (maximum range with a 5V supply) and has a non-linear response over a 0-100 psi range. The sensitivity of the unconditioned output will also drift over temperature, as illustrated by the three slopes. The MLX90308 corrects these errors and amplifies the output to a more usable voltage range as shown in Figure 11b. Figure 11. Error Compensation Table 14. Glossary of Terms A/D analog to digital conversion ADC analog to digital converter ASCII American Standard Code for Information Interchange ASIC application specific integrated circuit CM current mode CMN current mode negative (supply connection) CMO current mode output COMS communication, serial CR carriage return CSGN coarse gain CSOF coarse offset CV current / voltage mode select bit DAC digital to analog converter DACFnew filtered DAC value, new DACFold filtered DAC value, old DARDIS DAC resistor disable dB decibel DOGMO digital mode EEPROM electrically erasable programmable read only memory EOC end of conversion flag bit ESD electrostatic discharge ETMI timer interrupt enable ETPI enable temperature interrupt FET field effect transistor FG fixed gain FLT filter pin GNO gain and offset adjusted digitized signal GNOF gain, offset GNTP temperature gain / offset coarse adjustment HS hardware / software limit I/O input / output IFIX fixed current output value IINV input signal invert command bit ILIM current limit kHz kilohertz, 1000 Hz LSB least significant bit mA milliamperes, 0.001 amps MODSEL mode select ms millisecond, 0.001 second MSB most significant bit MUX multiplexer mV millivolts, 0.001 Volts nF nanofarads, 1 X 10 -9 farads OFC offset control PC personal computer, IBM clone pF picofarad, 1 X 10 -12 farads PLL phase locked loop POR power on reset RAM random access memory RISC reduced instruction set computer ROM read only memory RS-232 industry std. serial communications protocol RX receive SAR successive approximation register STC start A/D conversion Tdiff temperature difference Text temperature, external TMI timer Interrupt TMP temperature signal TPI temperature interrupt Tref temperature reference TSTB test mode pin TX transmit UART universal asynchronous receiver / transmitter VBN bridge, positive, input VBP bridge, negative, input VDD supply voltage VM voltage mode VMGN voltage mode gain VMO voltage mode output WCB warn / cold boot Figure 11a. Raw Sensor Output (measured between VPB and VBN) |
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