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MLX90308CCC Datasheet(PDF) 19 Page - Micro Electronics |
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MLX90308CCC Datasheet(HTML) 19 Page - Micro Electronics |
19 / 26 page ![]() MLX902xx Name of Sensor Rev Y.X 22/Aug/98 Page 19 MLX90308CCC Programmable Sensor Interface MLX90308CCC Programmable Sensor Interface Page 19 Rev 2.2 23/Oct/01 Notes For Table 11 1. Not all the temperature and pressure coefficients must be used. When a coefficient is unused, the eight LSB’s and the four MSB’s are replaced by 0. 2. The level steering and the alarm mode cannot be active simultaneously because the levels bytes are shared with the two modes. 3. If the alarm mode and the level steering are both active, the level steering mode is dominant. The firmware will run with the level steering mode, by default. 4. If the DIGMO mode (VMO and CMO both active) is active, the alarm will be automatically disabled by the firmware. 5. At PNB_TNB address, the four MSB's correspond to the address of the last pressure point and the four LSB’s to the address of the last temperature point. 6. In the alarm_control variable, the selected input is stored on the three MSB’s. 7. Pi and OFi are 10 bit values, right justified in 12 bits fields. Table 12. Bit Definitions; Coarse Control , Byte 2 Bit Symbol Function 7 IINV Invert signal sign. 6 GNTP1 Gain & offset of temperature amplifier. 5 GNTP0 GNTP = 0 to 3. 4 CSOF 1 Coarse offset of signal amplifier. 3 CSOF 0 CSOF = 0 to 3. 2 CSGN2 1 CSGN1 0 CSGN0 Coarse gain of signal amplifier. CSGN = 0 to 7. If CSGN > 3, output range = 0 to 10V. If CSGN <= 3, output range = 0 to 5V. Byte Functions Remarks 0 MODE byte See Table 9. 1 GN1L Fixed gain number (8LSB). 2 OF1L Fixed offset number (8LSB). 3 GNTC1L First gain TC (8LSB). 4 OFTC1L First offset TC (8LSB). 5 TR1L PC5L First temperature point. Pressure Coefficient 5 (8LSB). 6 GNTC2L P5L Second gain TC. Pressure point 5 (8LSB). 7 OFTC2L PC4L Second offset TC. Pressure coefficient 4 (8LSB). 8 TR2L P4L Second temperature point. Pressure Point 4 (or Signature) (8LSB). 9 GNTC3L PC3L Third gain TC. Pressure Coefficient 3 (or Signature) (8LSB). 10 OFTC3L P3L Third offset TC. Pressure Point 2 (or Signature) (8LSB). Table 13. RAM Byte Definitions |
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