MLX90308CCCUD datasheet(19/26 Pages) MICRO-ELECTRONICS

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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

IINV

Invert signal sign.

GNTP1 Gain & offset of temperature

amplifier.

GNTP0 GNTP = 0 to 3.

CSOF 1 Coarse offset of signal amplifier.

CSOF 0 CSOF = 0 to 3.

CSGN2

CSGN1

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

MODE byte

See Table 9.

GN1L

Fixed gain number (8LSB).

OF1L

Fixed offset number (8LSB).

GNTC1L

First gain TC (8LSB).

OFTC1L

First offset TC (8LSB).

TR1L

PC5L

First temperature point.

Pressure Coefficient 5 (8LSB).

GNTC2L

P5L

Second gain TC.

Pressure point 5 (8LSB).

OFTC2L

PC4L

Second offset TC.

Pressure coefficient 4 (8LSB).

TR2L

P4L

Second temperature point.

Pressure Point 4 (or Signature) (8LSB).

GNTC3L

PC3L

Third gain TC.

Pressure Coefficient 3 (or Signature) (8LSB).

OFTC3L

P3L

Third offset TC.

Pressure Point 2 (or Signature) (8LSB).

Table 13. RAM Byte Definitions

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