MLX90308CCC Datasheet, PDF (19/26 Pages) Micro Electronics – Programmable Sensor Interface

MLX90308CCC
Programmable Sensor Interface
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 Coarse gain of signal amplifier.
1
CSGN1
CSGN = 0 to 7. If CSGN > 3,
output range = 0 to 10V. If
0 CSGN0 ^{CSGN <= 3, output range = 0 to}
5V.
Table 13. RAM Byte Definitions
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).
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