MLX90314
Programmable Sensor Interface
Table 12. Bit Definitions;
Coarse Control , Byte 2
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.
Bit Symbol Function
7
6
IINV
Invert signal sign.
2. The level steering and the alarm mode cannot be
active simultaneously because the levels bytes are
shared with the two modes.
GNTP1 Gain & offset of temperature
amplifier.
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.
GNTP = 0 to 3.
5
4
3
2
1
0
GNTP0
CSOF 1 Coarse offset of signal amplifier.
CSOF = 0 to 3.
CSOF 0
4. If the DIGMO mode (VMO and CMO both active) is
active, the alarm will be automatically disabled by the
firmware.
CSGN2 Coarse gain of signal amplifier.
CSGN = 0 to 7. If CSGN > 3,
CSGN1
output range = 0 to 10V. If
CSGN <= 3, output range = 0 to
5V.
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.
CSGN0
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 13. RAM Byte Definitions
Byte
0
Functions
MODE byte
GN1L
Remarks
See Table 9.
1
Fixed gain number (8LSB).
Fixed offset number (8LSB).
First gain TC (8LSB).
2
OF1L
3
GNTC1L
OFTC1L
4
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).
MLX902xx Name of Sensor Rev Y.X 22/Aug/98
3901090314
Page 19
Page 19
Nov/04
Rev 007
MELEXIS [ Melexis Microelectronic Systems ]
