MLX90323 Datasheet, PDF (21/25 Pages) Melexis Microelectronic Systems – 4 – 20 mA Loop Sensor Interface with Signal Conditioning and EEPROM

MLX90323
4 – 20 mA Loop Sensor Interface
with Signal Conditioning and EEPROM
Table 8. RAM Byte Definitions (continued)
Byte Functions
Remarks
19 ^{GNTC3[11:8] OFTC3[11:8] Four MSB's, Third Gain TC Four MSB's Third Offset}
GNTC3[11:8]
TC OFTC3[11:8]
20
TR3[9:8]
GNTC4[11:8] Two MSB's, third temperature Four MSB's, Fourth Gain
point t3[9:8]
TC GNTC4[11:8]
21 ^OFTC4[11:8]
-
Four MSB's Fourth Offset TC reserved
OFTC4[11:8]
22
23
24
25-26
27-28
29
35-36
37-38
39-42
43-44
PNB_TNB
n_factor
Not Used
GN
OF
Taddress
A_16
B_16
RESULT_32
Tempo1
45
46-47
48
49
50
51-52
53
54-55
56-57
58-59
Tempo2
-
Coms_backup
P3_copy
Adsav1
Aaccsav
Baccsav
DAC_gain
DAC_offset
Temp_f
60-61
62-63
-
Adsav2
Same as EEPROM.
Temperature filter coefficient 4 LSB’s, 4 MSB = 0
Offset Ordinate of the current gap.
Gain Ordinate of the current gap.
4 bits for the max. temperature address of the current gap;
4 bits for the min. temperature address of the current gap.
16 bits A Register.
16 bits B Register.
32 bits result (for 16 bit multiplication).
Measured temperature, internal or external, and temporary
variable 1.
Temporary variable 2.
Reserved
Address saved when command is send.
Port 3 setting copy.
Address saved at interrupt.
A-Accumulators saved at interrupt.
B-Accumulators saved at interrupt.
DAC gain (GN).
DAC offset (OF).
Filtered temperature. This is a 10 bit number that is left
justified in a 16 bit field.
Reserved
Address saved when call.
Note: Because of space considerations, the measured temperature can’t be kept in the RAM at all times. If
the measured temperature is to be available, the temperature filter variable, n_factor, must be set to 6.
3901090323
Rev 003
Page 21 of 25
Data Sheet
Feb/12