MLX90366 Datasheet, PDF (19/34 Pages) Melexis Microelectronic Systems – Triaxis Position Sensor Assembly feat. SENT

MLX90366
Triaxis^ Position Sensor Assembly feat. SENT
13.3.3. Serial message sequence period
Sequence Length
(serial message count)
8
18
Sequence Length
(frame count)
144
324
Sequence Period
(ms, typical)
121
273
13.3.3.1. User-defined RAM Value
The payloads of the positions 4, 8 (and 12, 16 if relevant) are user-defined. Three possibilities:
1. Error Code
2. 12 LSBs of a user-defined RAM value
3. 12 MSBs of a user-defined RAM value
The positions 4, 8, 12, 16 refer necessarily to the same user-defined RAM address.
Three RAM addresses are of interest:
Variable name
ramTempSens
VG
Norm
Address
4E
46
48
Description
Calibrated Temperature sensor value
Actual Virtual Gain
Actual field norm
The actual absolute Temperature (T) can be derived from the 12 MSBs of ramTempSens (see possibility
3 above) using the following formula (decimal):
T = 8 × (ramTempSens – 35) + 2048
The accuracy of the actual Temperature is = ± 10 DegC.
13.3.3.2. Error Code Rate
The Error Codes are on purpose transmitted every second message, to maximize the rate, which equals
then 36 SENT frames, when the user-defined RAM mode is not enabled (72 otherwise).
13.3.4. Serial Message Error Code
Bit position
0
3
4
5
6
7
8
Diagnostic
GainOOS
ADCSatura
ADCMonitor
VanaMoni
VddMoni
Rough Offset
TempMonitor
Comments
Front-end Gain code Out-of-spec (too low, too high)
Diag
ADC monitor
Analog Internal Supply Too Low
External Supply Too Low, Too High
Front-end Rough Offset too low, too high
Temperature Sensor monitor
MLX90366
Rev. 1.0
Page 19 of 34
Datasheet
25/Jun/13