MLX90366 Datasheet, PDF (16/34 Pages) Melexis Microelectronic Systems – Triaxis Position Sensor Assembly feat. SENT

MLX90366
Triaxis^ Position Sensor Assembly feat. SENT
13. SENT output Protocol
13.1. Generality
The MLX90366 complies with the sub-set “A.3 Single Secure Sensors” of the norm J2716 Revised
JAN2010, but one restriction: the mode without pause pulse is not featured.
13.2. Single Secure Fast Channel
MLX90366 delivers SENT frames according the Single Secure format. This format is explicitly described
in this section.
13.2.1. Frame Content
The MLX90366 SENT frames have 6 data nibbles, and are formatted according the below table. The
optional Pause Pulse is however always present so that every messages have the same fixed length.
SENT Frame : Status
D1-MSN D1-MidN D1-LSN D2-MSN D2-MidN D2-LSN CRC Optional Pause
Status[0]
Status[1]
Status[2]
Status[3]
CRC
D1
D2-MSN
D2-MidN
D2-LSN
Channel 1 indicator ( "1" = error, "0" otherw ise )
0
Enhanced Serial Message
Enhanced Serial Message
Enhanced CRC (the legacy CRC is not featured)
12 bit angle
D2-MSN=Rolling Counter-MSN
D2-MidN=RollingCounter-MidN
D2-LSN=Inv erted copy of D1-MSN
13.2.2. Diagnostic Reporting through the fast channel
13.2.2.1. Diagnostic Reporting, bit Status[0]
The bit Status[0] is high whenever the three following conditions are met:
1. A diagnostic (analog/environmental) detects an error *
2. The reporting of the above error is enabled **
3. The debouncing time has elapsed.
* A diagnostic of type digital cause the circuit to switch in fail-safe-mode
** See EEPROM bits EE_DIAG_SETTINGS
13.2.2.2. Diagnostic Reporting, Channel 1
The diagnostic can be reported through the 12 bit payload of channel 1, and not only through the status
bit Status[0].
The EEPROM parameters EE_ERRORCODE controls the diagnostic reporting through channel 1 as
follow:
MLX90366
Rev. 1.0
Page 16 of 34
Datasheet
25/Jun/13