MLX90367EDC-ABS Datasheet, PDF (27/36 Pages) Melexis Microelectronic Systems – TriaxisÒ Position Sensor IC feat. SENT

MLX90367
Triaxis^® Position Sensor IC feat. SENT
16. MLX90367 Self Diagnostic
The MLX90367 provides numerous self-diagnostic features. Those features increase potentially the
functional safety of safety-related systems as it reduces the risk of erroneous angle reporting in case of
internal or external failure modes (“fail-safe”).
Diagnostic Item
Start-up phase Diagnostics
RAM March C- 10N Test
Watchdog BIST
Under Voltage Monitoring
SUPPLYMONI =
(MT3VB) OR (MT4VB)
Over Voltage Monitoring
MT7V
BG Loop Diagnostics
ROM 16bit checksum
( continuous )
EEPROM 8 bit CRC Check
(continuous)
Watchdog
( continuous )
DSP Loop Diagnostics
ADC Clipping
ADCCLIP
Action
Fail-safe mode **
** CPU reset after 120ms
Fail-safe mode **
** CPU reset after 120ms
Start-up on Hold **
** CPU reset after 120ms
PTC entry
Fail-safe mode **
** CPU reset after 120ms
Fail-safe mode **
** CPU reset after 120ms
CPU reset
Debouncing (programmable
Effect on Output
Diagnostic low/ high
Reporting (optional)
Diagnostic low/ high
Reporting (optional)
Diagnostic low/high
Output in High-
Impedance
Diagnostic low//high
Reporting (optional)
Diagnostic low/high
Reporting (optional)
--
SENT Status bit0 = 1
(optional)
Type
Digi HW
Digi HW
Environ
&Analog
Environ
Digi HW
Digi HW
Digi HW
Environ
&Analog
Debouncing (programmable)
Virtual Gain Code Out-of-spec
GAINOOS
SENT Status bit0 = 1
(optional)
Environ
&Analog
Virtual Gain Code Saturation
[GAINMIN..GAINMAX]
ADC Monitor (Analog to Digital
Converter)
ADCMONI
Saturation (optional)
Debouncing (programmable)
Under Voltage Monitoring
SUPPLYMONI =
(MT3VB) OR (MT4VB)
Supply Debouncing
(programmable)
Over Voltage Monitoring
MT7V
Temperature Sensor Monitor
TEMPMONI
PTC entry after PTC
Debouncing
Debouncing (programmable)
Gain Saturated @
GAINMIN-GAINMAX
SENT Status bit0 = 1
(optional)
SENT Status bit0 = 1
(optional)
Output in High-
Impedance
SENT Status bit0 = 1
(optional)
Environ
&Analog
Analog
HW
Environ
&Analog
Environ
Analog
Temperature > 170degC (± 20)
Temperature < -60degC (± 20)
Saturate value used for the
compensation to -40degC and
+150degC resp.
No effect
Hardware Diagnostics ( continuously checked by dedicated Logic )
Read/Write Access out of
Fail-safe mode **
Diagnostic Low/High
physical memory
** CPU reset after 120ms
Write Access to protected area
(IO and RAM Words)
Unauthorized Mode Entry
EEPROM Error Correcting
Code ( Hamming correction )
Fail-safe mode **
** CPU reset after 120ms
Fail-safe mode **
** CPU reset after 120ms
(Transparent) Error
Correction
Diagnostic low/high
Diagnostic low/high
no effect
Environ
&Analog
Digi HW
Digi HW
Digi HW
Digi HW
Monitoring Rate
Reporting Rate
n/applicable (start-
up only)
n/applicable (start-
up only)
n/applicable (start-
up only)
n/applicable (start-up only)
n/applicable (start-up only)
n/applicable (start-up only)
n/applicable (start- n/applicable (start-up only)
up only)
800ms
10ms
120ms
800ms
10ms
n/a
5/DSP
1/DSP
n/applicable
Not a diagnostic
1/DSP
1/DSP
2ms
6ms
x
Diag_Debounce_Thresh
Diag_Debounce_Stepup
6ms
x
Diag_Debounce_Thresh
Diag_Debounce_Stepup
n/applicable
Not a diagnostic
6ms
x
Diag_Debounce_Thresh
Diag_Debounce_Stepup
6ms
x
Diag_Debounce_Thresh
Diag_Debounce_Stepup
2ms
1/DSP
6ms
x
Diag_Debounce_Thresh
Diag_Debounce_Stepup
n/applicable
Not a diagnostic
n/a immediate
Diagnostic
n/a immediate
Diagnostic
n/a immediate
Diagnostic
n/a.
n/a
immediate Diagnostic
n/a
immediate Diagnostic
n/a
immediate Diagnostic
n/a
MLX90367
Rev 5.2
Page 27 of 36
Datasheet
Dec. 15, 15