MLX90366

Triaxis



Position Sensor Assembly feat. SENT

MLX90366

Page 26 of 34

Datasheet

Rev. 1.0

25/Jun/13

15.

MLX90366 Self Diagnostic

The MLX90366 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 exter

nal failure modes (“fail-safe”).

Diagnostic Item

Action

Effect on Output

Type

Monitoring Rate

Reporting Rate

ST-up phase Diagnostics

RAM March C- 10N Test

Fail-safe mode **

** CPU reset after 120ms

Diagnostic low/ high

Reporting (optional)

Digi HW

n/applicable

(start-up only)

n/applicable (start-up

only)

Watchdog BIST

Fail-safe mode **

** CPU reset after 120ms

Diagnostic low/ high

Reporting (optional)

Digi HW

n/applicable

(start-up only)

n/applicable (start-up

only)

Under Voltage Monitoring

SUPPLYMONI =

(MT3VB) OR (MT4VB)

St-up on Hold

Diagnostic low/high

Environ

&Analog

n/applicable

(start-up only)

n/applicable (start-up

only)

Over Voltage Monitoring

MT7V

PTC entry

OUT in HiZ

Environ

n/applicable

(start-up only)

n/applicable (start-up

only)

BG Loop Diag.

ROM 16bit checksum

( continuous )

Fail-safe mode **

** CPU reset after 120ms

Diagnostic low//high

Reporting (optional)

Digi HW

800ms

800ms

EEPROM 8 bit CRC Check

(continuous)

Fail-safe mode **

** CPU reset after 120ms

Diagnostic low/high

Reporting (optional)

Digi HW

10ms

10ms

Watchdog

( continuous )

CPU reset

--

Digi HW

120ms

n/a

DSP Loop Diag.

ADC Clipping

ADCCLIP

Debouncing (prog.)

SENT Status bit0 = 1

(optional)

Environ

&Analog

5/DSP

6ms x

INT (THRES/STEP_UP)

Virtual Gain Code Out-of-spec

GAINOOS

Debouncing (prog.)

SENT Status bit0 = 1

(optional)

Environ

&Analog

1/DSP

6ms x

INT (THRES/STEP_UP)

Virtual Gain Code Saturation

[GAINMIN..GAINMAX]

Saturation (optional)

Gain Saturated @ GAINMIN-

GAINMAX

Environ

&Analog

n/applicable

Not a diagnostic

n/applicable

Not a diagnostic

ADC Monitor (Analog to Digital

Converter)

ADCMONI

Debouncing (prog.)

SENT Status bit0 = 1

(optional)

Analog

HW

1/DSP

6ms x

INT (THRES/STEP_UP)

Under Voltage Monitoring

SUPPLYMONI =

(MT3VB) OR (MT4VB)

Supply Debouncing (prog.)

SENT Status bit0 = 1

(optional)

Environ

&Analog

1/DSP

6ms x

INT (THRES/STEP_UP)

Over Voltage Monitoring

MT7V

PTC entry after PTC

Debouncing

OUT in HiZ

Environ

2ms

2ms

Temperature Sensor Monitor

TEMPMONI

Debouncing (prog.)

SENT Status bit0 = 1

(optional)

Analog

1/DSP

6ms x

INT (THRES/STEP_UP)

Temperature > 170degC (

 20)

Temperature < -60degC (

 20)

Saturate value used for the

compensation to -40degC and

+150degC resp.

No effect

Environ

&Analog

n/applicable

Not a diagnostic

Hardware Diag. ( continuously checked by dedicated Logic )

Read/Write Access out of

physical memory

Fail-safe mode **

** CPU reset after 120ms

Diagnostic Low/High

Digi HW

n/a

immediate Diag

n/a

immediate Diag

Write Access to protected area

(IO and RAM Words)

Fail-safe mode **

** CPU reset after 120ms

Diagnostic low/high

Digi HW

n/a

immediate Diag.

n/a

immediate Diag.

Unauthorized Mode Entry

Fail-safe mode **

** CPU reset after 120ms

Diagnostic low/high

Digi HW

n/a

immediate Diag

n/a

immediate Diag

EEPROM Error Correcting

Code ( Hamming correction )

(Transparent) Error Correction

no effect

Digi HW

n/a.

n/a

Hardware Diag. ( continuously checked by dedicated Analog circuits )

Broken VSS

CPU Reset

on recovery

Pull down load => Diag. Low

Pull up load => Diag. High

Environ

n/a

immediate Diag.

n/a

immediate Diag.

Broken VDD

CPU Reset

on recovery

Pull down load => Diag. Low

Pull up load => Diag. High

Environ

n/a

immediate Diag

n/a

immediate Diag

Resistive Cable Test

St-up on Hold

Diagnostic low/high

Environ

n/a

immediate Diag.

n/a

immediate Diag.