MLX90316KDC-BDG Datasheet, PDF (28/45 Pages) Melexis Microelectronic Systems – Rotary Position Sensor IC

MLX90316
Rotary Position Sensor IC
15. MLX90316 Self Diagnostic
The MLX90316 provides numerous self-diagnostic features. Those features increase the robustness of the IC
functionality as it will prevent the IC to provide erroneous output signal in case of internal or external failure
modes (“fail-safe”).
ROM CRC Error at start up
(64 words including Intelligent
Watch Dog - IWD)
ROM CRC Error (Operation -
Background task)
RAM Test Fail (Start up)
Action
CPU Reset ⁽²²⁾
Enter Endless Loop:
- Progress (watchdog
Acknowledge)
- Set Outputs in Diagnostic low
CPU Reset
Effect on Outputs
Diagnostic low⁽²³⁾
Immediate Diagnostic low
Diagnostic low
Calibration Data CRC Error
(Start-Up)
Hamming Code Recovery
Hamming Code Recovery Error
(Start-Up)
Calibration Data CRC Error
(Operation - Background)
Dead Zone
ADC Clipping
(ADC Output is 0000h or
7FFFh)
Radius Overflow ( > 100% ) or
Radius Underflow
( < 50 % )
Fine Gain Clipping
(FG < 0d or > 63d)
Rough Offset Clipping
(RO is < 0d or > 127d)
CPU Reset
CPU Reset
Set Outputs in Diagnostic low.
Normal Operation until the “dead
zone” is left.
Set Outputs in Diagnostic low
Normal mode and CPU Reset If
recovery
Set Outputs in Diagnostic low
Normal mode and CPU Reset If
recovery
Set Outputs in Diagnostic low
Normal mode, and CPU Reset If
recovery
Set Outputs in Diagnostic low
Normal mode, and CPU Reset If
recovery
Rough Gain Clipping
Set Outputs in Diagnostic low
(RG < RGTHRESLOW or RG > Normal mode, and CPU Reset If
RGTHRESHIGH)
recovery
DAC Monitor (Digital to Analog
converter)
Set Outputs in Diagnostic low.
Normal Mode with immediate
recovery without CPU Reset
MLX90316 Fault Mode continues…
Immediate Diagnostic low
Immediate Diagnostic low
Immediate Diagnostic low
Immediate Diagnostic low
Immediate Diagnostic low
Immediate Diagnostic low
Immediate Diagnostic low
Immediate Diagnostic low
Immediate Diagnostic low
22 _{CPU reset means}
1. _{Core Reset (same as Power-On-Reset). It induces a typical start up time.}
2. _{Periphery Reset (same as Power-On-Reset)}
3. _{Fault Flag/Status Lost}
4. _{The reset can be disabled by clearing the RESONFAULT bit (See 14.6.1)}
23 _{Refer to section 7 for the Diagnostic Output Level specifications}
Remark
All the outputs are already
in Diagnostic low - (start-up)
All the outputs are already
in Diagnostic low (start-up)
Start-Up Time is increased
by 3 ms if successful
recovery
See 14.6.2
Immediate recovery if the
“dead zone” is left
(50 % - 100 %)
No magnet / field too high
See also 14.4.2
See also 14.4.2
3901090316
Rev10
Page 28 of 45
Jul/13