AS5170 datasheet(29/47 Pages) AMSCO

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ams Datasheet

Page 29

[v1-01] 2016-Apr-11

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AS5170 − Register Description

Diagnostic

AS5170A/AS5170B can be used in safety critical applications.

For this reason,AS5170A/AS5170B is developed as SEooC

(Safety element out of context) according the ISO26262.

The assumption of use (AoU) and the robust embedded

self-diagnostic, to achieve a high ASIL level in the application.

For additional information regarding the ISO26262 flow at ams

and the SEooC relevant documents (e.g. FMEDA, safety manual,)

please contact the ams technical support for magnetic position

sensors.

Figure 38:

Diagnostic Table

Safety Mechanism

Recoverable

Safe State

SM1

Watchdog failure

No, if a watchdog error is detected, the

sensor provides the error information

till a sensor reset happens

Output is going into HIZ -->

failure band (depending on

output resistor)

SM2

Offset compensation

not complete

Yes, if the offset is below the specified

threshold, sensor recovers the output

Output is forced in failure band.

Depending on FBS setting

SM3

CORDIC overflow

Yes, if the magnetic input field is below

the specified threshold, sensor

recovers the output

Output is forced in failure band.

Depending on FBS setting

SM4

Magnetic input field

too high/too low

Yes, if the magnetic field is inside the

specific range, after the recovery time

the sensor leave the failure

Output is forced in failure band.

Depending on FBS setting

SM5

Vreg undervoltage

Yes

Hi-z: Failure band related to the

out load

SM6

Reverse polarity

Yes, if reverse polarity issue is solved.

No direct safety mechanism, it’s a

protection!

Hi-z: Failure band related to the

out load

SM7

VDD overvoltage

Yes, if the VDD is below the specified

threshold.

Hi-z: Failure band related to the

out load

SM8

VDD undervoltage

Yes, if the VDD is above the specified

threshold

Hi-z: Failure band related to the

out load

SM9

Broken VDD

Yes

Hi-z: Failure band related to the

out load

SM10

ADC check

No, sensor stays in failure band till the

Sensor is resetting.

Hi-z: Failure band related to the

out load

SM11

Analog read fail

Yes

Hi-z: Failure band related to the

out load

SM12

Short circuit

Yes

Hi-z: Failure band related to the

out load

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