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[v1-01] 2016-Apr-11

AS5170 − Register Description

The FBS setting allows selecting the failure band (lower or

upper) when the output goes into diagnostic mode.

Diagnostic Explanations

For a detailed explanation of the diagnostic and the SPFM

please contact the ams application team for magnetic position

sensor.

Analog Read Fail (SM11)

This safety mechanism operates differently for AS5170A

(analog) and AS5170B (digital):

• For AS5170B readout failure: After a falling edge there

must be a rising edge after a defined time.

In case this is not respected output driver is kept in high

impedance. After a certain time this condition is checked

again.

The readout mechanism for AS5170B is defined by PWMRTH

and PWMFTH, which set the maximum timeout period to wait

for a falling/rising before triggering an error condition,

according to the figures below.

Figure 39:

PWMRTH Conditions

Figure 40:

PWMFTH Conditions

SM13

Signature

No, sensor stays in failure band till the

sensor is resetting

Hi-z: Failure band related to the

out load

SM14

Broken GND

Yes

Hi-z: Failure band related to the

out load

PWMRTH

Delay (

μs)

PWM Read Back rise disabled

24-28

56-60

112-120

PWMFTH

Delay (

μs)

PWM Read Back fall disabled

24-28

56-60

Safety Mechanism

Recoverable

Safe State

AS5170 Datasheet(PDF) 30 Page - ams AG

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