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AS8579

Functional Description

Datasheet

• PUBLIC

DS000707

• v4-01 • 2022-Jun-08

│ 15

6.1.2

Safety Mechanism Explanation

For checking the thresholds and limits of the Safety Mechanism please refer to 5.4

SM1 Regulator Fail

The safety mechanism Regulator fail is monitoring the voltage on the Regulator.

The sensor provides an error flag REGF=1 in Status Register when the regulator voltage (VREG) is

lower than voltage threshold REGF_L or higher than voltage threshold REGF_H.

SM2 Filter Fail

The safety mechanism Filter fail is monitoring the voltage of the internal Band-pass filter.

The sensor provides an error flag BPFF =1 in Status Register when the input voltage of the internal

Band-pass filter is lower than voltage threshold BPFF_L or higher than voltage threshold BPFF_H.

SM3 Overcurrent on VAR SEN

The safety mechanism Overcurrent on VAR_SEN is monitoring output current of the VAR_SEN driver.

The sensor provides an error flag OCSLD=1in Status Register when the output current of driver higher

than current threshold OCSLDT.

SM4 Overcurrent on SEN

The safety mechanism Overcurrent on SEN is monitoring output current of the sensor driver.

The sensor provides an error flag OCSEN=1in Status Register when the output current of driver higher

than current threshold OCSENT.

SM5 Signature

A signature check is performed on all the OTP content after each OTP reset pulse, this happens also

at power on and after each EDIV update. In case of signature error and until the signature calculation

execution a diagnostic bit OTPF = 1 is latched in the SPI Status Register. The signature bits are

calculated based on the OTP content.

SM6 Out of Range (SEN Lines)

The safety mechanism Out of Range (SEN) is monitoring the voltage on the sensor driver output. The

voltage threshold limits are depending on the configured transmitter voltage (SD_ACx). The sensor

provides an error flag TX1F=1 in Status Register when the driver output voltage (SD_AC1) is lower

than voltage threshold TXF_Lx or higher than voltage threshold TXF_Hx.

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