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AS8579

Functional Description

Datasheet

• PUBLIC

DS000707

• v4-01 • 2022-Jun-08

43

│ 14

6.1

Diagnostics

6.1.1

Safety Mechanism Overview

Figure 10:

Safety Mechanism Overview

SM

Diagnostic Name

Description/Safe State

Status

Flag

Blanking

SM1

Regulator Fail

Low voltage or high voltage detected on

3.3 V regulator

REGF=1

Blanking

not needed

SM2

Filter Fail

Voltage on internal bandpass filter is out

of range

BPFF=1

Blanking

required(1)

SM3

Overcurrent on

VAR SEN

Overcurrent condition on the VAR_SEN

Driver

OCSLD=1

Blanking

required(1)

SM4

Overcurrent on

SEN

Overcurrent condition on the sensor driver

OCSEN=1

Blanking

required(1)

SM5

Signature

Signature calculation error of OTP

content.

OTPF=1

Blanking

not needed

SM6

Out of Range

(SEN Lines)

Sensor driver output voltage outside

operating range

TX1F=1

Blanking

required(1)

SM7

Out of Range

(VAR _SEN)

Shield driver output voltage outside

operating range

TX2F=1

Blanking

required(1)

SM8

PGA FAIL 1 (I-

Path)

I - Channel is saturated high or low

PGA1F=1

Blanking

required(1)

SM9

PGA FAIL 2 (Q-

Path

Q - Channel is saturated high or low

PGA2F=1

Blanking

required(1)

SM10

NCLK

CLK_E is missing or is invalid.

NCLK=1

Blanking

not needed

SM11

CBF

Internal current buffer output is out of

range - high or low.

CBF=1

Blanking

required(1)

SM12

PPSF

Pin to Pin short diagnostic for MUX

controlled outputs (SEN lines)

PPSF=1

Blanking

not needed

(1)

This signal requires to be synchronized and filtered to avoid a certain spike in MCLK domain. This signal must st

ay at ‘1’

for at least some MCLK cycles. The number of MCLK cycles is specified by the BLANK register (0x2B/0x3B). For this

refer to 6.1.3