AS8579-ASST datasheet(17/44 Pages) AMSCO

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AS8579

Functional Description

Datasheet

• PUBLIC

DS000707

• v4-01 • 2022-Jun-08

│ 16

SM7 Out of Range (VAR_SEN & FIX_SEN)

The safety mechanism Out of Range (VAR_SEN & FIX_SEN) is monitoring the voltage on the

VAR_SEN and FIX_SEN driver output. The voltage threshold limits are depending on the configured

transmitter voltage (SD_ACx).

The sensor provides an error flag TX2F=1 in Status Register when the driver output voltage

(TXDRV_AC1) is lower than voltage threshold TXF_Lx or higher than voltage threshold TXF_Hx.

Figure 11:

SM6 + SM7 Description

SM8 PGA FAIL 1 (I-channel)

The safety mechanism PGA FAIL 1 is monitoring if the I-channel is getting saturated high or low.

The sensor provides an error flag PGA1F=1 in Status Register when the output voltage of I channel is

lower than voltage threshold PGA1F_L or higher than voltage threshold PGA1F_H.

SM9 PGA FAIL 2 (Q-channel)

The safety mechanism PGA FAIL 2 is monitoring if the Q-channel is getting saturated high or low.

The sensor provides an error flag PGA1F=1 in Status Register when the output voltage of Q channel

is lower than voltage threshold PGA2F_L or higher than voltage threshold PGA2F_H.

SM10 Missing CLK_E Diagnostic

The missing CLK_E diagnostic (NCLK) monitors the system clock MCLK to ensure that it is running

and therefore CLK_E is coming from the microprocessor. If CLK_E is not running or invalid, the NCLK

SD_VDC

TXV=2 : TXF_H2

TXV=1 : TXF_H1

TXV=2 : SD_AC2

TXV=1 : SD_AC1

TXF_MP

TXF_MN

TXV=2 : TXF_L2

TXV=1 : TXF_L1

AS8579-ASST Folha de dados(PDF) 17 Page - ams AG