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Revision 17920-001-10a

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AS8220A

ERRN Signalling

The ERRN signalling is shown in Table 8.

Table 8. ERRN signalling

SUPPLY VOLTAGE FLAG EVENT

HOST COMMAND

STBN

ERRN

Note: ERROR means the logic OR of the error flags

Loss of ground

In case the ground of the device is disconnected and the host pins are open, the bus lines are switched to Idle_HZ.

Error Flags Description

Bus error

The bus error flag is set when 2 consecutive rising edges on the TxD pin without any rising edge on the RxD pin are

detected or when 2 consecutive falling edges on the TxD pin without any falling edge on the RxD pin are detected. This

flag is reset when a rising edge on the TxD pin is followed by a rising edge on RxD pin before of the next TxD rising

edge or when a falling edge on the TxD pin is followed by a falling edge on RxD pin before of the next TxD falling edge.

This flag can be set or reset only in NORMAL mode when the transmitter is enabled. The flag is reset at power off.

Low current on BP high side driver

This flag can only be set/reset in NORMAL mode when the driver is enabled and during the transmission of a stable

driver enable signal then the flag is set otherwise it is reset. The flag is reset at power off.

Low current on BP low side driver

This flag can only be set/reset in NORMAL mode when the driver is enabled and during the transmission of a stable

driver enable signal then the flag is set otherwise it is reset. The flag is reset at power off.

Low current on BM high side driver

This flag can only be set/reset in NORMAL mode when the driver is enabled and during the transmission of a stable

driver enable signal then the flag is set otherwise it is reset. The flag is reset at power off.

Low current on BM low side driver

This flag can only be set/reset in NORMAL mode when the driver is enabled and during the transmission of a stable

driver enable signal then the flag is set otherwise it is reset. The flag is reset at power off.

High current on BP high side driver

This flag can only be set/reset in NORMAL mode when the driver is enabled and during the transmission of a stable

the driver enable signal then the flag is set otherwise it is reset. The flag is reset at power off.

High current on BP low side driver

This flag can only be set/reset in NORMAL mode when the driver is enabled and during the transmission of a stable

the driver enable signal then the flag is set otherwise it is reset. The flag is reset at power off.

L

H

not failure

LL

H

LXL