AS8222 datasheet(28/43 Pages) AMSCO

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AS8222

Datasheet - Detailed Descr i p ti on

www.ams.com/eng/FlexRay/AS8222

Revision 1.0

27 - 42

7.11.1 Error Pin Signalling

In Table 20 the signaling at the Error Not (ERRN) pin is shown.

7.12 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.

7.13 ERROR Flags Description

All error flags are reset after error readout is completed (see Section 7.15) or in POWER-OFF mode.

7.13.1 Undervoltage Detected VBAT Flag

This flag is set if an undervoltage event at VBAT is detected. This flag signals if undervoltage was detected but will not initiate a mode change.

7.13.2 Undervoltage Detected VIO Flag

This flag is set if an undervoltage event at VIO is detected. This flag signals if undervoltage was detected but will not initiate a mode change.

7.13.3 Undervoltage Detected VCC Flag

This flag is set if an undervoltage event at VCC is detected. This flag signals if undervoltage was detected but will not initiate a mode change.

7.13.4 Bus Error

The bus error flag is set, after a time tBUS_INHIB while the driver is enabled and activated until the end of the frame if



2 consecutive rising edges at the TxD pin without any rising edge at the RxD pin are detected, or



2 consecutive falling edges at the TxD pin without any falling edge at the RxD pin are detected.

The flag is only set in NORMAL mode.

7.13.5 Bus Open Line

BP open line can only be set in NORMAL mode if the driver is enabled. The flag is set if the absolute current through BP or BM is lower than ITHL

for a time longer than tBUS_ERROR. The flag is meaningful only if no short circuit flag is set.

7.13.6 BP Short Circuit to VCC

BP short circuit to VCC can only be set in NORMAL mode if the driver is enabled. The flag is set if the absolute current flowing through BP is

higher than ITHH during transmission of Data0 for a time longer than tBUS_ERROR.

Table 20. Error Not (ERRN) Signalling

Supply undervoltage Flag at

VBAT, VIO, VCC

Remote Wake

Flag

Local Wake

Flag

Host Command

ERRN

STBN

NOT [Error flag]

↑

(positive edge)

→ NOT [Error flag]

↑

(positive edge)

→ NOT [Error flag]

↑

(positive edge)

→ L

↑

(positive edge)

→ L

↑

(positive edge)

↑

(positive edge)

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