AS8222 datasheet(29/43 Pages) AMSCO

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AS8222

Datasheet - Detailed Descr i p ti on

www.ams.com/eng/FlexRay/AS8222

Revision 1.0

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7.13.7 BP Short Circuit to GND

BP short circuit to GND 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 Data1 for a time longer than tBUS_ERROR.

7.13.8 BM Short Circuit to VCC

BM 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 BM is

higher than ITHH during transmission of Data1 for a time longer than tBUS_ERROR.

7.13.9 BM Short Circuit to GND

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

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

7.13.10 Short Circuit between BP and BM

The flag is set if, after a time tBUS_INHIB while the driver is enabled and active until the end of the current FlexRay frame and the absolute

differential bus voltage is lower than VSHORT.

7.13.11 Over-temperature

This flag can only be set and reset in the non-low-power modes. The flag is set if the junction temperature exceeds OTTH and is reset if the

junction temperature falls below OTTL.

7.13.12 TxEN_BGE Timeout

This flag can only be set in NORMAL mode if the driver is enabled (TxEN is low and BGE is high) for a time longer than tTxEN_max. It is reset after

every status change at TxEN or BGE or if the device exits NORMAL mode. In case the flag is set the driver is disabled.

7.13.13 Error Flag

This flag is set if at least one error flag (as listed below) is set, except undervoltage VBAT, VIO and VCC (refer to sections 7.13.1, 7.13.2 &

7.13.3). The error flag is reset if none of the flags are set.

Note: The error flag is signalled on ERRN pin according to Table 20.

7.14 STATUS Flags Description

7.14.1 Local and Remote Wake Flag

Local and remote flags and function are described in Section 7.7 Wake-Up Events.

7.14.2 Power on Flag

The power on flag is set leaving the POWER-OFF state and it is reset entering a low-power mode after a non-low-power mode.

7.14.3 BGE Status

The BGE status flag is set if BGE is high and is reset if BGE is low. The state of the BGE is latched at the beginning of the readout cycle.

Table 21. Functional Blocks

Section No.

Flag Name

7.13.4

Bus Error

7.13.5

Bus Open Line

7.13.6

BP Short Circuit to VCC

7.13.7

BP Short Circuit to GND

7.13.8

BM Short Circuit to VCC

7.13.9

BM Short Circuit to GND

7.13.10

Short Circuit between BP and BM

7.13.11

Over-temperature

7.13.12

TxEN_BGE Timeout

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