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AS8650

Datasheet - Detailed Descr i p ti on

Figure 11. Wake Message Pattern

7.13 Internal Flags

The AS8650 supports internal flags to indicate the failures in the system. If any of these flag is set an interrupt is generated on INTN pin.

7.13.1 VSUP_UV_flag

This is a VSUP undervoltage flag. This flag is set when VSUP falls below the VSUP_UVTH threshold. When this flag is set the device enters into

standby mode and BUS Transceiver is switched off to save power. When VSUP recovers and raises above VSUP_POKTH threshold the

VSUP_UV_flag is reset.

7.13.2 VSUP_POK_flag

This is a VSUP power ok flag. This indicates the VSUP recovery from undervoltage condition. When the VSUP rises above VSUP_POKTH

threshold, this flag is set. This indicates the microcontroller that undervoltage condition on battery is cleared.

7.13.3 V5V_UV_flag

This is a V5V undervoltage flag. This flag is set when V5V falls below the V5V_UVTH threshold. When this flag is set the device enters into

Standby mode and BUS Transceiver is switched off to save power. When V5V recovers and raises above V5V_POKTH threshold the

V5V_UV_flag is reset.

7.13.4 V5V_POK_flag

This is a V5V power ok flag. This indicates the V5V recovery from undervoltage condition. When the V5V rises above V5V_POKTH threshold,

this flag is set. This indicates the microcontroller that undervoltage condition on DCDC converter is cleared.

7.13.5 VLDO2_UV_flag

This is a VLDO2 undervoltage flag. This flag is set when VLDO2 falls below the VLDO2_UVTH threshold. When VLDO2 recovers and raises

above VLDO2_POKTH threshold the VLDO2_UV_flag is reset.

7.13.6 VLDO2_POK_flag

This is a VLDO2 power ok flag. This indicates the VLDO2 recovery from undervoltage condition. When the VLDO2 rises above VLDO2_POKTH

threshold this flag is set. This indicates the microcontroller that undervoltage condition on LDO2 is cleared.

7.13.7 VLDO3_UV_flag

This is a VLDO3 undervoltage flag. This flag is set when VLDO3 falls below the VLDO3_UVTH threshold. When VLDO3 recovers and raises

above VLDO3_POKTH threshold the VLDO3_UV_flag is reset.

7.13.8 VLDO3_POK_flag

This is a VLDO3 power ok flag. This indicates the VLDO3 recovery from undervoltage condition. When the VLDO3 rises above VLDO3_POKTH

threshold this flag is set. This indicates the microcontroller that undervoltage condition on LDO3 is cleared.

7.13.9 BUS Wake_up Flag

The BUS Wake_up flag is set when the device detects a remote wake-up (BUS message) request. The remote wake-up request is detected

when pattern shown in Figure 11 is found on wake_remote port of low power receiver. This indicates the microcontroller about the Bus wake

event.

WAKE_remote

CANH

CANL

WAKE_remote_flag

Remote wake

detected

Dominant

Reccessive

Dominant

Reccessive