AS8222

Datasheet - Detailed Descr i p ti on

www.ams.com/eng/FlexRay/AS8222

Revision 1.0

25 - 42

Table 18. Pin Signalling in Operating Modes

Inputs

Operation Mode

Outputs

STBN

EN

RxD

RxEN

INH1

INH2

HH

NORMAL

L

Bus = Data_0

L

Bus = Active

HH

H

Bus = Idle or Data_1

H

Bus = Idle

H

L

RECEIVE-ONLY

L

Bus = Data_0

L

Bus = Active

HH

H

Bus = Idle or Data_1

H

Bus = Idle

LH

GO-TO-SLEEP

1

NOT [Wake-up flag]

NOT [Wake-up flag]

H

Floating

2

L

L

STANDBY

NOT [Wake-up flag]

NOT [Wake-up flag]

H

Floating

2

LX

SLEEP

3

NOT [Wake-up flag]

NOT [Wake-up flag]

Floating

Floating

remain in GO-TO-SLEEP.

2. If wake-up flag is set INH2=H otherwise INH2=floating.

3. Starting from SLEEP, if the wake-up flag is set, the device enters STANDBY regardless of the host pins state and undervoltage flags.

Starting from SLEEP, if the wake up flag is not set, the only operating mode that can be entered through host pins are the non-low-power

modes.

Note: “H” = Digital level high; “L” = Digital level low; “X” = Don’t care; “Floating” = the analog output is not driven.

Table 19. Mode Transitions

Initial Mode

Supply Undervoltage Flag / Event

Wake Flag

Host Event

Next Mode

STBN

EN

NORMAL

L

L

L

X

H

H

→L

RECEIVE-ONLY

L

L

L

X

H

→LH→L

STANDBY

LL

L

→H

XXX

LL

L

X

H

→L

H

GO-TO-SLEEP

L

→ H

L

XXXX

SLEEP

XL

→ H

L

XXX

RECEICVE-ONLY

LL

L

X

H

L

→ HNORMAL

LL

L

X

H

→ LL

STANDBY

LL

L

→ H

XXX

L

→ H

L

XXXX

SLEEP

XL

→ H

L

XXX