AS8221

Datasheet - Application In form atio n

www.austriamicrosystems.com/flexray/AS8221

Revision 1.4

21 - 41

Note:

S = transition forced via EN, STBN; U = transition forced via undervoltage or voltage recovery; W = transition forced via WAKE

(1) Indicates the action, that initiates the transition

(2) Indicates the consequence after performed transition

(3) In case the wake flag is set, it is not possible to enter SLEEP mode through a Sleep command, requested by the host.

GO-TO-SLEEP

NORMAL

S

L

L

L

X

(1) L

→HH

STANDBY

S

L

L

L

X

L

(1) H

→L

UL

L

(1) L

→H(2) X→LL

H

SLEEP

SL

L

L

L

L

H

t

U(1) L

→HL

L

(2) X

→LL

H

U

L

(1) L

→H

L

(2) X

→LL

H

GO-TO-SLEEP

W

L

L

L

(1) L

→HL

H

sleep timer

disabled

SLEEP

NORMAL

SL

L

L

L

(1) L

→HH

W(2) X

→L(2) X→L(2) X→L(1) L→HH

H

U

L

(1) H

→LL

L

H

H

U(1) H

→LL

L

L

H

H

RECEIVE-ONLY

SL

L

L

L

(1) L

→HL

W(2) X

→L(2) X→L(2) X→L(1) L→HH

H

U

L

(1) H

→LL

L

H

L

U(1) H

→LL

L

L

H

L

STANDBY

W(2) X

→L(2) X→L(2) X→L(1) L→HL

L

U

L

(1) H

→LL

L

L

L

U(1) H

→LL

L

L

L

L

U(1) H

→LL

H

L

X

X

GO-TO-SLEEP

W(2) X

→L(2) X→L(2) X→L(1) L→HL

H

sleep timer

disabled

U

L

(1) H

→LL

L

L

H

sleep timer

disabled

U(1) H

→LL

L

L

L

H

sleep timer

disabled

SLEEP

S

X

X

X

L

X

(1) L

↔H

SH

L

X

L

(1) L

↔HX

SL

H

L

L

(1) L

↔HX

SH

H

L

L

(1) L

↔HX

U

X

(1) L

→HL

L

X

X

U(1) L

→HX

X

L

X

X

UL

L

(1) L

↔HL

X

X

Table 7. Transition Table

Transition

Event

Under Voltage Flag

Wake Flag

Host Input

Remarks

Start Point

Destination

STBN

EN