AS8221

Datasheet - Application In form atio n

www.austriamicrosystems.com/flexray/AS8221

Revision 1.7

20 - 42

Notes:

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 the host pins state and UV 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.

9.2.1 Operating Mode Transitions

Table 7. Transition Table

Transition

Event

Under Voltage Flag

Wake Flag

Host Input

Remarks

Start Point

Destination

STBN

EN

NORMAL

RECEIVE-ONLY

S

L

L

L

X

H

(1) H

L

STANDBY

U

L

L

(1) L

H(2) XLH

H

GO-TO-SLEEP

S

L

L

L

(2) X

L(1) HLH

sleep timer

enabled

SLEEP

U(1) L

HL

L

(2) X

LH

H

U

L

(1) L

H(2) XLH

H

RECEIVE-

ONLY

NORMAL

S

L

L

L

X

H

(1) L

H

STANDBY

S

L

L

L

(2) X

L(1) HLL

UL

L

(1) L

H(2) XLH

L

SLEEP

U(1) L

HL

L

(2) X

LH

L

U

L

(1) L

H

L

(2) X

LH

L

STANDBY

NORMAL

UL

L

(1) H

LL

H

H

WL

L

(2) H

L(1) LHH

H

RECEIVE-ONLY

SL

L

L

X

(1) L

HL

UL

L

(1) H

LL

H

L

WL

L

(2) H

L(1) LHH

L

GO-TO-SLEEP

S

L

L

L

L

L

(1) L

H

sleep timer

enabled

S

L

L

L

H

L

(1) L

H

sleep timer

disabled

UL

L

(1) H

LL

L

H

sleep timer

enabled

WL

L

(2) H

L(1) LHL

H

sleep timer

disabled

SLEEP

U(1) L

HL

L

(2) X

LL

L

U(1) L

HL

H

L

X

X

U

L

(1) L

H

L

(2) X

LL

L

STANDBY

WL

L

(2) X

L(1) LHL

L

UL

L

(1) L

H(2) XLL

L

UL

L

(1) H

LL

L

L

SL

L

H

L

(1) L

HX

S

L

L

H

L

X

(1) L

H