AMIS-4168x

Figure 6: Low Power Modes

STB change state

Power-On Stand-by

High Low

Act

EN change state

STB change state

1) Only when Vcc > POR_Vcc

2) INH active for a time = T_GoToSleep

3) Local Wake-up through pin Wake which change state

for a time > T_wake_min

Remote Wake-up

through pin CANL or CANH when

dominant for a time >TCANH_min or TCANL_min

4) Mode Change through pins STB and EN is only

possible if Vcc > POR_Vcc

STB

ERR

RxD

INH

EN

RTL

POR-

flag

WU-

int

Vbat

Normal Mode

High High Act

STB

ERR

RxD

INH

EN

RTL

Err-

flag

Rec.

out

Vcc

Standby Mode

Low Low

Act

STB

ERR

RxD

INH

EN

RTL

Vbat

GoTo Sleep Mode

Low High

Act

2)

STB

ERR

RxD

INH

EN

RTL

Vbat

Sleep Mode

Low Low

Hz

STB

ERR

RxD

INH

EN

RTL

Vbat

WU-

int

WU-

int

WU-

int

WU-

int

WU-

int 1)

WU-

int 1)

EN change state

EN, STB change state

EN, STB change state

Time-out GoToSleep mode

Local or Remote

Wake-up 3)

Power-On

Mode Change 4)

7.4 Power-on

After power-on (VBAT switched on) the signal on Pin INH will become high and an internal power-on flag will be set. This flag can be

read in the power-on standby mode via pin ERRB (STB-B = 1; EN = 0) and will be reset by entering the normal operating mode.

7.5 Protections

A current limiting circuit protects the transmitter output stages against short circuit to positive and negative battery voltage. If the

junction temperature exceeds a maximum value, the transmitter output stages are disabled and flagged on the ERRB pin. Because the

transmitter is responsible for the major part of the power dissipation, this will result in reduced power dissipation and hence a lower chip

temperature. All other parts of the IC will remain operating.

The Pins CANH and CANL are protected against electrical transients that may occur in an automotive environment.

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