AMIS-4168X Datasheet, PDF (9/20 Pages) AMI SEMICONDUCTOR – Fault Tolerant CAN Transceiver

AMIS-4168x
EN change state
Power-On Stand-by
STB EN INH ERR RxD RTL
High Low
Act
POR-
flag
WU-
int
Vbat
EN, STB change state
Normal Mode
STB EN INH ERR RxD RTL
High High Act
Err-
flag
Rec.
out
Vcc
STB change state
STB change state
GoTo Sleep Mode
STB EN INH ERR RxD RTL
Low High
Act
2)
WU-
int
WU-
int
Vbat
Time-out GoToSleep mode
EN, STB change state
Standby Mode
STB EN INH ERR RxD RTL
Low Low
Act
WU-
int
WU-
int
Vbat
EN change state
Local or Remote
Wake-up 3)
1) Only when Vcc > POR_Vcc
Power-On
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
Sleep Mode
STB EN INH ERR RxD RTL
Low Low
Hz
WU-
int 1)
WU-
int 1)
Vbat
Mode Change 4)
Figure 6: Low Power Modes
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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