AMIS-41683_15 Datasheet, PDF (6/16 Pages) ON Semiconductor – Fault Tolerant CAN Transceiver

AMIS−41682, AMIS−41683
Failure 1 : CANH wire interrupted
Vbat Vcc
TxD
RxD
ERR
RTL
CANL
RTL
0.6Vcc
CANL
CL
CD
TxD
RxD
CANH
CANH
CH ^ERR
RTH
0.4Vcc
RTH
Error−detection: CL= CH more then 4 pulses
Failure 2 : CANL wire interrupted
Vbat Vcc
TxD
RxD
ERR
RTL
CANL
RTL
0.6Vcc
CANL
CL
CD
TxD
RxD
CANH
CANH
CH ^ERR
RTH
0.4Vcc
RTH
Error−detection: CL= CH more then 4 pulses
Failure 3 : CANH shorted to Vbat
Vbat Vcc
TxD
RxD
ERR
RTL
CANL
RTL
0.6Vcc
CANL
CL
CD
TxD
RxD
CANH
CANH
CH ^ERR
0.4Vcc
RTH
Vbat
RTH
Error−detection: CANH > 2V longer then Tnd_f3
Failure 3a : CANH shorted to Vcc
Vbat Vcc
RTL
Vcc
RTL
TxD
RxD
ERR
CANL
CANH
0.6Vcc
CANL
CL
CD
TxD
RxD
CANH
CH ^ERR
0.4Vcc
RTH
Vcc
RTH
Error−detection: CANH >2V longer then Tnd_f3
Failure 5 : CANH shorted to Gnd
Vbat Vcc
TxD
RxD
ERR
RTL
CANL
RTL
0.6Vcc
CANL
CL
CD
TxD
RxD
CANH
CANH
CH ^ERR
0.4Vcc
RTH
GND ^RTH
Error−detection: CL= CH more then 4 pulses
Failure 4 : CANL shorted to Gnd
Vbat Vcc
RTL
TxD
RxD
ERR
CANL
CANH
RTH
GND
RTL
0.6Vcc
CANL
CL
CD
TxD
RxD
CANH
CH ^ERR
0.4Vcc
RTH
Error−detection: dominant longer then Tnd_f4
Failure 6 : CANL wire shorted to Vbat
Vbat Vcc
RTL
TxD
RxD
ERR
CANL
CANH
RTH
Vbat
RTL
0.6Vcc
CANL
CL
CD
TxD
RxD
CANH
CH ^ERR
0.4Vcc
RTH
Error−detection: CANL>7V
Failure 6a : CANL shorted to Vcc
Vbat Vcc
RTL
TxD
RxD
ERR
CANL
CANH
RTH
Vcc
RTL
0.6Vcc
CANL
CL
CD
TxD
RxD
CANH
CH ^ERR
0.4Vcc
RTH
Error−detection: CL= CH more then 4 pulses
Failure 7 : CANH shorted to CANL
Vbat Vcc
RTL
TxD
RxD
ERR
CANL
CANH
RTH
RTL
0.6Vcc
CANL
CL
CD
TxD
RxD
CANH
CH ^ERR
0.4Vcc
RTH
Error−detection: dominant longer then Tnd_f7
Figure 4. Different Types of Wiring Failure
Low Power Modes
The transceiver provides three low power modes, which
can be entered and exited via Pins STBB and EN (see
Figure 5). (Go−to−sleep mode is only a transition mode.)
The sleep mode is the mode with the lowest power
consumption. Pin INH is switched to high−impedance for
deactivation of the external voltage regulator. Pin CANL is
biased to the battery voltage via Pin RTL. If the supply
voltage is provided, Pins RXD and ERR will signal the
wake−up interrupt signal.
The standby mode will react the same as the sleep mode
but with a high−level on pin INH.
The power−on standby mode is the same as the standby
mode with the battery power−on flag instead of the wake−up
interrupt signal on Pin ERR. The output on Pin RXD will
show the wake−up interrupt. This mode is only for reading
out the power−on flag.
Wake−up request is detected by the following events:
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