AMIS−41682, AMIS−41683
circuit can still go to another low−power mode. After this
• Local Wake−up: Rising or falling edge on input WAKE
time the circuit goes to the sleep−mode. In case of a wake up
request (from BUS or WAKE Pin) during this transition
time, the wake−up request has higher priority than
go−to−sleepand INH will not be deactivated.
(levels maintained for a certain period).
• Remote Wake−up from CAN Bus: A message with five
consecutive dominant bits.
On a wake−up request the transceiver will set the output
on Pin INH high which can be used to activate the external
supply voltage regulator. Note: Pin INH is also set similarly
Behavior in Case of Missing Supplies
If V is below the threshold level FLAG_V , the signals
CC
CC
as an after wake up event by V
voltage being below the
BAT
on pins STB and EN will internally be set to low-level to
provide fail safe functionality. In this way, a low-power mode
battery power on flag level. (See FLAG_VBAT in Figure 5)
If V is provided, the wake−up request can be read on the
CC
will be forced in case of missing/failing V
supply.
CC
ERR or RXD outputs so the external microcontroller can
wake−up the transceiver (switch to normal operating mode)
via Pins STB and EN.
In the low power modes the failure detection circuit
remains partly active to prevent increased power
consumption in the event of failures 3, 3a, 4, and 7.
The go−to−sleep−mode is only a transition mode. The Pin
INH stays active for a limited time. During this time the
Similarly, missing/failing V
supply – i.e. V
being
BAT
BAT
below FLAG_V
level - will lead to a fail-safe behavior of
BAT
the transceiver by forcing a low-power mode.
A forced low-power in case of missing supplies
guarantees that the transceiver will in no way disturb the
other CAN nodes when the local electronic unit looses
ground or battery connection.
Power−On Stand−by
ERR
STB EN INH
High Low Act
RxD RTL
POR− WU−
flag
Vbat
int
EN change state
EN, STB change state
STB change state
STB change state
Normal Mode
GoTo Sleep Mode
ERR
STB EN INH
High High Act
RxD RTL
ERR
RxD RTL
STB EN INH
Act
2)
Err− Rec.
flag out
WU− WU−
Vcc
Low High
Vbat
int
int
Time−out GoToSleep mode
EN, STB change state
EN change state
Sleep Mode
Standby Mode
ERR
RxD RTL
ERR
STB EN INH
STB EN INH
Low Low Act
RxD RTL
WU− WU−
int
WU− WU−
Local or Remote
Wake−up 3)
Low Low Hz
Vbat
Vbat
int
int 1) int 1)
1) Only when Vcc > POR_Vcc
2) INH active for a time = T_GoToSleep
3) Local Wake−upthrough pin Wake which change state
for a time > T_wake_min
Power−On
Mode Change 4)
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
Figure 5. Low Power Modes
Power−On
After power−on (V
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
ERR (STB = 1; EN = 0) and will be reset by entering the
normal operating mode.
voltage. If the junction temperature exceeds a maximum
value, the transmitter output stages are disabled and flagged
on the ERR 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.
switched on) the signal on Pin INH
BAT
Protections
A current limiting circuit protects the transmitter output
stages against short circuit to positive and negative battery
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