mc33902 Freescale Semiconductor, Inc, mc33902 Datasheet - Page 16

• Manufacturer Part Number: mc33902
• Description: High Speed Can Interface With Embedded 5.0 V Supply
• Manufacturer: Freescale Semiconductor, Inc

P_SPI reading.
WAKE Pin - Local Wake-up (WU)
set if a transition on the WAKE pin is detected. This wake-up
is reported on the ERR pin by a low level in Standby mode,
as well as in Sleep mode if VIO is present.
or by P_SPI reading.
Wake-up Source
Normal mode, before 4 TX pulses. The ERR pin is low to
indicate a local wake-up, and high to indicate CAN wake-up.
Local Failure
dominant clamping, RXD recessive clamping, TXD-to-RXD
short-circuit and VDD low condition. This flag is reported in
Listen Only on the ERR pin coming from Normal mode.
information.
BUS Failure
a bus line short-circuit condition to VSUP, VDD, or GND,
during five consecutive dominant-recessive cycles on the
TXD pin. In addition, this flag reports a bus dominant
clamping condition. In Normal mode, the bus failure flag is
available on the ERR pin.
16
33902
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 6. “Static” Diagnostic Flags
The flag is cleared by leaving the Normal mode or by a
From the Standby, Go To Sleep or Sleep mode, this flag is
The wake-up flag is cleared by leaving the Normal mode
Wake-up source is reported on the ERR pin by entering
This flag is a logic «OR» of the following failures: TXD
Using the P_SPI, it is possible to get detailed failure
The BUS failure flag is set if the CAN transceiver detects
CANWU or Local WU
Evaluation mode
Wake-up source
Local Failure
BUS Failure
BATFAIL
V
Flag
DD
low
Normal mode (Before the fourth dominant to recessive edge on the
Normal mode (After the fourth dominant to recessive edge on the
Normal mode (After the fourth dominant to recessive edge on the
By RXD low, when coming from Sleep or Standby into Normal or
Listen-Only mode (coming from Standby, Go-to-Sleep, Sleep)
TXD pin) and Listen Only mode (coming from Normal mode)
Standby, Go-to-Sleep, Sleep (provided VIO is present)
Listen Only mode (coming from Normal mode)
Listen Only modes.
Accessibility
TXD pin)
TXD pin)
information.
VDD low
V
t
t
discharge.
will not be disabled if V
above V
so the user can differentiate between local and bus failures
by changing modes and observing ERR staying low.
same time, the results will be the same: ERR low in Normal
and in Listen Only mode. However, this is unlikely to occur.
is above V
above V
pulse illustration).
threshold. (refer to crank pulse illustration).
ERR Pin
the device state, the device state transition, and event on the
TXD pin.
device is controlled in a static manner.
VDD-CANOFF
VDDOFF
DD
Using the P_SPI, it is possible to get detailed failure
V
If the CRANK bit is set high, the V
V
In case of a double failure (local and bus failure) at the
This flag is cleared when entering low power, or when V
The V
The CAN is re-enabled as soon as V
The ERR pin reports various information depending upon
Table 6
DD
DD
is below the V
low flag is set in Normal and Listen Only mode when
low flag is reported in Normal and Listen Only mode,
, the V
SUV
SUP
DD
DD
shows the diagnostic flag availability when the
, the CRANK bit has no effect.
regulator is re enabled as soon as V
, the CAN is disabled and after a time longer than
low, or by a mode change (refer to the crank
RXD goes from low to high, to signal the device is ready
and has exited low power modes (TLP-NP parameter).
low threshold, plus the P_SPI reading.
DD
Entering Normal mode or TXD high while RXD low.
Leaving Normal mode, or by setting BATFAIL flag.
Leaving Normal mode or by setting the BATFAIL
regulator is disabled to avoid a battery
DD
low threshold. After a time longer than
Analog Integrated Circuit Device Data
SUP
Clearing Diagnostic
Re-entering Normal mode
V
Leaving Normal mode
DD
is below V
> V
DD
low threshold
Freescale Semiconductor
DD
SUV
DD
regulator and CAN
. When V
is above V
SUP
SUP
rises
DD
is
low
DD