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33903 Datasheet(PDF) 53 Page - Freescale Semiconductor, Inc

Part # 33903
Description  SBC Gen2 with CAN High Speed and LIN Interface
PDF  104 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33903 Datasheet(HTML) 53 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
53
33903/4/5
FAIL SAFE OPERATION
BEHAVIOR AT POWER UP AND POWER DOWN
SAFE Mode B1, B2 and B3 Illustration
Figure 34 illustrates the event, and consequences when SAFE Mode B1, B2, or B3 is selected via the appropriate debug
resistor or SPI configuration.
DBG resistor => safe state B1
VDD
RST
SAFE
CAN bus
CAN bus idle time
I/O-1
I/O-1 high to low transition
DBG resistor => safe state B2
DBG resistor => safe state B3
CAN bus
CAN bus idle time
I/O-1
I/O-1 high to low transition
step 2:
RST
VDD
failure event, i.e. watchdog
SAFE
OFF state ON state
8 x 256 ms delay time to enter in SAFE Mode
to evaluate resistor at the DBG pin
and monitor ECU external events
1st
8th
2nd
step 1: Failure illustration
RST
VDD
failure event, VDD low
SAFE
OFF state ON state
100 ms delay time to enter in SAFE Mode
to evaluate resistor at DBG pin
and monitor ECU external events
VDD_UV TH
100 ms
GND
RST
VDD
failure event, Reset s/c GND
SAFE
OFF state
ON state
100 ms deglitcher time to activate SAFE and
enter in SAFE Mode to evaluate resistor at DBG pin
and monitor ECU external events
2.5 V
100 ms
VDD
RST
SAFE
VDD OFF
RST
SAFE
VDD
If VDD failure recovered
VDD < VDD_UV TH
VDD OFF
GND
step 3: Consequences for VDD
If Reset s/c GND recovered
Behavior illustration for the safe state B (RDG > 10 kohm)
ECU external event to
RDBG resistor or
disable VDD based on
SPI configuration
Exclusive detection of
Figure 34. SAFE Modes B1, B2, or B3 Behavior Illustration



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