MCZ33905BS3EK Freescale Semiconductor, MCZ33905BS3EK Datasheet - Page 53

• Manufacturer Part Number: MCZ33905BS3EK
• Description: IC SBC CAN HS 3.3V 32SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33905BS3EK

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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