MC33662LEF Datasheet, PDF (25/31 Pages) Freescale Semiconductor, Inc – LIN 2.1 / SAEJ2602-2, LIN Physical Layer

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
transition. This is illustrated in Figure 16 and 19. Once the
wake-up is detected (during the dominant to recessive
transition), the device enters into Awake mode, with INH
HIGH and RXD pulled LOW.
Once in the Awake mode, the EN pin has to be set to 3.3 V
or 5.0 V (depending on the system) to enter into Normal
mode. Once in Normal mode, the device has to wait t_{first_dom}
delay before transmitting the first dominant bit.
Wake-up from EN pin
The device can be waked-up by a LOW to HIGH transition
of the EN pin. When EN is switched from LOW to HIGH and
stays HIGH for a delay higher than t_LWUE, the device is
awakened and enters into Normal mode. See Figure 14 and
FAIL-SAFE FEATURES
The table below describes the 33662 protections.
17. Once in Normal mode, the device has to wait t_{FIRST_DOM}
delay before transmitting the first dominant bit.
Wake-up from WAKE Pin (Awake Transitional Mode)
Just before entering the Sleep mode, the WAKE pin state
is stored. A change in the level longer than the deglitcher time
(70 µs maximum) will generate a wake-up, and the device
enters into the Awake Transitional mode, with INH HIGH and
RXD pulled LOW. See Figure 15 and 18. The device goes
into Normal mode when EN is switched from LOW to HIGH
and stays HIGH for a delay higher than t_LWUE. Once in
Normal mode, the device has to wait t_{FIRST_DOM} delay before
transmitting the first dominant bit.
BLOCK
FAULT
FUNCTIONAL
MODE
CONDITION
RESPONSE
Power Power on Reset
Supply
(POR)
All modes
V_SUP < 3.5 V (min)
then power up
No internal supplies
Normal,
INH high side turned
INH
INH Thermal
Shutdown
Awake &
Preparation to
Temperature >
160 °C (typ)
off. LIN transmitter
and receiver in
Sleep modes
recessive state
V_SUP undervoltage
TXD Pin Permanent
Dominant
Normal
V_SUP < V_UVL
TXD pin low for more
than 5.0 ms (typ)
LIN transmitter in
recessive state
LIN transmitter in
recessive state
LIN
LIN transmitter and
LIN Thermal
Shutdown
Normal mode
Temperature >
160 °C (typ)
receiver in recessive
state
INH high side turned
off
RECOVERY
CONDITION
Condition gone
RECOVERY
FUNCTIONALITY MODE
Device goes in Awake
mode whatever the
previous device mode
Condition gone
Device returns in same
functional mode
Condition gone
Condition gone
Device returns in same
functional mode
Device returns in same
functional mode
Condition gone
Device returns in same
functional mode
Analog Integrated Circuit Device Data
Freescale Semiconductor
33662
25