mc33661 Freescale Semiconductor, Inc, mc33661 Datasheet - Page 15

• Manufacturer Part Number: mc33661
• Description: Local Area Network Lin Enhanced Physical Interface With Selectable Slew Rate
• Manufacturer: Freescale Semiconductor, Inc

Table 5. Explanation of Operational and Transitional Modes State Diagram
RADIATED EMISSION IN NORMAL AND SLOW
MODES
Analog Integrated Circuit Device Data
Freescale Semiconductor
X = Don’t care.
Normal Mode
Note Refer to Table 5 for explanation.
Operational/
Transitional
Sleep Mode
The 33661 has been tested for radiated emission
Wait Slow
Awake
Sleep
Slow
Fast
TXD HIGH and EN LOW to
HIGH
LIN Bus or WAKE Pin
TXD LOW and EN LOW to HIGH
Recessive state, driver off.
20 µA pullup current source.
Recessive state, driver off.
30 kΩ pullup active.
Driver active. 30 kΩ pullup active.
Slew rate normal (20 kbps).
Recessive state. Driver off.
30 kΩ pullup active.
Driver active. 30 kΩ pullup active.
Slew rate slow (10 kbps).
Driver active. 30 kΩ pullup active.
Slew rate fast (> 100 kbps).
Wake-Up
LIN
Figure 15. Operational and Transitional Modes State Diagram
Power-Up
Awake
TXD LOW and EN
LOW to HIGH
ELECTROMAGNETIC COMPATIBILITY
TXD HIGH and EN LOW > t
TXD HIGH and EN LOW > t
TXD HIGH and EN LOW to HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
INH
EN LOW for t
Wait Slow
HIGH
HIGH
HIGH
HIGH
LOW
LOW
EN
HIGH to enter Normal mode.
Once in Normal mode: LOW to
drive LIN bus in dominant, HIGH
to drive LIN bus in recessive.
LOW to enter Slow mode. Once
in Slow mode: LOW to drive LIN
bus in dominant, HIGH to drive
LIN bus in recessive.
LOW to drive LIN bus in
dominant, HIGH to drive LIN bus
in recessive.
2
performances.
frequency range 100 kHz to 2.0 MHz. Test conditions are in
accordance with CISPR25 recommendations, bus length of
1
< 5.0 µs, then HIGH
1 (
TXD HIGH
(35 µs)
35 µs)
LOW
TXD
X
X
1.0 to 20
1.0 to 10
Normal
kbps
Figures 16
Slow
kbps
Toggle Function
Toggle Function
FUNCTIONAL DEVICE OPERATION
and
High impedance. HIGH if external
pullup to V
LOW. If external pullup, HIGH-to-
LOW transition reports wake-up.
Report LIN bus level:
• Low LIN bus dominant
• High LIN bus recessive
Report LIN bus level:
• Low LIN bus dominant
• High LIN bus recessive
Report LIN bus level:
• Low LIN bus dominant
• High LIN bus recessive
17
show the results in the
(10 x)
(10 x)
Fast
Fast
OPERATIONAL MODES
EN LOW for t
then HIGH
EN LOW for t
then HIGH
EN LOW for t
then HIGH
DD.
HIGH
RXD
2
2
2
< 5.0 µs,
< 5.0 µs,
< 5.0 µs,
33661
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