MC33661PEF 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC33661PEF

Local Interconnect Network (LIN) Enhanced Physical Interface with Selectable Slew Rate

Freescale Semiconductor 

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Power-up

TXD High and EN Low to

High

TXD High and EN Low > t1 (35 s)

Fast

(10 x)

Toggle Function EN Low for t2 < 5.0 s,

then High

LIN Bus or WAKE Pin

Wake-up

Sleep

Awake

TXD High and EN Low to High

Normal

1.0 to 20

kbps

EN Low for t2 < 5.0 s,

then High

TXD Low and EN

Low to High

TXD Low and EN Low to High

Wait Slow

TXD High

TXD High and EN Low > t1 (35 s)

Slow

1.0 to 10

kbps

EN Low for t2 < 5.0 s,

then High

Toggle Function

Note Refer to Table 5 for explanation.

EN Low for t2 < 5.0 s, then High

Fast

(10 x)

Figure 15. Operational and Transitional Modes State Diagram

Table 5. Explanation of Operational and Transitional Modes State Diagram

Operational/

Transitional

LIN

INH

EN

Sleep Mode Recessive state, driver off. 20 A Low

Low

pull-up current source.

Awake

Recessive state, driver off. 30 k High

Low

pull-up active.

TXD

X

X

RXD

High-impedance. High if external

pull-up to VDD.

Low. If external pull-up, High-to-

Low transition reports wake-up.

Normal Mode

Driver active. 30 k pull-up

active. Slew rate normal

(20 kbps).

High

High

High to enter Normal mode. Once

in Normal mode: Low to drive LIN

bus in dominant, High to drive

LIN bus in recessive.

Report LIN bus level:

• Low LIN bus dominant

• High LIN bus recessive

Wait Slow Recessive state. Driver off. 30 k High

High

Low

pull-up active.

High

Slow

Driver active. 30 k pull-up

High

active. Slew rate slow (10 kbps).

High

Low to enter Slow mode. Once in

Slow mode: Low to drive LIN bus

in dominant, High to drive LIN

bus in recessive.

Report LIN bus level:

• Low LIN bus dominant

• High LIN bus recessive

Fast

Driver active. 30 k pull-up

active. Slew rate fast

(>100 kbps).

High

High

Low to drive LIN bus in dominant, Report LIN bus level:

High to drive LIN bus in

• Low LIN bus dominant

recessive.

• High LIN bus recessive

X = Don’t care.

Analog Integrated Circuit Device Data

Freescale Semiconductor

33661

15

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