33661 datasheet(15/21 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33661

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Figure 15. Operational and Transitional Modes State Diagram

ELECTROMAGNETIC COMPATIBILITY

RADIATED EMISSION IN NORMAL AND SLOW

MODES

The 33661 has been tested for radiated emission

performances. Figures 16 and 17 show the results in the

frequency range 100 kHz to 2.0 MHz. Test conditions are in

accordance with CISPR25 recommendations, bus length of

Table 5. Explanation of Operational and Transitional Modes State Diagram

Operational/

Transitional

LIN

INH

TXD

RXD

Sleep Mode

Recessive state, driver off.

µA pullup current source.

LOW

High impedance. HIGH if external

pullup to VDD.

Awake

Recessive state, driver off.

30 k

Ω pullup active.

HIGH

LOW

LOW. If external pullup, HIGH-to-

LOW transition reports wake-up.

Normal Mode

Driver active. 30 k

Ω pullup active.

Slew rate normal (20 kbps).

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

Ω pullup active.

HIGH

LOW

HIGH

Slow

Driver active. 30 k

Ω pullup 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

Ω pullup active.

Slew rate fast (> 100 kbps).

HIGH

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

X = Don’t care.

Power-Up

Sleep

Awake

Wait Slow

Normal

Fast

TXD HIGH and EN LOW > t1 (35 µs)

TXD HIGH and EN LOW to

LIN Bus or WAKE Pin

TXD HIGH and EN LOW to HIGH

TXD LOW and EN LOW to HIGH

TXD LOW and EN

TXD HIGH and EN LOW > t1 (35 µs)

TXD HIGH

EN LOW for t2 < 5.0 µs, then HIGH

Wake-Up

LOW to HIGH

Toggle Function

EN LOW for t2 < 5.0 µs,

Toggle Function

then HIGH

EN LOW for t2 < 5.0 µs,

then HIGH

EN LOW for t2 < 5.0 µs,

then HIGH

Note Refer to Table 5 for explanation.

HIGH

(10 x)

Fast

(10 x)

1.0 to 20

kbps

Slow

1.0 to 10

kbps

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