TLE7259G datasheet(6/23 Pages) INFINEON

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Preliminary Data Sheet

Rev. 1.3, 2004-12-13

TLE 7259 G

Operation Modes

Figure 3

Operation Mode State Diagram

Standby Mode

After a power up, wake-up or low supply condition, the TLE 7259 G is automatically

transferred to the standby mode (see Figure 3). This is realized, by setting EN = low due

to a pull-down. The INH output is automatically switching to high level (=

S), to turn on

the system voltage regulator. In the standby mode, no communication on the bus is

possible. The bus driver is disabled.

In the standby mode, the

µC can detect if a wake-up from sleep mode is caused by the

WK pin or a bus message. This is realized by monitoring the RxD and TxD pin (see

Figure 3).

AEA03514.VSD

Start Up

Power Up

Wake Up

via Bus:

t > t

wak e,bus

via Wake:

t > t

wak e

1) After wake up (via Bus or Wake)

2) After start up

3) After wake up via Wake (internal strong pull down, > 1.9 mA)

4) After wake up via Bus (internal weak pull down, 350 k

Ω)

Normal Mode

High

INH

Sleep Mode

Low

Floating

INH

Stand-By

INH

RxD

TxD

Low

Low 1)

Floating 2)

Low 3)

High4)

High

Low

High

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