Preliminary Data Sheet

6

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

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

V

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

AEA03514.VSD

Start Up

Power Up

Wake Up

via Bus:

wak e,bus

via Wake:

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)

EN

Normal Mode

High

High

INH

EN

Sleep Mode

Low

Floating

INH

Stand-By

INH

EN

RxD

TxD

Low

High

EN

High

Low

EN

High

EN