E981.10 datasheet(14/19 Pages) ELMOS

14 / 19 page

E981.10

14/19

ELMOS Semiconductor AG

Data Sheet

QM-No.: 25DS0007E.02 2010-06-16

Start

- Edge TXEN Low to High

- Edge at TXD and

TXEN=high

and

- no wakeup event

- No recognition of

overcurrent event for20us

(mask overcurrent events)

- disable current limitation

Recognition of Overcurrent

Overcurrent in C /Q driver ?

- Overcurrent in LS or HS

driver

- Bus Level does not fit to

TXD

Enable current limitation

waiting 10 µs

Overcurrent state

- Pin ILIM=High

- C/ Q driver shut off(HighZ)

Waiting in Off - State

- waiting 50µs to 800µs

(depends from voltage level

VDDH)

- Pin ILIM = Low

- C/ Q driver on

Loop

until

Condition1:

-edge at TXD

Condition2:

-Overcurrent in LS or HS

driver

-Bus Level does not fit to

TXD

Enable current limitation

Overcurrent debounce 40 µs

Wakeup state

-Pin ILIM=High

-Pin WAKE = high

-C/Q driver shut off(HighZ)

Loop

until TXEN= LOW

Wakeup- and Ilim-

functionality

Flowchart only valid for TXEN = High

TXEN = Low: Reset of the digital part

Yes

Condtion1:

edge at TXD

Condtion 2 :

overcurrent

event

overcurrent

condition

overcurrent

condition

Figure 5: Overcurrent and wake up functionality

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