L6364 datasheet(23/60 Pages) STMICROELECTRONICS

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Table 19. Transparent mode operation

CCTL:SIO

CCTL:HS

CCTL:LS

Operation

Short-circuit

SIOListen operation

Short reported after retry

Low-side SIO operation

High-side SIO operation

Push-pull SIO operation

IOListen operation

Short timers reset

Do not use

Push-pull IO-Link operation

Short reported immediately

In transparent SIO operation (CCTL:TRNS='1', CCTL:SIO='1') a short is only reported after N retries, see tRETRY,

which is suitable to indicate the presence of a valid IO-Link wake-up pulse.

In transparent IO-Link operation (CCTL:TRNS='1', CCTL:SIO='0'), a short is reported immediately after tSHORT.

In both cases the device attempts to drive the line again after tRETRY and then tRESTART without intervention from

the microcontroller.

The output switches are disabled while a short is reported, protecting the device from excessive dissipation.

The short condition and associated internal timers can be reset by setting IOListen operation (CCTL:TRNS='1',

CCTL:SIO=CCTL:HS=CCTL:LS='0'), which allows switching to push-pull IO-Link operation after valid data has

been received.

Following a cleared short condition, a new driving operation should only be selected after receiving valid IO-Link

data or waiting for at least tRESTART.

8.4.1

Transparent mode input path

With SS='1' in transparent mode, the level of the MISO line is the inverted level of the CQ signal. The signal is

filtered with a constant delay filter, (1/16) * TBIT, see Table 5, to remove line glitches.

8.4.2

Leaving transparent mode

Transparent mode is left by clearing the CCTL:TRNS register bit to '0' via the SPI.

L6364

Transparent mode output path

DS13363 - Rev 4

page 23/60

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