ZIOL2201 datasheet(24/92 Pages) RENESAS

24 / 92 page

ZIOL2xxx Datasheet

April 26, 2016

independently. If at least one of both events appears for a specific time, the incident will be regarded as WURQ

request from master side and the IC will generate an internal exception (issue an interrupt) in order to signal this

to the interconnected µC. Besides the configurable signaling on the INT_L pin (refer to chapter 3.3.10.1) this

special exception will be displayed on the therefore dedicated WURQ_L pin. Details of the signaling via the

WURQ_L and/or the INT_L pin and the pin driver configuration of the WURQ_L pin can be defined in the

configuration registers which are described in detail in chapter 3.3.9.

The logic level of the WURQ_L pin (a wake-up causes logic low) or the stored WURQ event will be reset as soon

as the drivers direction is set to input (TX_EN=0), which equals the WURQ acknowledge from the IO-Link device

side.

The on logic level based WURQ detection works only for level-changes which are driven by the master. That

means a WURQ will not be detected if a level change has been initiated by the device itself, even if the signal

timing is equivalent to a WURQ event. This prevents the in SIO mode operating IO-Link device to misinterpret the

situation caused for instance by capacitive loads.

If the ZIOL2xxx operates in master mode (physical interface for IO-Link master port) and a Wake-Up pulse

(WURQ) shall be issued, the µC has to control the required driver strength by activating both channels (via

COM_EN and AUX_EN, refer to Figure 3.5) and has to provide the correct timing.

Figure 3.7

Wake-Up Signal Recognition

twurqL

µs

-10%

+10%

110

Accepted Wake-Up pulse width range if

OSC runs at lowest possible frequency

Accepted pulse width range if

OSC runs at highest possible frequency

Overdriven Output

Overdriven

Output

twurqU

Pulse

Width

Accepted Wake-Up

pulse width range (device)

-10%

+10%

Tolerance range due

tolerant OSC frequency

- 6 / + 25 clocks

MIN: Wake-Up pulse width

MAX: Wake-Up pulse width

The WURQ pulse recognition of the ZIOL2xxx in device mode is – in contrast to that – based on a time base

derived from the internal oscillator (OSC). Therefore the as WURQ recognized pulse width range of an received

Wake-Up signal is dependent on the frequency tolerance of the internal oscillator as illustrated in Figure 3.7. A

Wake-Up signal (pulse width according to the IO-Link Communication Specification, refer to chapter 8, [2]) shall

have a pulse width between 75µs and 85µs (variation 10µs). The ZIOL2xxx Wake-Up signal detection will always

recognize such a signal securely considering a frequency tolerance of the internal oscillator of ±10% (refer to

parameter fosc in Table 2.3).

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