ZIOL2201 datasheet(25/91 Pages) ETC2

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ZIOL2xxx – IC Family

IO-Link compliant HV Line Driver IC Family

Data Sheet

January 31, 2012

the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to

changes without notice.

25 of 90

implemented. Since the pin count of the package is limited to 24 pins, the SPI specific pins (CLK, MOSI, and

MISO) are multiplexed with IO-pins of the COM driver. A dedicated pin SPI_EN_L is used to switch between SPI

(logic low) and COM transceiver functionality (logic high). The low voltage (LV) interface works with 3.3V supply

voltage (refer to Figure 3.1). The LV outputs drive 3.3V as high level, the inputs are 5V tolerant.

If the SPI communication channel of the ZIOL2xxx Ics is active (SPI_EN_L = low), the status of the COM channel

drivers is kept. This means while SPI_EN_L = low the output driver status (driving low, driving high, or high-z) is

the same as defined by the pins TX_EN/SPI_CLK and TX/MOSI at the point of time of the SPI_EN_L high-low

transition. The AUX channel is not affected by the activity of the SPI communication. For more information, please

refer to chapter 3.3.8 and Figure 3.10.

3.3.2.

IO-Link Master11 and Device Mode

The IC architecture is suitable for both IO-Link application cases, the physical layer transceiver at an IO-Link

master port and at an IO-Link device port. In the first case the IC shall operate in its “master mode” which is the

case if configuration register [7] bit 7 is set (=1). If the IC shall operate in “device mode”, configuration register [7]

bit 7 shall be cleared (=0). Details regarding the control of both driver channels are described in chapter 3.2.1,

3.2.2.2 and 3.2.3.3.

The IO-Link specific WURQ detection (detection of an IO-Link master’s wake-up request, refer to IO-Link

Communication Specification – chapter 8, [2]) works only in device mode.

3.3.3.

Internal Exceptions

Depending on the IC configuration the ZIOL2xxx can detect several critical situations and rise internal exceptions

accordingly. Also depending on the IC configuration an occurred internal exception can be indicated externally by

changing the logic level of the INT-L pin to “low”. The situations that cause an internal exception are channel locks

(channel driver protection), detected IO-Link specific Wake-Up pulses and several issues concerning the internal

EEPROM as described in chapter 3.3.10.

3.3.4.

IO-Link specific Wake-Up (WURQ)

In device mode the IC can detect the IO-Link specific wake-up request (WURQ) of the IO-Link master and can

therefore help to save resources in the microcontroller of IO-Link device. As regards the IO-Link specific “Wake-

Up (WURQ)” specification, please refer to the IO-Link Communication Specification issued by the IO-Link

consortium (refer to chapter 8, [2]).

The WURQ can be detected on the COM or on the AUX channel. The chosen channel is defined in a

configuration register (IRQ_WURQ_CTRL, refer to chapter 3.3.9).

In order to establish an IO-Link specific communication, the master will generate the WURQ event. In this case

the master overdrives the devices output level for a determined period. The ZIOL2xxx can detect that event which

physically occurs in two ways:

 A current overload in the drivers output for a certain period

 A contradiction of the TX and RX lines of the device for a certain period

11 Not applicable for the IC versions ZIOL22xx/21xx.

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