ZIOL2201 datasheet(18/92 Pages) RENESAS

18 / 92 page

ZIOL2xxx Datasheet

April 26, 2016

3.2.2.

Transmitter

3.2.2.1.

General functionality

The IC versions ZIOL24xx consists of two

1 independent driver stages. Each driver (COM/AUX) is configurable as

regards the parameter

• Output current limitation

• Output slew rate

• Driver function (push, pull, pull ups/downs)

Several Modes of operation are supported – as independent or as combined driver outputs.

3.2.2.2.

Modes of operation (IO-Link specific Operation)

Operating both on-chip drivers independently or in parallel ensures the IC utilization in a wide range of

applications. An example can be the different requirements of driver capability in master or device mode regarding

the IO-Link specification (refer also to chapter 3.3.2). Both modes are supported by the ZIOL2xxx Ics. The active

mode is defined in the configuration register [7] bit 7. The chosen mode influences the IC’s driver behavior as well

as the handling of overload exceptions. Both input channels do not depend on the operational mode.

In master mode

2 the data inputs (TX) of both drivers are connected internally. As regards their functionality both

drivers work in parallel. Therefore, the driver outputs have to be interconnected externally in master mode.

In device mode both drivers are working independently. A respective current overload signal will be generated if

at one or at both drivers the output current exceeds the set current limit for longer than the configured amount of

time.

Figure 3.5 shows a simplified application circuit including ZIOL24xx Ics in device and in master mode,

respectively. Although both drivers are controlled by the same “TX” signal in master mode, the driver strength can

be influenced with the COM_EN and AUX_EN signal thus the resulting driver strength can be reduced in this

mode.

Starting with Rev B of the IC the MASTER_MODE flag (configuration register MASTER_SENS_CTRL[7] replaces

the formerly used control via an input pin. Summarizing the above, the MASTER_MODE flag controls:

• The Data path; it controls whether both channels use an individual or common TX signal

• The current sinks at the receiver’s inputs in the IO-Link sink mode (refer to Table 3.4)

For more information about the data path configuration of the IC in device and in mode master, please refer to

chapter 3.2.1.

1 Note: The IC versions ZIOL22xx/21xx have just one channel. With respect to those IC versions the statements concerning the existence of

two channels shall be ignored or interpreted analogously.

2 Not applicable for the IC versions ZIOL22xx/21xx

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