ZIOL2201 datasheet(90/92 Pages) RENESAS

90 / 92 page

ZIOL2xxx Datasheet

April 26, 2016

Appendix C

ZIOL2xxx Line Fail Detector

The following description of the Line-Fail (LF) Detection feature assumes the utilization of both channels in device

mode. In the case one channel is used only, the number of failures that can be detected with the LF detector will

be reduced accordingly. The following supply failures (Table 10.1) shall be detected or shall not cause undefined

or malfunctions of the device (sensor/actuator). For more information about the Line-Fail detector as part of the

Power-Fail detection feature of the ZIOL2xxx ICs, please refer to chapter 3.5.

Table 10.1 Abnormal Power Supply Situations

Number

Failure

IC Supply

IC function

L+ break

After the break occurred the IC is

supplied by the decoupling caps

which are between VDD and VSS

and LR_OUT and VSS, respectively.

In addition to that the IC might get

“supply power” via incoming (toggling)

cable signals.

As long as the IC has sufficient supply

power (which is normally - at least for

some milliseconds - the case), the LF

function will detect this as LINE_FAULT

event and will rise an exception. This

exception can be signaled to the µC via

the INT_L signal if configured accordingly.

Customer recommendation:

Subsequently the µC shall stop any

communication and shall handle (e.g.

signal) the power fail situation.

L- break

L+ and L-

break

24V power

supply falsely

interconnected

to COM/AUX

in combination

with F1, F2, or

F3.

The IC is permanently powered via

the COM/AUX external protection

diodes (and internal parasitic diodes).

The LF function will detect this as

LINE_FAULT event and will raise an

exception. This exception can be signaled

to the µC via the INT_L signal if

configured accordingly.

Customer recommendation:

Subsequently the µC shall stop any

communication and shall handle (e.g.

signal) the power fail situation (e.g. by

influencing signaling LEDs).

Correct

interconnection

of the 24V

power supply

to L+ and L-

but in addition

to that is the

24V power

supply falsely

interconnected

to COM/AUX.

No difference to the regular power

supply situation.

The LF detector will not act in this

situation.

However, the IC protection is provided by

the overload and over temperature

protection feature.

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