L6364 datasheet(29/60 Pages) STMICROELECTRONICS

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Short-circuit detection

In the case of short-circuit or a wake-up request from the Master, the CQ (or DIO) current exceeds the configured

short-circuit threshold. If overload condition lasts longer than tSHORT (delay to filter-out any spurious transients),

the output transistors of the affected output are switched off.

In IO-Link mode, the event is signaled immediately to the microcontroller via the STATUS:SSC bit and an interrupt

is generated.

With CQ in SIO mode or with DIO in independent mode the line is reactivated with the delay tRETRY following the

initial overcurrent event (see Figure 10. Wake-up time diagram). If overload is still present, then it is signaled to

the microcontroller via STATUS:SSC bit and an interrupt is generated. The output stays switched-off for the time

tRESTART in order to allow reception of a valid IO-Link message or to protect the IC against overloading.

If the tRESTART time elapses without intervention by the microcontroller or without reception of a valid IO-Link

message, then the L6364 attempts to drive the line again. In the event of a continued overload, this cycle

repeats indefinitely. The described mechanism ensures detection of an IO-Link Master wake-up request while also

providing full protection of the IC in case of overload.

The short-circuit current thresholds are set by CCTL:SCT[2:0] and DCTL:SCT[2:0]. Where JOIN mode is

requested, the DCTL:SCT[2:0], DCTL:HS and DCTL:LS bits no longer have any effect on the output state or

short-circuit detection.

Table 28. DC short-circuit threshold current, ISET, CQ and DIO

CCTL:SCT, DCTL:SCT

Threshold

DIO/SIO

Threshold

JOIN mode

CCTL:SCT, DCTL:SCT

Threshold

DIO/SIO

Threshold

JOIN mode

decimal

(mA)

decimal

(mA)

110

220

190

380

130

260

210

420

150

300

230

460

170

340

250

500

Figure 10. Wake-up time diagram

L6364

Short-circuit detection

DS13363 - Rev 4

page 29/60

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