TLE8082ES datasheet(37/61 Pages) INFINEON

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7.3.1

Diagnosis in OFF-state

All low-side output stages provide open load diagnosis in OFF-state.

All low-side output power stages provide a short to GND diagnosis in OFF-state.

A pull-up current source, a pull-down current source and two detection thresholds are implemented for each

output OFF-state diagnosis.

A short to GND in OFF-state is detected if the output voltage level is below the Diagnosis in off threshold

low for a time longer than the specified filter time (Diagnosis in off filter time OUT1 and OUT2, Diagnosis in

off filter time OUT3 and OUT4).

An open load in OFF-state is detected if the output voltage level is between the Diagnosis in off threshold

low and the Diagnosis in off threshold high for a time longer than specified filter time (Diagnosis in off filter

time OUT1 and OUT2, Diagnosis in off filter time OUT3 and OUT4).

In case of an OFF-state diagnosis detection condition, the respective diagnosis bit in register Diag1 is set. The

diagnosis bits are reset after a readout of register Diag1 if no fault condition is present.

VOUTx

Vth,off,high

Vth,off,low

OFF

tfilx,off

OXDIA

No failure

Short to

GND

Open load

Short to GND

(if Diag was

read)

Open load

No failure

(if Diag1 was read)

tfilx,off

Figure 9

Short circuit to GND and open load diagnostic function timings (overview only)

The pull current sources are implemented to define the output voltage level in case of an open load in between

the two thresholds.

IOUTn

Ipu,off min

VBAT

VOUTn

Normal operation

Open load

Short to

GND

Vth,off,high

Vth,off,low

Ipu,off max

Ipd,off max

Idpd,off min

Figure 10

Diagnosis current behavior over output voltage

TLE8082ES

Small engine management IC

Power stages

Datasheet

Rev. 1.0

2021-03-23

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