TLE8718SA datasheet(39/82 Pages) INFINEON

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TLE 8718 SA

Diagnosis

Data Sheet

Rev. 1.1, 2012-07-31

Figure 11

SCG and OL diagnosis function (not tested, overview only)

8.2

Encoding of Diagnostic Information

All fault conditions are encoded in two bits per stage and are stored in the corresponding registers (DIAREG1...5).

Additionally there is one central diagnostic overtemperature bit (COTW) (this bit is set to ‘0’ if DOT occurred at any

stage).

The common failure bit (DIAREG6, bit FAILURE_FLAG) is set to ‘0’ if SCB, SCG, OL or DOT is detected on any

output stage (OUT1...18). Only if all the stage diagnostic bits are ‘1’, the FAILURE_FLAG bit is ‘1’.

The diagnosis registers can be read via MSC.

When a valid MSC read command (RD_DATA) is detected, the selected diagnosis register information is moved

to a shift register for transmission (MSC upstream). At the same time the selected diagnosis register is cleared.

Table 18

Encoding of diagnosis information

Encoding of the diagnosis bits of the device

OUTn_DIA2

OUTn_DIA1

description

Power stage ok

Short circuit to battery (SBC) or diagnostic overtemperature

(DOT)

Open load (OL)

Short circuit to ground (SCG)

IOUTn

IOUTn_DIA_N(min)

VBAT

VOUTn_BIAS

VOUTn

O.K.

SCG

IOUTn_DIA_P(max)

IOUTn_DIA_N(max)

IOUTn_DIA_P(min)

Output stage is switched off for this measurement

VOUTn_OL

VOUTn_SCG

600µA

220µA

-100µA

-300µA

IOUTn

IOUTn_DIA_N(min)

VBAT

VOUTn

O.K.

SCG

IOUTn_DIA_N(max)

Il_OUTn(max)

Drawing6_SCG_and_OL_Diagnosis _Function.vsd

VOUTn_SCG

20...35µA

-100µA

-300µA

Diagnostic pull-down current and Open Load OL on

Diagnostic pull -down current and Open Load OL off

VOUTn_BIAS

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