L9658 datasheet(27/64 Pages) STMICROELECTRONICS

27 / 64 page

L9658

Functional description

Doc ID 14219 Rev 3

27/64

4.10.2

Continuity diagnostic

A continuity diagnostic includes a short to battery, a short to ground and an open circuit

diagnostics.

During a continuity diagnostic, IBIAS is switched on. On a normal loading condition, SQH

voltage is below SBTH threshold and SQL voltage will be above SGTH threshold.

Figure 14.

Continuity diagnostic flow chart

4.10.3

Short to battery

A short to battery condition will be detected when the voltage on SQH is greater than SBTH

threshold voltage.

4.10.4

Short to ground and open circuit

A short to ground or an open circuit conditions are detected when the voltage on SQL is less

than SGTH threshold voltage. A resistance measurement is utilized to differentiate between

a short to ground or an open circuit conditions.

BEGIN

SQH > SB

during t

FLT_DLY

END

SPI Command:

Connect I

BIAS

SQL < SG

during t

FLT_DLY

Clear SBth and SGth bits

Disconnect I

BIAS

SPI Response:

Send SBth and SGth bits

Set SPI.Diag.SB

Set SPI.Diag.SG

SPI Command:

Disconnect I

BIAS

FLT_DLY= 20μ

Note:

SPI Transmission and SPI

Command can be sent in

the same CS_D.

SPI Transmission

Clear SPI.Diag.SG

Clear SPI.Diag.SB

SQH < SB

during t

FLT_DLY

SQL > SG

during t

FLT_DLY

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