L9658 datasheet(26/64 Pages) STMICROELECTRONICS

26 / 64 page

Functional description

L9658

26/64

Doc ID 14219 Rev 3

4.10.1

Deployment driver diagnostic

L9658 is able to perform a short to battery, a short to ground, a resistance measurement

and a MOS diagnostics on its deployment drivers. A short to ground and an open circuit

conditions are distinguished using a resistance measurement. Here below is shown the

diagram of deployment driver diagnostic.

The diagnostic is performed when a valid SPI command is received. Each current sources

(ISRC and IBIAS) and current sinks (ISINK, IPD_SQH) are turn on or off by a SPI command.

IPD_SQH is turned on when IBIAS is turned on. This pull-down (IPD_SQH) is used to deplete

the charge left on the SQH and SQL capacitors. IPD is permanently connected to SQL. This

current sink pull-down SQL pin during an open circuit condition.

Diagnostic current source or sink and comparator or amplifier are independent. It is possible

to turn on or off the current source or sink on a specific channel, while monitoring the

comparator or amplifier on a different channel. This feature is used to run a short between

loop diagnostic.

Figure 13.

Deployment driver diagnostic diagram

Diagnostic

Logic

AMux

SPI

SCLK

MISO

MOSI

SQLx

Over-current

Detection

SQHx

SRC

v8buck

VRESx

BIAS

AMP

Resistance

Measurement

CMP1

AOUT

Gate Drive

I_TH

SBth

SGth

SINK

GNDx

PD_SQH

AC00211

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