L9969X datasheet(48/70 Pages) STMICROELECTRONICS

48 / 70 page

Bit

CurrLim

1: CL is not active

It is the previously OT error from DIA_REG1

(latched) (r)

VAR3

r/w for special use

(latched) (r/w)

DIA21

See Table 35 below

(r)

DIA20

DIA11

DIA10

Table 35. Diagnosis bits (DIA_REG2)

DIA21

DIA20

DIA11

DIA10

Description

Remark

Not used

Short Circuit to Ground at OUT1 (SCG1)

latched

Short Circuit to Ground on OUT2 (SCG2)

latched

Not used

Short Circuit to Battery on OUT1 (SCB1)

latched

Short Circuit to battery on OUT2 (SCB2)

latched

Short Circuit across load (SCL)

latched

Short Circuit to Battery at disabled output

latched

Short Circuit to Ground at disabled output

latched

Open Load (at disabled output or in active)

latched

Not used

No failure

Any read process of the error information (OL, OT, SCG1, SCG2, SCB1, SCB2, SCL) does not reset this

information or register.

The errors can be reset selectively. By writing STATCON_REG.DIACLR2 = 0, this resets all errors in DIA_REG2,

that is the previous errors. By writing STATCON_REG.DIACLR1 = 0, this transfers all latched errors from

DIA_REG1 to DIA_REG2 and resets DIA_REG1 afterwards, if no undervoltage condition is present.

To fully reset the error logs, the following sequence has to be transmitted via SPI:

•

STATCON_REG.DIACLR1 = 0

•

STATCON_REG.DIACLR2 = 0

OT is the previously error from DIA_REG1.

CurrRed and CurrLim represent the latched information. Each read process of DIA_REG2 resets this error

information. This error information is updated in case the error conditions reappear or are still present.

L9969x

Functional description

DS14029 - Rev 6

page 48/70

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