L9960 datasheet(64/95 Pages) STMICROELECTRONICS

64 / 95 page

Functional description

L9960, L9960T

64/95

DS11115 Rev 10

4.8.3

Global Failure Bit NGFAIL definition

NGFAIL groups the following failures:



Over-current on each of the 4 MOS (Ion threshold not taken into account, validity bit not

taken into account), including the load in short-circuit



Open-load in ON-state



Open-load (or shorts) in OFF-state



HWSC (or BIST) not executed or failing



CC_latch_status



VDD Over-voltage (latched)



VDD Under-voltage (latched)



NOTSD_REG



UV_CNT_REACHED = 1 and UV counter stop



NDIS = 0 (also when forced low externally)

Once all the conditions which determine the assertion of NGFAIL are cleared (failure no

more present and the latched version of the failure bit is cleared), the bit is de-asserted.

In case NGFAIL is flagged because of NOTSD_REG assertion, the flag remains set until a

toggle of DIS pin is performed.

There is no failure considered on Vps undervoltage, despite the bridge goes in OFF-state.

There is no clear of NGFAIL by itself, the reported error itself has to be cleared in order to

clear NGFAIL.

Note:

(-) available in the R4 bit position in SPI answer frame 8a.

Table 76. NGFAIL

Bit status

Description

Condition

0failure

no failure

default value

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