L9965P datasheet(23/104 Pages) STMICROELECTRONICS

23 / 104 page

•

Manually

–

Setting FAULTN_FORCE = 1 forces the FAULTN output low, instead setting FAULTN_FORCE = 0

releases the output. The FAULTN_FORCE command overrides any other FAULTN output buffer

driving signal.

–

This strategy is recommended when multiple L9965P are present in the system and their FAULTN

outputs are connected in wired-OR.

•

Once per cycle in low power mode (refer to the Figure 8 and Figure 9)

–

At each CWUP rising edge, the L9965P starts its cyclic wake-up.

–

Once awake, the L9965P generates a negative pulse lasting tFAULTN_PULSE on the FAULTN output

line.

–

This diagnostic does not require the use of the FAULTN_CYCLIC_PULSE bit since the FAULTN pin

is automatically checked at each wake-up cycle.

Figure 6. FAULTN integrity check in full power mode

CWUP

FLTIN_L9965C

FAULTN_L9965P

tFLTIN_TIMEOUT

FAULT EVENT

FAULT

CLEARED

tCWUP_WAKEUP_TIME

tFAULTN_PULSE

TIMEOUT

Internal timeout

of L9965C

Internal deglitch

of L9965C

FAULT

LATCHED

tFLTIN_DEGLITCH

tFAULTN_PERIOD

Figure 7. FAULTN cyclic pulse generation start

CWUP

FLTIN_L9965C

FAULTN_L9965P

tCWUP_WAKEUP_TIME

tFAULTN_PULSE

FAULTN_CYCLIC_PULSE 0 1

tFAULTN_PERIOD

Figure 8. FAULTN integrity check in low power mode (example of timeout detected by L9965C)

CWUP

tFLTIN_TIMEOUT

tCWUP_WAKEUP_TIME

tFAULTN_PULSE

TIMEOUT

Internal timeout

of L9965C

Internal deglitch

of L9965C

tCWUP_PERIOD_xxx

(L9965C)

MCU intervenes switching

to full power for fault

acknowledgement routine

FAULT

CLEARED

FLTIN_L9965C

FAULTN_L9965P

L9965P

Functional description

DS14702 - Rev 4

page 23/104

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