L9965P datasheet(19/104 Pages) STMICROELECTRONICS

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3.4

Wake-up sources

The following section lists the available wake-up sources and their behavior.

Whenever a wake-up source is validated, the wake-up sequence is initiated and shall successfully end within

tWAKEUP_TIMEOUT. Otherwise, the IC returns to the previously held low power state.

Table 13. Wake-up sources electrical parameters

Symbol

Parameter

Test condition Min Typ Max Unit

tWAKEUP_TIMEOUT

Timeout for completing the wake-up

sequence

Tested by SCAN 20

CWUP, FENH, FENL,

SPI

3.4.1

Wake-up from cyclic wake-up pin (CWUP)

The CWUP pin can be used by the host controller for the following purposes:

•

Triggering cyclic wakeups and diagnostics in low-power strategies.

•

Keep the device constantly in NORMAL state in full-power strategies.

When the CWUP pin is set high for longer than tCWUP_POWERUP_PULSE (tCWUP_FLT filter time is applied), a wake-

up condition is acknowledged and latched in the CWUP_WAKEUP bit in INTERNAL_STATUS register. The IC

completes the power-up phase after tCWUP_POWERUP_TIME since the CWUP signal is set high.

This wake-up source is always available.

3.4.1.1

CWUP electrical parameters

All parameters are tested and guaranteed in the following conditions, unless otherwise noted: all supplies

according to the Table 3; TJ according to the Table 2.

Table 14. CWUP electrical parameters

Symbol

Parameter

Test condition

Min Typ Max Unit

tCWUP_FLT

CWUP filter time

Input filter time, guaranteed by design

250

800

CWUP

tCWUP_POWERUP_PULSE

CWUP min input pulse

to start power-up

Minimum time to guarantee a correct

power-up (starting from the CWUP low to

high transition)

100

µs

CWUP

tCWUP_POWERUP_TIME IC wake-up latency

From the CWUP low to high transition to

the IC in DIAG (full download of NVM)

ms CWUP

L9965P

Functional description

DS14702 - Rev 4

page 19/104

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