L9965P datasheet(20/104 Pages) STMICROELECTRONICS

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3.4.2

Wake-up from fire enable inputs (FENH/FENL)

In DEEP-SLEEP state the IC is still responsive to FENH/FENL inputs in order to quickly wake-up and be ready to

fire when required.

When either FENH/FENL pin holds the active level for longer than tFENx_FLT, a wake-up condition is

acknowledged and latched in the FENX_WAKEUP bit in the INTERNAL_STATUS register.

If active level of FENH and FENL pins disappears after wake-up trigger, the IC remains in NORMAL state for

tFENx_WAKEUP_WAIT before returning in DEEP-SLEEP state.

These wake-up sources can be enabled setting FENH_EN = 1 and FENL_EN = 1 in NVM.

The active levels can also be programmed through FENH_LEVEL and FENL_LEVEL.

Note:

In order to speed up the wake-up procedure, when the device is awakened by FENH/FENL pin, NVM operations

are locked (neither download nor upload). A transition to DEEP-SLEEP is needed to unlock NVM.

3.4.2.1

FENH/FENL wake-up 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 15. Wake-up sources electrical parameters

Symbol

Parameter

Test condition

Min Typ Max Unit

tFENx_FLT

FENH, FENL input

filter

Analog filter, guaranteed by design

250

800

FENH,

FENL

tFENx_WAKEUP_TIME IC wake-up latency

From the FENH/FENL assertion to the IC

in ARM state (no NVM download)

400

µs

FENH,

FENL

tFENx_WAKEUP_WAIT IC wake-up wait

From the FENH/FENL assertion to the IC

return in DEEP-SLEEP state

1.8

2.1

FENH,

FENL

L9965P

Functional description

DS14702 - Rev 4

page 20/104

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