L99LD21 datasheet(23/73 Pages) STMICROELECTRONICS

23 / 73 page

DS11130 Rev 5

23/73

L99LD21

Functional description

Note:

Vs must be stable above minimum value specified (5.5 V) before rising edge on DIN or

falling edge on CSN.

4.1.2

Pre-standby mode

The device enters Pre-standby mode under the following conditions:

•

upon the two following consecutive SPI frames setting:

–

UNLOCK = 1

–

(EN, GOSTBY) = (0, 1)

The Pre-standby mode characteristics are:

•

V3V3 > VPOR

•

Boost disabled

•

Bucks disabled

•

SPI active

The device leaves automatically Pre-standby mode entering standby:

•

if CSN High and DIN Low for a time t > tSTDBY

4.1.3

Reset mode

The device enters Reset mode under the following conditions:

•

By default, once the device leaves Standby mode;

•

If device state is Active mode, when one of the following events occur:

–VSPI under voltage;

–

Watchdog failure

–

One SPI frame setting (EN,GOSTBY) = (0,0)

–

Two consecutive SPI frames setting

UNLOCK = 1

(EN,GOSTBY) = (1,1)

The Reset mode characteristics are:

•

V3V3 > VPOR

•

All the control and status registers set to their default values

•

SPI inactive

The device leaves automatically Reset mode and enters Limp home after 400 ns (typical).

4.1.4

Limp home

The device enters Limp Home automatically 400 ns after Reset mode.

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