L99LD02 datasheet(22/66 Pages) STMICROELECTRONICS

22 / 66 page

Functional description

L99LD02

22/66

DS12448 Rev 3

Table 7. Operating modes

Operating

mode

Entering conditions

Leaving condition

Characteristics

Standby

mode

– By default, once the device is powered (VS

present);

– CSN High for more than tSTDBY when the

device is in Pre-standby mode

CSN pin Low for t > tWAKEUP

–V3V3 < VPOR;

– VS and VDD low

consumption;

– SPI inactive

Pre-standby

mode

– Under following condition, when device is in

Active mode:



Two consecutive SPI frames setting:

UNLOCK = 1



(EN,GOSTBY) = (0,1)

– Under following condition, when device is in

Limp Home:



Two consecutive SPI frames setting:

UNLOCK = 1



(EN,GOSTBY) = (0,1)

– TM = Low for tTM_LOW

Automatic transition to:

– Standby mode if CSN pin

High for t > tSTDBY

– Reset mode if CSN pin

Low for t > tPRE_STDBY

– V3V3>VPOR

– Boost disabled

– SPI active

Reset mode

– By default, when device leaves Standby

mode

– Under following condition, when device is in

Active mode:



VDD Under voltage



WD failure;



One SPI frame setting

(EN,GOSTBY) = (0,0)



Two consecutive SPI frames setting:

UNLOCK = 1



(EN,GOSTBY) = (1,1)

– Under following condition, when device is in

Pre-standby mode:



CSN pin low for t >tPRE_STDBY

Automatic transition to Limp

Home after 400 ns

– All registers reset to

default values

according to OTP

settings

– V3V3>VPOR

– SPI inactive

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