L99LD02 datasheet(24/66 Pages) STMICROELECTRONICS

24 / 66 page

Functional description

L99LD02

24/66

DS12448 Rev 3

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

(see bit <1> on Table 22: CR#1: Control Register 1)

(EN,GOSTBY) = (0,1)

(see bit <3> and bit <2> on Table 23: CR#2: Control Register 2)

Or upon the condition of TM pin is low for more than a fixed time window (tTM_LOW).

The Pre-standby mode characteristics are:



V3V3 > VPOR



Boost disabled



SPI active

The device leaves automatically Pre-standby mode entering:



Standby, if CSN high for a time t > tSTDBY;



Reset, if CSN Low for a time t > tPRE_STDBY

4.1.3

Reset mode

The device enters Reset mode under the following conditions:



By default, once the device leaves Standby mode;



If in Active mode, when one of the following events occur:

–

VDD 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



Control and status registers set to their default values (according to OTP settings)



SPI inactive

The device leaves automatically Reset mode entering Limp Home after 400 ns (typical).

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