L99UDL01 datasheet(23/88 Pages) STMICROELECTRONICS

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DS12511 Rev 5

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L99UDL01

Device description

2.5

Operating modes

We can distinguish among 4 different operating modes: Normal mode, Standby mode,

Sleep mode and Emergency override mode. The L99UDL01 powers up in Standby mode by

default.

Figure 9. State diagram

In Sleep mode no active circuitry is supplied. In standby mode logic is initialized but not

operational. There is no function present in either modes in order to minimize the current

consumption. Only wake-up circuitry is active in Standby mode.

2.5.1

Sleep mode

In sleep mode all circuitry is disabled. There is no charge pump or internal voltages. This is

the lowest quiescent current mode.

Sleep mode is entered when the VDD input falls below VDDSLEEP_F. Prior to entering sleep

mode all control registers are reset to their default values. Sleep mode is exited when VDD

rises above VDDSLEEP_R. Sleep mode only exits into Standby mode.

To avoid anomalous behavior during transition into sleep mode, sleep mode should always

be entered from standby mode. Entering sleep mode directly from any other mode is not

supported.

3V3_UV

3V3<3V3RST

Logic

RESET

Emergency

Mode

Normal

Mode

Standby

Mode

Sleep

Mode

Logic

Initialization

VDD>VDD

SLEEP

VDD<VDDSLEEP

and

VDD<VDDUV

VDD>VDDUV

and CSN

SPI Frame

to STBY

3V3 = 0V

VDD < VDDSLEEP

CSN>VIH

3V3 = 3V3 prereg.

VDD > VDDSLEEP

All Drivers OFF

Charge Pump

VDD > VDDSLEEP

Control Registers are

set to default values

Disabled

3V3 = 3.3V

VDD >VDDUV

3V3 < 3V3UV.

All Drivers OFF

SPI Communications

Charge Pump

Disabled

is still possible

VDD > VDDSLEEP

Charge Pump

Disabled

Control and Status

are set to default values

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