L9001 datasheet(27/38 Pages) STMICROELECTRONICS

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DS12089 Rev 2

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L9001

Operation modes

8.1

Operation modes condition

The device can operate in different modes, depending on the internal or external triggering

conditions.

8.2

Description of the operation modes

A description of the operation modes is given here and a graphical view is depicted in

Figure 7; additional transitions details are given in and .

8.2.1

OFF mode

OFF mode corresponds to the state when the device is switched off. From OFF mode when

VS is greater than 5.5 V and WAKE is high, L9001 moves to ACTIVE mode.

8.2.2

ACTIVE mode

ACTIVE mode corresponds to the normal activity of the device where all functions are

available. WAKE is High, VS is inside the operative range and no Failure is detected. When

entering ACTIVE mode from OFF or SAFE state, the regulators are powered-up. From this

state L9001 can move to LOW POWER state, FLASH state or SAFE state. A table to clarify

transitions from and to ACTIVE mode is included in .

8.2.3

FLASH mode

FLASH mode corresponds to a state where a super-user is performing activities like SW

development. All functions are available like in ACTIVE mode except the Watchdog, which

is switched off. This mode is entered when WDT>WDT_thi. The device regains Active

mode if WDT<WDT_tho (see Section 7 for details)

Table 15. Operation modes description

Mode

Description

Operating condition

OFF

Off state

All functions switched off

ACTIVE Normal operation

All functions available

FLASH

Super-user mode for SW development or

FLASH mode (external triggered)

All functions available, WD disabled

LOW

POWER

Reduced consumption mode (external

triggered)

VDD1 and VDD2 regulators in bypass

mode, ADCLDO switched off, WD

disabled.

SAFE

Safe state automatically entered in case of

failure (over temperature shutdown, VS

overvoltage, VS undervoltage, and charge

pump undervoltage)

All output voltages are switched off.

Monitoring is still active.

LATCH

Latch state automatically entered in case of

persistent failures (over temperature, charge

pump undervoltage or watchdog)

All output voltages are switched off, all

monitoring is switched off.

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