L99H92 datasheet(45/77 Pages) STMICROELECTRONICS

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5.15

Operating modes

Figure 25. Operating modes

GADG120920221140SA

Active

mode

Standby

mode

Fail-safe

mode

EN low or VDD≤VDDPOR_ON

or VS≤VSPOR_ON

Charge pump OFF

Registers content lost

Gate drivers off

Charge pump ON

Gate drivers forced in sink switch mode

OUTE control bit reset and forced to zero

EN high,

VDD>VDDPOR_OFF,

VS>VSPOR_OFF

FSINB pin high with

FSIN_HS1=FSIN_LS1=

FSIN_HS2=FSIN_LS2 = 0

(FSIN status bit reset to 0),

WDGF status flag set to 0

FSINB pin low (FSIN status bit set to 1

or WDGF status flag set to 1

OUTE = 0,

OLH1L2 = 1 and/or OLH2L1=1

(note)

Off state

diagnostic

mode

OUTE = 1 or

OLH1L2 = OLH2L1=0

Charge pump ON,

Gate driver OFF

Active mode includes

faulty states. Gate

drivers and charge

pump are ON/OFF

according to the

diagnostic table

EN low or VDD≤VDDPOR_ON

or VS≤VSPOR_ON

EN low or VDD≤VDDPOR_ON

or VS≤VSPOR_ON

Note:

To achieve the device minimum current consumption in standby mode, the EN pin has to be pulled low.

Table 41. Diagnostic table

Event

Status

flag/bit

Global

status

byte bit

Device actions

DIAGN pin behavior

VDH overvoltage

VDHOV

Active switch-off of external LS MOSFETs with

maximum available gate current (LS gate drivers

forced in sink switch mode). Active switch-off of

external HS MOSFETs with maximum available

gate current for 32 µs up to 64 µs and as long as

VCP>VDH+3 V, followed by passive/resistive turn

off. Charge-pump switched off

Pulled low if

DGVDHOVE is set

VDH undervoltage

VDHUV

Active switch-off of external LS MOSFETs with

maximum available gate current (LS gate drivers

forced in sink switch mode). Active switch-off of

external HS MOSFETs with maximum available

gate current as long as VCP>VDH+3V, otherwise

passive/resistive turn off.

Pulled low if

DGVDHUVE is set

VS overvoltage Warning

VSOVW

None

Pulled low if

DGVSOVWE is set

VDD overvoltage

VDDOV

Active switch-off of all external MOSFETs with

maximum available gate current (all gate drivers

forced in sink switch mode).

Pulled low if

DGVDDOVE is set

Thermal warning

None

Pulled low if DGTWE is

set

Thermal shutdown

TSD

Active switch-off of external LS MOSFETs with

maximum available gate current (LS gate drivers

forced in sink switch mode). Active switch-off of

external HS MOSFETs with maximum available

gate current for 32 µs up to 64µs and as long as

VCP>VDH+3 V, followed by passive/resistive turn

off. Charge-pump switched off.

Pulled low if DGTSDE

is set

L99H92

Operating modes

DS14069 - Rev 4

page 45/77

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