VNF1048FTR datasheet(41/52 Pages) STMICROELECTRONICS

41 / 52 page

•

VSPI and VS low consumption

•

SPI inactive

•

Registers are frozen (powered but with clock stopped) allowing to keep either previous configuration, in case

of transition from Unlocked state, or default reset configuration, in case of transition from power-on state.

The Standby mode is reached in case of power-on state transition from Unlocked mode through the following SPI

frame sequence:

Frame #1 to set UNLOCK bit in CR#3

Frame #2 to reset EN and set GOSTBY in CR#1

Exit from Standby mode occurs in any of the following cases:

CSN Low for a time t > tSTBY_OUT or BYPASS switch in ON state and de-saturation event occurrence.

7.4

WakeUp mode

The device enters in WakeUp mode from Stand-by when the VS – VOUT > VDS_BYPASS_SAT

In WakeUp mode, the device fuse functionality is armed and the device operates under the following conditions:

•

High current path through external FETs is ON

•

Protections for the external FETs are enabled

•

Low-Current Bypass is OFF

•

All diagnostics are enabled

•

Control registers are locked to write operations

•

Device is self-protected

•

SPI is active

•

Charge Pump is ON

7.5

Unlocked mode

In Unlocked mode, the device fuse functionality is armed and SPI communication is allowed. The device operates

under the following conditions:

•

High current path through external FETs can be ON or OFF, depending on the SPI setting

•

Protections for the external FETs are enabled

•

All diagnostics are enabled

•

Low-Current Bypass can be ON or OFF, depending on the SPI setting

•

Device is self-protected

•

SPI is active

•

Charge Pump is ON

7.6

Locked mode

In locked mode, the device fuse functionality is armed. The device operates under the following conditions:

•

External FETs status is defined by 'OUTCTL' and 'DIS_OUT_MODE' control bits

•

Protections for the external FETs are enabled

•

All diagnostics are enabled

•

Low-Current Bypass is defined by 'BYPASSCTL' and 'DIS_OUT_MODE' control bits

•

Device is self-protected

•

SPI is active, all registers can be read, Control registers are locked to write operations

•

Charge Pump is ON

7.7

Self-test mode

See Section 4 Self Test in this document.

VNF1048F

WakeUp mode

DS13084 - Rev 6

page 41/52

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