VNF1048F datasheet(32/49 Pages) STMICROELECTRONICS

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Bit

Default

Name

Description

11: tWD = 200ms

DIS_OUT_MODE

Outputs status in locked state:

0: leave output and bypass as they are (default)

1: shut off output and bypass

WD_TRIG

In order to keep device in unlocked mode, this bit must be cyclically toggled within a

period equal to tWD to refresh the watchdog.

Parity bit

Odd parity bit check

6.14

Status registers

Table 38. SR#1: status register 1; address 11h

Bit

Default

Name

Description

Access

23 ÷ 19

Unused

DIS_OUT_FAULT

Disable output fault:

a transition to locked mode state causes this bit to be set to 1, but only when

DIS_OUT_MODE = 1.

When DIS_OUT_FAULT = 1, both high-side and bypass are switched off.

R/C

SELFTEST

Self-test state flag bit

OUTST

High-side gate driver status bit

1: HS gate driver turned on

0: HS gate driver turned off

BYPASS_ST

Low current bypass status bit

1: LCB turned on

0: LCB turned off

WAKEUPM

Wake up mode flag bit

LOCKEDM

Locked mode flag bit

HWLO_ST

HWLO mirror bit: provides the logical level of HWLO pin after having applied a

symmetrical filter on both its rising and falling edges (filtering time is tHWLO)

VS_UV

VS undervoltage “real-time” bit

0: VS >VUSD + VS_USD_HYS

1: VS ≤ VS_USD if the battery supply voltage VS falls below the undervoltage

shutdown threshold, then the external MOSFET, the charge pump and the

bypass switch are switched off.

HSHT

Hard short circuit latch-off: a hard short circuit shutdown of the MOSFET

(HSHT = 1) and the bypass switch occurs when the current sense voltage

exceeds the preset threshold.

The MOSFET and the bypass switch are re-armed via SPI.

R/C

VDS_MAX

External MOSFET desaturation shutdown: a desaturation shutdown of the

MOSFET (VDS_MAX = 1) and the bypass switch occurs if the VDS exceeds

the preset threshold when HS is in on-state after VDS_DEGLITCH time.

The MOSFET and the bypass switch are re-armed via SPI.

R/C

BYPASS_SAT

Low current bypass desaturation shutdown: a desaturation shutdown of the

Low current bypass (BYPASS_SAT = 1) occurs if the VDS exceeds the fixed

threshold when HS is in off-state and bypass is in on-state.

When BYPASS_SAT = 1, external MOSFET is automatically commanded on,

independently of OUTCTL bit value.

R/C

VNF1048F

SPI functional description

DS13084 - Rev 8

page 32/49

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