VNF1248F datasheet(52/79 Pages) STMICROELECTRONICS

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Bit

Default

Name

Description

If the current state is unlocked and S_T_CFG is not 000, then setting this bit

causes a transition to -test state.

This bit is automatically reset.

S_T_STOP

When it is set to 1, stops execution of the selected-test (when it is applicable).

This bit is automatically reset.

7:5

0x0

S_T_CFG

Test selection:

000: No selection

001: Current sense

010: VDS detection

100: Power switch stuck-on

011: Current sense + VDS detection

101: Current sense + power switch stuck-on

110: VDS detection + power switch stuckon

111: Current sense + VDS detection + power switch stuck-on

Others: Reserved

OUTCTL

Enables high-side through SPI

[1]: HS gate driver commanded on

[0]: HS gate driver commanded off

BYPASSCTL

Enables low current bypass through SPI:

[1]: LCB commanded on

[0]: LCB commanded off

Reserved

WD_TRIG

Mirror of WD_TRIG bit

Parity bit

Odd parity bit check

Table 50. CR#2: control register 2 (read/write); address 02h

Bit

Default

Name

Description

23 ÷ 16 00000000

T_NOM

Configures the value of nominal time required for the fuse emulation: tNOM (s) =

b{T_NOM(7:0), 1}

T_NOMmin = 00000000 → tNOM (s) = b000000001 = 1 s

T_NOMmax = 11111111 → tNOM (s) = b111111111 = 511 s

The nominal time corresponds to the trip time obtained when the current is equal to the

nominal overcurrent threshold (OVC_THR).

15 ÷ 11

00000

OVC _THR

Configures the value of the nominal overcurrent threshold.

The threshold can be set in the range 6 mV to 90 mV

See Table 19. Overcurrent protection.

10 ÷ 7

0000

HSC_THR

Configures a threshold for hard short circuit latch-off.

The threshold can be set in the range from 20 mV to 160 mV.

See Table 18. Hard short circuit protection with integrated 10-bit ADC.

6 ÷ 2

00000

VDS_THRS

Configures a threshold for external MOSFET desaturation shut-down. The threshold can be

set in the range from 0.3 V to 1.80 V in steps of 50 mV (default = 300 mV). Configuration

0x1F is reserved.

WD_TRIG

Mirror of WD_TRIG bit

Parity bit

Odd parity bit check

VNF1248F

SPI functional description

DS14109 - Rev 7

page 52/79

VNF1248F Datasheet(PDF) 52 Page - STMicroelectronics

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