VNF1048F datasheet(34/52 Pages) STMICROELECTRONICS

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Bit

Default

Name

Description

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 stuck-on

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

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

Unused

WD_TRIG

Mirror of WD_TRIG bit

Parity Bit

Odd Parity Bit Check

Table 36. CR#2: Control Register 2 (read/write); Address 02h (ID 13.20)

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 = 1s

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

Nominal Time corresponds to the trip time obtained when current is equal to the Nominal

Overcurrent Threshold (OVC_THR).

15 ÷ 11

00000

OVC _THR

Configures the value of Nominal Overcurrent Threshold.

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

See Table 16

10 ÷ 7

0000

HSHT_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 15

6 ÷ 2

00000

VDS_THR

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

Table 37. CR#3: Control Register 3 (read/write); Address 03h (ID 13.3)

Bit

Default

Name

Description

23 ÷ 10

unused

UNLOCK

0: bits GOSTBY, EN cannot be set to 1 but can be reset;

1: bits GOSTBY, EN can be set to 1, but only with the next valid SPI frame.

When UNLOCK = 1, it will be automatically reset with the next valid SPI frame.

VNF1048F

Control registers

DS13084 - Rev 6

page 34/52

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