VNF1048F datasheet(31/49 Pages) STMICROELECTRONICS

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Bit

Default

Name

Description

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

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 shutdown. 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

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 is automatically reset with the next valid SPI frame.

8 ÷ 5

0000

NTC_THR

Configures a threshold for external MOSFET overtemperature shutdown via NTC. The

threshold can be set in the range 37.50 to 110.92.

See Table 17

4 ÷ 3

WD_TIME

Watchdog time selection:

00: tWD = 50ms

01: tWD = 100ms

10: tWD = 150ms

VNF1048F

SPI functional description

DS13084 - Rev 8

page 31/49

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