VNF1048F datasheet(30/49 Pages) STMICROELECTRONICS

30 / 49 page

Address

Name

Description

Access

Content

14h

WD bit pos. 2

Bit7,WB1 = 1

Bit6,WB0 = 1

Bit position of the WD bit within the corresponding configuration register

= 01d = 000001b

Read only

C1h

3Fh

Advanced

Operation Code

Access to this address provokes a SW reset (all control registers are set

to their default values; in addition, all clearable status registers are

cleared too).

Note:

data field should not be “all ones”, otherwise an “SDI

stuck at” error occurs.

Read only

00h

6.13

Control registers

Table 35. CR#1: control register 1 (read/write); address 01h

Bit

Default

Name

Description

23 ÷ 12

Unused

GOSTBY

GOSTBY can be set to 1 only if UNLOCK = 1; trying to set this bit to 1 when UNLOCK = 0

will have no effects and it maintains its previous value.

GOSTBY can be reset to 0 also when UNLOCK = 0.

To send a GOToStandby sequence it is necessary to send two consecutive SPI frames, as

follows:

1st SPI writes operation to set UNLOCK bit to 1

2nd SPI write operation to set GOSTBY bit to 1 and EN bit to 0.

A transition to standby state causes GOSTBY to be reset to 0.

EN can be set to 1 only if UNLOCK = 1; trying to set this bit to 1 when UNLOCK = 0 will have

no effects and it maintains its previous value.

EN can be reset to 0 also when UNLOCK = 0.

To send a GOToUnlocked sequence it is necessary to send two consecutive SPI frames as

follows:

1st SPI writes operation to set UNLOCK bit to 1

2nd SPI write operation to set GOSTBY bit to 0 and EN bit to 1.

A transition to unlocked state causes EN to be set to 1.

A transition to locked state causes EN to be reset to 0.

S_T_START

When it is set to 1, starts selected self-test.

If current state is unlocked and S_T_CFG is not 000, then setting this bit causes a transition

to self-test state.

This bit is automatically reset.

S_T_STOP

When it is set to 1, stops execution of selected self-test.

This bit is automatically reset.

7 ÷ 5

000

S_T_CFG

Self-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 stuck-on

VNF1048F

SPI functional description

DS13084 - Rev 8

page 30/49

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