VNF1248F datasheet(53/79 Pages) STMICROELECTRONICS

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Table 51. CR#3: control register 3 (read/write); address 03h

Bit

Default

Name

Description

23:22

0x0

CS_UV_RETRY_T

Current sense undervoltage fault clear auto retry time (only once)

00: 100 μs

01: 250 μs

10: 500 μs

11: 1 ms

21:20

0x0

Reserved

19:18

0x0

CCM_PWM_TON_MF

Capacitive charge mode PWM ton multiplying factor

00: Ton x1

01: Ton x2

10: Ton x4

11: Ton x8

0x0

Reserved

16:14

0x0

CCM_VOUT_THR

Capacitive charge mode VOUT threshold selection

000: 1 V

001: 2 V

010: 3 V

011: 4 V

1xx: 5 V

13:12

0x0

Reserved

11:10

0x0

UV_THR

VS supply undervoltage threshold selection

0x: VS_USD1

10: VS_USD2

11: VS_USD3

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

0x0

NTC_THR

Configures a threshold for external MOSFET overtemperature shutdown.

The threshold can be set in the range [110.92 : 37.50] mV.

4:3

0x0

WD_TIME

00: tWD = 50 ms

01: tWD = 100 ms

10: tWD = 150 ms

11: tWD = 200 ms

Reserved

WD_TRIG

To keep the device in the unlocked state, this bit must be cyclically toggled within a

period equal to tWD to refresh the watchdog.

Parity bit

Odd parity bit check

Table 52. CR#4: control register 4 (read/write); address 04h

Bit

Default

Name

Description

23:2

0x0

NVM_CTM_ACCESS_KEY

A specific word (0x105B96) to be written to have access to NVM programming

control bits

VNF1248F

SPI functional description

DS14109 - Rev 7

page 53/79

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