VNF1248F datasheet(55/79 Pages) STMICROELECTRONICS

55 / 79 page

12.14

Status registers

Table 54. SR#1: status register 1; address 11h

Bit

Default

Name

Description

Access

23:22

0x0

CCM_STATUS

Capacitive load charge burst mode operation status:

00 → IDLE: CCM operation not started

01 → RUN: CCM operation started running

10 → CHARGED: CCM operation completed successfully

11 → CHARGE INCOMPLETE: CCM operation aborted (timeout/short circuit)

R/C

CS_UV

Current sense (ISense_P) undervoltage bit

Set if Isense_P voltage falls below the internally configured current sense

undervoltage threshold.

It is reset:

1. in Fail-safe state if FS_MODE = `00'/`01' AND DIN falling edge occur.

2. in Unlocked/Locked state if DIN_CTRL_EN = 1 AND DIN falling edge

occur.

R/C

EXT_REG_ON

The EXT_REG_ON bit is "0" by default; it is latched to `1' if the VEXT_LDO >

VEXT_LDO_H, (the device is automatically powered by the external regulator)

and reset when a power-on or a standby state occurs (internal supply node

DIN_ST

DIN input status flag bit

DIS_OUT_FAULT

Disable output fault:

this bit is set during a transition to fail-safe state when CR#1_FS_MODE =

“11”. When it is set, both the high-side and bypass are switched off.

R/C

SELFTEST_STATE FSM SELF-TEST state flag bit

OUT_ST

High-side gate driver status bit

[1]: HS gate driver turned on

[0]: HS gate driver turned off

BYPASS_ST

Low current bypass status bit

[1]: LCB turned on

[0]: LCB turned off

LOCKED_STATE

FSM LOCKED state flag bit

FAILSAFE_STATE FSM fail-safe state flag bit

HWLO_ST

HWLO mirror bit

VS_UV

VS undervoltage “real-time” bit

[0] VS > VS,UV_H

[1] VS ≤ VS,UV_L

If the battery supply voltage VS falls below the undervoltage shutdown

threshold, then the HS gate driver, bypass, and charge pump are switched off.

HSC

Hard short circuit latch-off: a hard short circuit shut-down of the MOSFET

(HSC = 1) occurs when the current sense voltage exceeds the preset

threshold. When it happens, the bypass is switched off as well. The MOSFET

is re via SPI.

R/C

VDS_MAX

External MOSFET desaturation shut-down: a desaturation shut down of the

MOSFET (VDS_MAX = 1) occurs if the VDS exceeds the preset threshold when

HS is in on-state after a preset blanking time. When it happens, the bypass is

switched off as well.

The MOSFET is rearmed via SPI.

R/C

VNF1248F

SPI functional description

DS14109 - Rev 7

page 55/79

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