SH79F024XU datasheet(44/92 Pages) SINOWEALTH

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SH79F

SH79F082

082

8.1.

8.1.3

3 PWM

PWM

PWM Fault

Fault

Fault Detect

Detect

Detect Function

Function

PWM output can be turned to inactive state if Current Sample detect an Over Current event occurs or FLT input event occurs

if FLTEN is set.

The main purpose of the FAULT function is to disable the PWM output signals and drive them into an inactive state. The

action of the FLT is performed directly by hardware so that when a fault occurs, it can be managed quickly and the PWM

outputs are put into an inactive state to save the power devices connected to the PWM output.

If FLTEN is set, When Fault event is Detected, PWMn will be forced to output GND if PWMnS = 0 or VDD if PWMnS = 1(n = 1,

2, 11, 21).

Table

Table 8

8....3

3 PWM Fault Detect Register

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

FLTCON

FLTEN

FLTSEL

FLTM

FLTSTAT

FLTF

R/W

Reset

Reset Value

Value

((((POR/WDT/LVR

POR/WDT/LVR

POR/WDT/LVR/PIN

/PIN

/PIN))))

Bit

Bit Number

Number

Bit

Bit Mnemonic

Mnemonic

Description

FLTEN

FAU

AULT

LT Detect

Detect

Detect Function

Function

Function control

control

control bit

bit

0: Fault Detect Function disable

1: PWM Fault Detect Function Enable, control by Analog Compare output or

FLT Pin input

FLTSEL

FAULT

FAULT Detect

Detect

Detect Input

Input

Input Source

Source

Source select

select

select control

control

control bit

bit

0: Fault Detect input source from FLT pin (if FLTEN is set and FLTSEL equal

to 0, P0.7 used as FLT Function)

1: Fault Detect input source from Analog Compare output

FLTM

FAULT

FAULT Detect

Detect

Detect Function

Function

Function mode

mode

mode select

select

select bit

bit

0: Latch mode, PWM output will be shutdown once a ‘1’ is detected on Fault

Detect input, and PWM will keep this state even if Fault input became to ‘0’

again, except that FLTSTAT is clear by software. (But if Fault input source is

still ‘1’, FLTSTAT can’t be cleared)

1: Directly mode, PWM output will be controlled by Fault input, If FAULT input

source = 1, Shut-down PWM output, If FAULT input source = 0, Enable

PWM output again

FLTSTAT

FAULT

FAULT Detect

Detect

Detect Status

Status

Status Flag

Flag

Flag bit

bit

0: FAULT Detect status is in inactive state. PWM output normally

1: FAULT Detect status is in active state. PWM output is driving to inactive state

FLTF

Fault

Fault Detect

Detect

Detect Interrupt

Interrupt

Interrupt Flag

Flag

0: no interrupt request

1: FAULT interrupt request occurs

If FLTM = 0, this bit is set on the rising edge of FAULT input source. It will be

cleared by hardware if FAULT interrupt is respond, and also can be cleared by

software if interrupt is disable.

If FLTM = 1, this bit is directly controlled by Fault input. set this bit when input

high; clear this bit when input low

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