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12-07-0006

PT0211-6

07/06/2012

3

PT8A3230/1/2/3/4/5/6/7

Heating Controller

Block Diagram

Function Description

State description

Reset: The device will be at reset state after power-on.

Heating-on: The device will be at heating-on state after heating-on button is pressed.

Heating-off: This device enters heating-off state after its power-on reset or heating timer timeout or heating-off button pressed.

Timer

Once the device enters Heating-on state, internal timer start counting. It reaches timeout state and exit heating-on state after

216000 clock period, that is, the heating time is about 1 hour for 60Hz CLK signal, and 1.2 hour for 50Hz.

Control signal output

When working in Heating-on state, GATE/LED output will be related to NTC input and CLK input amplitude.

Effect of NTC and CLK input voltage on GATE and LED indication

Working

state

Power line

voltage

NTC

(NTC open

detection)

NTC

(normal temp

detection)

GATE

（Trigger of

SCR）

LED （Pin 5）

PT8A3230/2/4/6

PT8A3231/3/

5/7

ON

240V

NTC<10M(O

hm)

25%

Flash1*

Flash1

On

12.5%

Flash1

Flash1

On

On

0

On

On

On

120V

100%

Flash1

Flash1

On

50%

Flash1

Flash1

On

On

0

On

On

On

OFF

X*

X

0

Off

Off

Off

X

X

NTC>20M(O

hm)

X

0

Flash2*

Off

Off

*Note：1）X means any input.

2）Flash1 frequency if 1/32 CLK.

3）Flash2 frequency is 1/8 CLK.

4）LED2(Pin 7)is always in reverse with LED1.

2bit ADC

Controller

NTC2

NTC1

CLK

GATE

OFF(LED)

ON (ON/OFF)