PT8A3240PE Datasheet PT8A3243PE, PT8A3240PE, PT8A3246PE | P1-P3

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Heating Controller

12-07-0006 PT0217 -5 07/06/12

1

PT8A3240/1/2/3/4/5/6/7

Features

 Dual Voltage (120V/240V) operations

 Auto temperature control with NTC

 NTC open protection

 Multi mode LED indicator

 Direct drive SCR

 Auto Heating off after heating timer timeout

 Low cost 8-Pin DIP and SOIC package

Applications

 Hair Curler

Description

The PT8A3240/1/2/3/14/5/6/7 is a mixed signal

CMOS LSI chip designed for the automatic controller of

heat with external NTC (Negative Temperature

Component). NTC open protection is implemented for

device safety. When NTC is open, it will cut off GATE

output to disable heating, and the LED1 will flash at 1/8

CLK.

The device can be used in both 120V and 240V

power line supplier, automatically adjusting the heating

power according to the power line voltage to avoid

heating appliance damage.

Pin Configuration

NTC1

NTC2

C LK

GND ON

GATE

OFF

VDD1

2

3

4 5

6

7

8

IC01-P10/1/2/3

NTC1

NTC2

C LK

GND ON/OFF

GATE

LED

VDD1

2

3

4 5

6

7

8

IC01-14/5/6/7

Pin Description

No.

Pin Name

I/O

Description

PT8A324

0/1/2/3

PT8A324

4/5/6/7

PT8A324

0/1/2/3

PT8A324

4/5/6/7

1

NTC1

I

NTC voltage input, NTC open detection input.

2

NTC2

O

Output signal for NTC open detection.

3

CLK

I

Clock input from power line.

4

GND

Ground.

5

ON

ON/OFF

I/O

Heating-on button input for PT8A3240/1/2/3 or Heating-

on/off input for PT8A3244/5/6/7 and LED driving output.

6

GATE

O

SCR trigger output, active high.

7

OFF

LED

I/O

O

Heating-off button input and LED2 driving output for

PT8A3240/1/2/3 or only LED2 driving output for

PT8A3244/5/6/7.

8

VDD

Power

Power.

PT8A3244/5/6/7

PT8A3240/1/2/3

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12-07-0006 PT0217 -5 07/06/12

2

PT8A3240/1/2/3/4/5/6/7

Heating Controller

Part No Option

Part No.

LED@ Heating on

Timer of Auto power off

(1h@60Hz)

Control Keys

PT8A3240

Flash

Y

Two Keys

PT8A3241

Constant

Y

Two Keys

PT8A3242

Flash

N

Two Keys

PT8A3243

Constant

N

Two Keys

PT8A3244

Flash

Y

Single Key

PT8A3245

Constant

Y

Single Key

PT8A3246

Flash

N

Single Key

PT8A3247

Constant

N

Single Key

Block Diagram

2bit ADC

Controller

NTC2

NTC1

CLK

GATE

OFF (LED)

ON (ON/OFF)

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12-07-0006 PT0217 -5 07/06/12

3

PT8A3240/1/2/3/4/5/6/7

Heating Controller

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）

PT8A3240/2/4/6

PT8A3241/3/5/7

V

NTC

up

V

NTC

down

ON

220V

NTC<10M(O

hm)

0 ~ V

NTC0

25%

Flash1*

Flash1

On

V

NTC0

~ V

NTC1

12.5%

Flash1

On

V

NTC1

~ V

NTC2

On

V

NTC2

~ V

DD

0

On

110V

0 ~ V

NTC0

100%

Flash1

On

V

NTC0

~ V

NTC1

50%

Flash1

On

V

NTC1

~ V

NTC2

On

V

NTC2

~ V

DD

0

On

OFF

X*

X

0

Off

X

NTC>20M(O

hm)

X

0

Flash2*

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.

PT8A3240PE

PT8A3240PE

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