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PT8A3240/1/2/3/4/5/6/7
Heating Controller
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
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.
Applications
Hair Curler
Pin Configuration
N TC1
N TC2
C LK
G ND
IC01-P10/1/2/3
1
2
3
4
8
7
6
5
V DD
O FF
G ATE
ON
N TC1
N TC2
C LK
G ND
IC01-14/5/6/7
1
2
3
4
8
7
6
5
V DD
LED
G ATE
O N/O FF
PT8A3240/1/2/3
PT8A3244/5/6/7
Pin Description
Pin Name
No.
PT8A324
0/1/2/3
NTC1
NTC2
CLK
GND
ON
GATE
OFF
VDD
PT8A324
4/5/6/7
NTC1
NTC2
CLK
GND
ON/OFF
GATE
LED
VDD
PT8A324
0/1/2/3
I
O
I
GND
I/O
O
I/O
Power
I/O
PT8A324
4/5/6/7
I
O
I
GND
I/O
O
O
Power
Description
1
2
3
4
5
6
7
8
NTC voltage input, NTC open detection input.
Output signal for NTC open detection.
Clock input from power line.
Ground.
Heating-on button input for PT8A3240/1/2/3 or Heating-
on/off input for PT8A3244/5/6/7 and LED driving output.
SCR trigger output, active high.
Heating-off button input and LED2 driving output for
PT8A3240/1/2/3 or only LED2 driving output for
PT8A3244/5/6/7.
Power.
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Heating Controller
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Part No Option
Part No.
PT8A3240
PT8A3241
PT8A3242
PT8A3243
PT8A3244
PT8A3245
PT8A3246
PT8A3247
LED@ Heating on
Flash
Constant
Flash
Constant
Flash
Constant
Flash
Constant
Timer of Auto power off
(1h@60Hz)
Y
Y
N
N
Y
Y
N
N
Control Keys
Two Keys
Two Keys
Two Keys
Two Keys
Single Key
Single Key
Single Key
Single Key
Block Diagram
NTC1
2bit ADC
OFF (LED)
Controller
NTC2
GATE
CLK
ON (ON/OFF)
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Heating Controller
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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)
0 ~ V
NTC0
V
NTC0
~ V
NTC1
V
NTC1
~ V
NTC2
V
NTC2
~ V
DD
0 ~ V
NTC0
V
NTC0
~ V
NTC1
V
NTC1
~ V
NTC2
V
NTC2
~ V
DD
X
GATE
（Trigger
of
SCR）
25%
12.5%
0
100%
50%
0
0
0
LED
（Pin
5）
PT8A3240/2/4/6
PT8A3241/3/5/7
V
NTC
V
NTC
up
down
On
Flash1*
Flash1
Flash1
On
Flash1
Flash1
On
Off
Flash2*
Flash1
On
On
Flash1
Flash1
On
On
Off
Off
On
On
On
On
On
Off
Off
220V
ON
110V
NTC<10M(O
hm)
OFF
X
X*
X
NTC>20M(O
X
hm)
*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.
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Heating Controller
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Maximum Ratings
Storage Temperature…………………………………………..- 65
o
C to +150
o
C
Ambient Temperature with Power Applied……………………-20
o
C to +85
o
C
Supply Voltage to Ground Potential (Inputs & V
CC
only)……….- 0.5 to +6.0V
Supply Voltage to Ground Potential (Outputs & D/O only) …… - 0.5 to +6.0V
DC Input Voltage …………………………………………- 0.5V to V
CC
+0.5V
DC Output Current ……………………………………………………… 20mA
Power Dissipation……………………………………………………… 500mW
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Recommended Operation Conditions
Sym
V
CC
f
CLK
T
A
CLK
-
Pin
VDD
Description
Supply voltage.
Input clock frequency
Operation temperature
Min
3.5
-
-20
Typ
5.0
50/60
-
Max
5.5
-
85
Unit
V
Hz
C
DC Electrical Characteristics
(Unless otherwise noted, V
CC
= 3.5 ~ 5V, T
A
= -20 ~ 85º
C)
Sym
I
IH
Description
Input high current
PIN: NTC2
PIN: NTC1, CLK
I
IL
I
OH
I
OL
V
NTC0
V
NTC1
V
NTC2
I
CC
Input low current
PIN: NTC2
Output high current
Output low current
PIN: GATE
Input voltage 0
Input voltage 1
Input voltage 2
Current consumption
PIN: GATE
PIN: NTC2
Test conditions
PIN: NTC1, CLK
V
IN
= V
CC
V
IN
= V
CC
Output
high impedance
V
IN
= GND
V
IN
= 0 Output
high impedance
V
CC
= 5.0V
Vout = 4.5V
V
CC
= 5.0V
Vout =0.5V
PIN: NTC1
PIN: NTC1
PIN: NTC1
NTC1, CLK tied to GND, V
CC
= 5.0V
Min
-
-
-
-
-1.5
2.0
2.5
0.37V
CC
0.37V
CC
0.39V
CC
-
Typ
-
-
-
-
-
-
-
0.385V
CC
0.385V
CC
0.40V
CC
-
Max
5
5
-5
-5
-
-
-
0.40V
CC
0.40V
CC
0.41V
CC
250
A
V
Unit
A
A
A
A
mA
mA
mA
AC Electrical Characteristics
(Unless otherwise noted, V
CC
= 3.5 ~ 5V, T
A
= -20 ~ 85º
C)
Sym
Description
Test conditions
f
CLK
Timer
CLK frequency
Power off timer
-
F
CLK
= 50Hz
Min
-
1.15
Typ
50/60
1.2
Max
-
1.25
Unit
Hz
Hour
12-07-0006
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PT0217 -5
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PT8A3240/1/2/3/4/5/6/7
Heating Controller
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Typical Application Circuit
PT8A3240/1/2/3 application circuit
PT8A3244/5/6/7application circuit
12-07-0006
5
PT0217 -5
07/06/12
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