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PT8A3252/54
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5LED Ceramic Heating Controller
Features
Description
The PT8A3252/54 is specially designed for ceramic
heating control with 5 internal level of 130C, 145C,
160C, 175C, 190C. And the temperature range can be
adjusted from 100C to 250C by external series
resistance. It can drive SCR directly and detect heater
temperature by heater-self without extra temperature
sensor. It has 3 keys for function setting, 5 LEDs for
working status indication. The PT8A3252 has an
internal timer; it timeouts and device will stop heating
automatically after 216000 clock period, ie. 1 hour for
60Hz and 1.2 hour for 50Hz. The circuit of Over-Heat
Protection will be working for safety when heater
Pulse trigger with high current for SCR
Quickly Heating-Up and Quickly Lost-Heat-
Recover
External Adjustable to fit wide range heating plates
External Adjustable to different TCR of sensors
Full temperature compensation and insensitive to
environment temperature
5 Heat Temperature Settings
Auto power off (only for PT8A3252)
Over Temperature protection
DIP-16 and SOIC-16 packages
Applications
temperature reached to 250C. The chip is packaged in
lead free DIP-16 and SOIC-16.
Ceramic Heating Controller
High watt density Alumina Heaters
Pin Configuration
L4
C1
C2
REF2
REF1
PTC
GATE
OT
1
2
3
4
5
6
7
8
16
15
14
L3
L2
L1
PT8A3252/54
13 VDD1
12 VDD2
11 VB
10 GND
9 CLK
12-07-0006
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07/06/12
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PT8A3252/54
5LED Ceramic Heating Controller
Pin Description
Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
L4
C1
C2
REF2
REF1
PTC
GATE
OT
CLK
GND
VB
VDD2
VDD1
L1
L2
L3
I/O
I/O
O
O
O
I
I
O
O
I
GND
O
Power
Power
I/O
I/O
I/O
Adjust input and LED output.
LED scan common driver.
LED scan common driver.
Reference 2 for internal comparator.
Reference 1 for internal comparator.
Temperature sensor input.
SCR trigger output, active high.
Over heat output.
Clock input from power line.
Ground.
PTC sampling power source.
Power.
Power.
On/Off key input and LED output.
Down key input and LED output.
Up key input and LED output.
Block Diagram
C1
C2
VB
L1
PT C
Comp
L2
Logic
Control
L3
L4
REF1
Ref Select
REF2
GAT E
CLK
Comp
OT
OSC
12-07-0006
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07/06/12
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PT8A3252/54
5LED Ceramic Heating Controller
Maximum Ratings
Storage Temperature ................................................................................... -55oC to +150oC
Ambient Temperature with Power applied...............................................-20oC to +85oC
Supply Voltage to Ground Potential (Input & V
DD
Only).........................-0.5V to+6.5V
Supply Voltage to Ground Potential (Output s Only) ................................-0.5V to+6.5V
DC Input Voltage .............................................................................................-0.5V to +6.5V
Input/Output Current ................................................................... 50mA
Input/Output Current (Pin VDD2, VB only) ............................. 200mA
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
VDD
T
A
Parameter
Operating Voltage
Operating temperature
Pin
VDD1, VDD2
-
Min
4.0
-20
Typ
5.0
-
Max
6.0
85
Unit
V
°
C
DC Input Electrical Characteristics
Symbol
Description
Test Conditions
PIN: PTC, CLK
I
IH
Input high current
PIN: L1, L2, L3,
L4
PIN: PTC, CLK
PIN: L4
I
IL
Input low current
PIN: L1, L2, L3
V
IN
= V
DD
V
IN
= V
DD
(L1, L2, L3, L4 is of
input)
V
IN
= GND
V
IN
= GND
(L4 is of input)
V
DD
=5.0V
V
IN
= 2.0V
(L1, L2, L3 is of
input)
-
-
L4
Min
-
-
-
-
Type
-
-
-
-
Max
5
5
-5
-5
A
A
Unit
-0.06
-
-0.20
mA
V
IH
V
IL
V
IT
Input High Voltage
Input Low Voltage
Input Threshold Voltage
PIN: L1, L2, L3
PIN: L1, L2, L3
VT1_Level
VT2_Level
0.8 V
DD
-
2.8
1.1
-
-
3.3
1.6
-
0.4 V
DD
3.8
2.1
V
V
V
V
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PT8A3252/54
5LED Ceramic Heating Controller
DC Output Electrical Characteristics
Symbo
l
Description
Test Conditions
PIN: GATE
PIN: OT
I
OH
Output High Current
PIN: L1, L2, L3
PIN:C1
PIN:L4
PIN: GATE
PIN: OT
I
OL
Output Low Current
PIN: C1, C2
PIN: L4
V
DD
= 5.0V
Vout = 2.5V
V
DD
= 5.0V
Vout = 4.5V
V
DD
= 5.0V
Vout = 4.5V
V
DD
= 5.0V
Vout = 4.5V
V
DD
= 5.0V
Vout = 4.5V
V
DD
= 5.0V
Vout =0.5V
V
DD
= 5.0V
Vout =0.5V
V
DD
= 5.0V
Vout =0.5V
V
DD
= 5.0V
Vout =0.5V
Min
-15
-3.0
-3.0
-3.0
-3.0
4.0
4.0
4.0
4.0
Type
-
-
-1
-
-
-
-
-
-
Max
-
-
-1.2
-
-
-
-
Unit
mA
mA
-
-
Power Supply Characteristics
Symbo
l
V
POR
I
DD
Description
Voltage of POR
Current consumption
Test Conditions
-
No loading, V
DD
= 5.0V
Control function normal
F
CLK
= 50Hz
Min
1.5
-
4.0
1.15
Type
-
-
-
1.2
Max
2.5
400
6.0
1.25
Unit
V
A
V
Hour
V
DD
TPO
off
Supply voltage
Power off timer
Temperature Control Characteristics
Symbol
VT
130
VT
145
VT
160
VT
175
VT
190
Description
Threshold Voltage Level (130C)
Threshold Voltage Level (145C)
Threshold Voltage Level (160C)
Threshold Voltage Level (175C)
Threshold Voltage Level (190C)
VDD2=5.0V
VREF2=0.7V
VREF1=0~100%(VB-VREF2)
When increase VPTC, test OT is just from
“L” to “H”
VDD2=5.0V
VREF2=0.7V
VREF1=0~100%(VB-VREF2)
Test GATE output about 50% heating
power
Test Conditions
Type
0.467
VB-V
REF2
Unit
0.477
VB-V
REF2
0.488
VB-V
REF2
V
0.497
VB-V
REF2
0.506
VB-V
REF2
VOT
250
Voltage Level of resistor net (250C)
0.539
VB-V
REF2
V
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PT8A3252/54
5LED Ceramic Heating Controller
Functional Description
3 Input Buttons
On/Off:
This button will toggle Heating-on or
Heating-off. Once heating-on, the level 1 of 130C
temperature setting always be selected.
Up:
Temperature up adjustment button. Push Up-
button once, the temperature setting increases one
level until the highest level 5 is reached.
Down:
Temperature down adjustment button. Push
Down-button once, the temperature setting reduces
one level until the lowest level 1is reached.
5 LED Indicator (Internal)
LED1:
130C temperature setting (level 1)
LED2:
145C temperature setting (level 2)
LED3:
160C temperature setting (level 3)
LED4:
175C temperature setting (level 4)
LED5:
190C temperature setting (level 5)
Note:
The temperature range can be adjusted from
100C to 250C by external series resistance.
Reset
After power on the chip will be reset by internal POR
circuit, LED1~ LED5 are all disabled. GATE and OT
PIN output are low level.
Timer (only for PT8A3252)
Once IC enters Heating-on state, internal timer starts to
count. It timeouts and device will stop heating
automatically after 216000 clock period, ie. 1 hour for
60Hz and 1.2 hour for 50Hz.
Over-Heat Protection
Once heater loses control and reaches to 250C, the
Over-Heat protection function will be activated by
driving one SCR to melt the fuse immediately.
Application Circuit
Level 1
39K
10K
Level 2
10K
10K
Level 3
10K
39K
8.2~16K for 110V
5.6~12K for 220V
RS1
RS2
RA, RB: Temperature adjustment.
RX: Overshoot adjustment.
RS: Recover sensitivity adjustment
RS1
100
0.47~2.0K
RS2
12-07-0006
5
PT0233-1
07/06/12
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