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PT8A3251/53
Ceramic Heating Controller
Features
Description
The PT8A3251/53 is a Mix-signal CMOS chip
designed for ceramic heating controller. The chip offers
6 different default heat temperature settings including
150C, 170C, 185C, 200C, 215C, 230C. And the
temperature range can be adjusted through external
series resistance. The PT8A3251 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 PT8A3251/53 also has over temperature
protection function. The chip is enclosed in Lead free
DIP-16 and SOIC-16.
High watt density Alumina Heaters
High triggering current and double pulse trigger for
SCR
Enhanced MHP Algorithm for Quickly Heating-Up
and Quickly Lost-Heat-Recover
Uniform Heat to Maintain Constant Temperature
Adjustable to fit wide range heating plates
Adjustable to different Thermal Coefficient of
Resistively
Full compensation and insensitive to environment
temperature
6 Heat Temperature Settings
Auto power off for PT8A3251
Over Temperature protection
Package: DIP-16 and SOIC-16 package
Applications
Ceramic Heating Controller
Pin Configuration
L4
C1
C2
REF2
REF1
PTC
GATE
OT
1
2
3
4
5
6
7
8
16
15
14
L3
L2
L1
PT8A3251/33
13 VDD2
12 VDD1
11 VB
10 GND
9 CLK
12-07-0006
1
PT0224-1
07/06/12
PT8A3251/53
Ceramic Heating Controller
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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
VDD1
VDD2
L1
L2
L3
I/O
I/O
O
O
I
I
I
O
O
I
GND
O
Power
Power
I/O
I/O
I/O
Pin Description
Adjust Lost-heat-recover input and LED ON/OFF cathode 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, active high.
Clock input from power line.
Ground.
PTC sampling power source.
Power.
Power.
On/Off key input and LED anode output.
Down key input and LED anode output.
Up key input and LED anode 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
2
PT0224-1
07/06/12
PT8A3251/53
Ceramic Heating Controller
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Maximum Ratings
Storage Temperature ................................................................................... -55oC to +150oC
Ambient Temperature with Power applied...............................................-40oC 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
5.5
85
Unit
V
°
C
DC Input Electrical Characteristics
Sym
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
-0.16
-0.20
-0.24
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
12-07-0006
3
PT0224-1
07/06/12
PT8A3251/53
Ceramic Heating Controller
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DC Output Electrical Characteristics
Sym
Description
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
Test Conditions
V
DD
= 5.0V
Vout = 4.5V
V
DD
= 5.0V
Vout = 4.5V
V
DD
= 5.0V
Vout = 2.2V
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 =2.8V
Min
-3.0
-3.0
-0.8
-3.0
-3.0
4.0
4.0
4.0
0.8
Type
-
-
-1
-
-
-
-
-
1
Max
-
-
-1.2
-
-
-
-
mA
-
1.2
mA
Unit
Power Supply Characteristics
Sym
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
-
3.5
1.15
Type
-
-
-
1.2
Max
2.5
400
5.5
1.25
Unit
V
A
V
Hour
V
DD
TPO
off
Supply voltage
Power off timer
12-07-0006
4
PT0224-1
07/06/12
PT8A3251/53
Ceramic Heating Controller
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Temperature Control Characteristics
Sym
VT
150
VT
170
VT
185
VT
200
VT
215
VT
230
Description
Threshold Voltage Level
(150C)
Threshold Voltage Level
(170C)
Threshold Voltage Level
(185C)
Threshold Voltage Level
(200C)
Threshold Voltage Level
(215C)
Threshold Voltage Level
(230C)
Voltage Level of
resistor net (280C)
Heat-up Threshold
Voltage Level (150C)
Heat-up Threshold
Voltage Level (170C)
Heat-up Threshold
Voltage Level (185C)
Heat-up Threshold
Voltage Level (200C)
Heat-up Threshold
Voltage Level (215C)
Heat-up Threshold
Voltage Level (230C)
Test Conditions
Type
0.482
VB-V
REF2
Unit
0.494
VDD2=5.0V
VREF2=0.7V
VREF1=0~100%(VB-VREF2)
Test GATE output about 50% heating power
VB-V
REF2
0.503
VB-V
REF2
0.512
VB-V
REF2
V
0.520
VB-V
REF2
0.529
VB-V
REF2
VOT
280
VDD2=5.0V
VREF2=0.7V
VREF1=0~100%(VB-VREF2)
When increase VPTC, test OT is just from “L” to “H”
0.554
VB-V
REF2
VT
150H
VT
170H
VT
185H
VT
200H
VT
215H
VT
230H
VT
150
+1.9%(VB-V
REF2
)
VT
170
+1.7%(VB-V
REF2
)
VDD2=5.0V
VREF2=0.7V
VREF1=100%(VB-VREF2)
Test GATE output about 50% heating power
VT
1850
+1.6%(VB-V
REF2
)
VT
200
+1.5%(VB-V
REF2
)
V
VT
215
+1.4%(VB-V
REF2
)
VT
230
+1.3%(VB-V
REF2
)
12-07-0006
5
PT0224-1
07/06/12
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