Datasheet

PT8A3251/53
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Ceramic Heating Controller
Features
Description

High watt density Alumina Heaters

High triggering current and double pulse trigger for
designed for ceramic heating controller. The chip offers
SCR
6 different default heat temperature settings including
Enhanced MHP Algorithm for Quickly Heating-Up
150C, 170C, 185C, 200C, 215C, 230C. And the
and Quickly Lost-Heat-Recover
temperature range can be adjusted through external

Uniform Heat to Maintain Constant Temperature
series resistance. The PT8A3251 has an internal timer; it

Adjustable to fit wide range heating plates
timeouts and device will stop heating automatically after

Adjustable to different Thermal Coefficient of
216000 clock period, ie. 1 hour for 60Hz and 1.2 hour
Resistively
for 50Hz. The PT8A3251/53 also has over temperature
Full compensation and insensitive to environment
protection function. The chip is enclosed in Lead free
temperature
DIP-16 and SOIC-16.


The PT8A3251/53 is a Mix-signal CMOS chip

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
1
16
L3
C1
2
15
L2
C2
3
14
L1
REF2
4
PT8A3251/33
13 VDD2
REF1
5
12 VDD1
PTC
6
11 VB
GATE
7
10 GND
OT
8
9 CLK
12-07-0006
PT0224-1
1
07/06/12
PT8A3251/53
Ceramic Heating Controller
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Pin Description
Pin No.
Pin Name
I/O
Pin Description
1
L4
I/O
2
C1
O
LED scan common driver.
3
C2
O
LED scan common driver.
4
REF2
I
Reference 2 for internal comparator.
5
REF1
I
Reference 1 for internal comparator.
6
PTC
I
Temperature sensor input.
7
GATE
O
SCR trigger output, active high.
8
OT
O
Over heat output, active high.
9
CLK
I
Clock input from power line.
10
GND
GND
11
VB
O
12
VDD1
Power
Power.
13
VDD2
Power
Power.
14
L1
I/O
On/Off key input and LED anode output.
15
L2
I/O
Down key input and LED anode output.
16
L3
I/O
Up key input and LED anode output.
Adjust Lost-heat-recover input and LED ON/OFF cathode output.
Ground.
PTC sampling power source.
Block Diagram
C1
C2
VB
L1
PT C
L2
Comp
Logic
Control
L3
L4
REF1
Ref Select
REF2
GAT E
CLK
OT
Comp
OSC
12-07-0006
PT0224-1
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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 & VDD 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 conditions above those indicated in the operational sections of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Recommended operation conditions
Sym
Parameter
Pin
Min
Typ
Max
Unit
VDD
TA
Operating Voltage
Operating temperature
VDD1, VDD2
-
4.0
-20
5.0
-
5.5
85
V
°C
DC Input Electrical Characteristics
Sym
Description
Test Conditions
PIN: PTC, CLK
IIH
Input high current
PIN: L1, L2, L3,
L4
PIN: PTC, CLK
PIN: L4
IIL
Input low current
PIN: L1, L2, L3
VIH
VIL
Input High Voltage
Input Low Voltage
VIT
Input Threshold Voltage
PIN: L1, L2, L3
PIN: L1, L2, L3
VT1_Level
VT2_Level
VIN = VDD
VIN = VDD
(L1, L2, L3, L4 is of
input)
VIN = GND
VIN = GND
(L4 is of input)
VDD =5.0V
VIN = 2.0V
(L1, L2, L3 is of
input)
L4
12-07-0006
Min
Type
Max
-
-
5
-
-
5
-
-
-5
-
-
-5
-0.16
-0.20
-0.24
mA
0.8 VDD
2.8
1.1
3.3
1.6
0.4 VDD
3.8
2.1
V
V
V
V
PT0224-1
3
Unit
A
A
07/06/12
PT8A3251/53
Ceramic Heating Controller
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DC Output Electrical Characteristics
Sym
Description
Test Conditions
PIN: GATE
PIN: OT
IOH
Output High Current
PIN: L1, L2, L3
PIN:C1
PIN:L4
PIN: GATE
PIN: OT
IOL
Output Low Current
PIN: C1, C2
PIN: L4
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
Type
Max
-3.0
-
-
-3.0
-
-
-0.8
-1
-1.2
-3.0
-
-
-3.0
-
-
4.0
-
-
4.0
-
-
4.0
-
-
0.8
1
1.2
Unit
mA
mA
Power Supply Characteristics
Sym
Description
Test Conditions
Min
Type
Max
Unit
VPOR
IDD
Voltage of POR
Current consumption
VDD
Supply voltage
TPOoff
Power off timer
No loading, V DD = 5.0V
Control function normal
FCLK= 50Hz
1.5
3.5
1.15
1.2
2.5
400
5.5
1.25
V
A
V
Hour
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Ceramic Heating Controller
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Temperature Control Characteristics
Sym
Description
VT230
Threshold Voltage Level
(150C)
Threshold Voltage Level
(170C)
Threshold Voltage Level
(185C)
Threshold Voltage Level
(200C)
Threshold Voltage Level
(215C)
Threshold Voltage Level
(230C)
VOT280
Voltage Level of
resistor net (280C)
VT150
VT170
VT185
VT200
VT215
VT150H
VT170H
VT185H
VT200H
VT215H
VT230H
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
Unit
0.482
VB-VREF2
0.494
VDD2=5.0V
VREF2=0.7V
VREF1=0~100%(VB-VREF2)
Test GATE output about 50% heating power
VB-VREF2
0.503
VB-VREF2
0.512
V
VB-VREF2
0.520
VB-VREF2
0.529
VB-VREF2
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-VREF2
VT150
+1.9%(VB-VREF2)
VT170
+1.7%(VB-VREF2)
VDD2=5.0V
VREF2=0.7V
VREF1=100%(VB-VREF2)
Test GATE output about 50% heating power
VT1850
+1.6%(VB-VREF2)
VT200
V
+1.5%(VB-VREF2)
VT215
+1.4%(VB-VREF2)
VT230
+1.3%(VB-VREF2)
12-07-0006
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Ceramic Heating Controller
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Functional Description


3 Input Buttons
On/Off: This button will toggle Heating-on or
Heating-off. Once heating-on, the level 4 of 200C
temperature setting always be selected.
Up: Temperature up adjustment button. Push Upbutton once, the temperature setting increases one
level until the highest level 6. Then after, Level 6 will
be kept.
Down: Temperature down adjustment button. Push
Down-button once, the temperature setting reduces
one level until the lowest level 1. Then after, Level 1
will be kept.

Reset
After power on the chip will be reset by POR circuit,
LED1~ LED7 are all disabled. GATE and OT PIN
output are low level.
 Timer (Only for PT8A3251)
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 280C, the
Over-Heat protection function will be activated by
driving one SCR to melt the fuse immediately.
7 LED Indicator
LED1: Heating-on or Heating-off
LED2: 150C temperature setting (level 1)
LED3: 170C temperature setting (level 2)
LED4: 185C temperature setting (level 3)
LED5: 200C temperature setting (level 4)
LED6: 215C temperature setting (level 5)
LED7: 230C temperature setting (level 6)
Note: The temperature range can be adjusted by
external series resistance.
Application Circuit
12-07-0006
PT0224-1
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07/06/12
PT8A3251/53
Ceramic Heating Controller
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Mechanical Information
PE (DIP-16)
PKG. DIMENSIONS(MM)
SYMBOL
Min
Max
A
3.71
4.31
A1
0.51
A2
3.20
3.60
B
0.38
0.57
B1
1.52 BSC
c
0.20
0.36
D
18.80
19.20
E
6.20
6.60
E1
7.32
7.92
e
2.54 BSC
L
3.00
3.60
Note:
1) Controlling dimensions in millimeters.
2) Ref : JEDEC MS-001D/BB
E2
12-07-0006
8.40
9.00
PT0224-1
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07/06/12
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Ceramic Heating Controller
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WE (SOIC-16)
PKG. DIMENSIONS(MM)
SYMBOL
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
A2
1.35
1.55
b
0.33
0.51
c
0.17
0.25
D
9.80
10.20
E
3.80
4.00
E1
5.80
6.20
e
1.27 BSC
L
0.40
1.27
θ
0°
8°
Note:
1) Controlling dimensions in millimeters.
2) Ref : JEDEC MS-012E/AC
Ordering Information
Ordering No.
PT8A3251PE
PT8A3251WE
PT8A3253PE
PT8A3253WE
Package Code
P
W
P
W
Package
Lead free DIP-16
Lead free SOIC-16
Lead free DIP-16
Lead free SOIC-16
Note:

E = Pb-free

Adding X Suffix= Tape/Reel
Pericom Semiconductor Corporation  1-800-435-2336  www.pericom.com
Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to
supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom
product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.
12-07-0006
PT0224-1
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