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PT8A3252/54
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5LED Ceramic Heating Controller
Features
Description
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
Ceramic Heating Controller High watt density Alumina Heaters
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 temperature reached to 250C. The chip is packaged in lead free DIP-16 and SOIC-16.
Pin Configuration
L4 1 C1 2 C2 3 REF2 4 REF1 5 PTC 6 GATE 7 OT 8
PT8A3252/54
16 L3 15 L2 14 L1 13 VDD1 12 VDD2 11 VB 10 GND
9 CLK
12-07-0006
PT0233-1 07/06/12 1
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PT8A3252/54 5LED Ceramic Heating Controller
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Pin Description
Pin No. Pin Name I/O
Pin Description
1 L4 I/O Adjust input and LED output.
2 C1 O LED scan common driver.
3 C2 O LED scan common driver.
4 REF2 O 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.
9 CLK
I Clock input from power line.
10
GND
GND Ground.
11 VB
O PTC sampling power source.
12
VDD2
Power Power.
13
VDD1
Power Power.
14 L1 I/O On/Off key input and LED output.
15 L2 I/O Down key input and LED output.
16 L3 I/O Up key input and LED output.
Block Diagram
VB PTC
REF1 REF2 CLK
Comp Ref Select
Comp
Logic Co n t ro l
OSC
C1 C2 L1 L2 L3 L4
GAT E OT
12-07-0006
PT0233-1 07/06/12 2
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PT8A3252/54 5LED Ceramic Heating Controller
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Maximum Ratings
StorageTemperature...................................................................................-55oC to +150oC Ambient Temperaturewith Power applied...............................................-20oC to +85oC SupplyVoltage to Ground Potential(Input & VDD Only).........................-0.5Vto+6.5V SupplyVoltage to Ground Potential(Output s Only)................................-0.5Vto+6.5V DC Input Voltage .............................................................................................-0.5Vto +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
VDD TA
Parameter
Operating Voltage Operating temperature
Pin
Min
Typ
Max
Unit
VDD1, VDD2
4.0
5.0
6.0
V
-
-20 -
85 °C
DC Input Electrical Characteristics
Symbol
Description
Test Conditions
PIN: PTC, CLK
VIN = VDD
IIH
Input high current
PIN: L1, L2, L3,
VIN = VDD
(L1, L2, L3, L4 is of
L4
input)
PIN: PTC, CLK PIN: L4
VIN = GND VIN = GND (L4 is of input)
IIL Input low current
VDD =5.0V
PIN: L1, L2, L3
VIN = 2.0V .