PT8A2524-26/34-36/44-46
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Universal Timer Controller
Features
Auto-shut off output once time-out
Button to ON/OFF/RESET timer
Available timer with high precision same as AC
50/60hz
Build-in RC oscillator
Drive external RELAY
Support 50/60Hz by part
Quick Test Mode (QTM) for manufacturer
Available timer of 15/30/45/60/90/120/240/480min
Buzzer function(PT8A2524/25/34/35/44/45
Optional)
Low cost lead free package: TO94-4 or DIP-8 or
SOIC-8
Description
Universal timer is a mixed signal CMOS IC
designed for a fixed timer to drive external RELAY to
implement safety power control. It is applied to
120V/240V and 50/60Hz AC power supply. It can
automatically shut-off load in order to prevent undesired
conditions from the system. Internal timer can present
several kinds of different time: 15mins, 30mins, 45mins,
1hr, 1.5hrs, 2hrs, 4hrs and 8hrs, which is decided by part
number.
Applications
Universal Timer Controller
Pin Configuration
PT8A2524/5/6A-H
PT8A2534/5/6A-H
TO94-4(Top View)
PT8A2544/5/6
DIP-8 or SOIC-8
(Top View)
Pin Description
PT8A2524/5/6A-H, PT8A2534/5/6A-H
Pin Name
Pin No
I/O
Pin Description
GND
1
-
Ground
DISC
2
I/O Control output if discharging external capacitor and button input, high active
RELAY
3
I/O RELAY output and button input, high active
VCC
4
-
Power supply
PT8A2544/5/6
Pin Name
Pin No.
I/O
Pin Description
Timer selection pins(TS2 TS1 TS0 from 000~111)
TS2
1
I
000: 15m, 001: 30m, 010: 45m, 011: 60m,
TS1
2
I
100: 90m, 101: 120m,110: 240m,111: 480m
TS0
3
I
Default 011 by TS2 internal pull down, TS1&TS0 internal pull up
GND
4
-
Ground
DISC
5
I/O
Control output if discharging external capacitor and button input, high active
RELAY
6
I/O
RELAY output and button input, high active
50/60Hz selection pin: default is 60Hz by internal pull down; connecting to VCC is
ACSEL
7
I
50Hz.
VCC
8
-
Power supply
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PT0266-5
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PT8A2524-26/34-36/44-46
Universal Timer Controller
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Maximum Ratings
Storage Temperature ...................................................................................... -40oC to +125oC
Supply Voltage to Ground Potential (Input & V
CC
Only)............... -0.5V to V
CC
+ 0.5V
Supply Voltage to Ground Potential (Output s & D/O Only)........ -0.5V to V
CC
+ 0.5V
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.
Min
4.2
0
Typ
4.7
25
Max
5.2
85
Unit
V
Recommended operation conditions
Symbol
V
CC
T
A
Parameter
Operating Voltage
Operating temperature
Electrical Characteristics
Sym
V
CC
V
TH
I
OH
I
OL
I
CC
F
OSC
Parameter
Shunt Regulator output voltage
Input threshold(RELAY/DISC)
Output Source Current (RELAY/DISC)
Output Sink Current (RELAY/DISC)
Power supply current
Frequency of internal oscillator
Test Conditions
V
CC
Condition
-
I
CC
=1mA
5V
-
5V
V
OH
=0.7V
5V
V
OL
=0.5V
4.0V
-
5V
-
Min
4.2
0.3
-0.3
0.5
-
96
Typ
4.7
0.35
-0.5
-
-
128
Max
5.2
0.4
-1
-
0.5
160
Unit
V
V
mA
mA
mA
KHz
Block Diagram
ACSEL
Reference
circuit
Clock extracting
circuit
GND
VCC
Shunt
Regulator
Internal RC
Oscillator
Button sampling
circuit
PBO
RELAYdriving
circuit
DISC
RELAY
Timer Chain
15/30/45/60m/90m/2h/4h/8h
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01/03/14
PT8A2524-26/34-36/44-46
Universal Timer Controller
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Functional Description
(Note: In below description, “RELAY” presents a pin, while “relay” means a device.)
Clock extracting circuit
VCC is not only the power supply pin but also clock
source for internal precise timer. With the help of the
external circuit, the AC 50/60Hz clock signal can be
extracted to be used as timer clock source.
Internal RC oscillator circuit
It is employed to create pulse driving signal for RELAY,
it is a completely internal RC oscillator with frequency
of about 128KHZ.
Timer chain
Timer chain can be used to generate various timer
including 15/30/45/60/90/120/240/480min.
Button sampling circuit
With external buttons, ON/OFF/RESET function can be
realized. User can select one button with once ON, once
OFF or two buttons to turn ON or OFF separately, also
use one button to restart timer.
Button sampling circuit senses button’s operation 3 times
per 8ms. System will sample the button’s operation
during first 100ms after power on, if buttons are pressed
during this period, then system will start 3s timer to
check if the chip will enter into quick test mode (see test
mode section). If the related button is pressed over 3s
just after power on, chip will enter quick test mode as
soon as the button is released. If buttons are not pressed
during first 100ms, system will operate normally.
RELAY driving circuit
RELAY driving signal is special, anytime, first 8ms is
always high following output pulse signal with about
32KHZ and 25% duty cycle.
DISC is used to limit the voltage of external high voltage
capacitor by discharging it with a NPN transistor.
After power on, DISC should be active during first 1s
before RELAY in order to charge the external high
voltage capacitor.
RELAY is active to output first 8ms high following
32KHz with 25% duty cycle. When relay is OFF,
RELAY will output a narrow pulse each 8ms, while,
DISC is active to output 32KHz with 25% duty cycle.
For PT8A2524/2534 one button (RESET)
Button is tied to RELAY pin.
Pressing button RESET to turn on relay and restart
internal timer.
RELAY is active once the button is released.
DISC will output low when relay is ON.
Button is tied to RELAY pin, once ON, once OFF.
Pressing button ON/OFF to turn on/off relay and
start/reset internal timer.
RELAY is active when the button is pressed at first time.
DISC is active when the button is pressed at second time.
DISC outputs Low when relay is ON.
For PT8A2526/2536 two buttons (ON, OFF)
Button tied to DISC pin is for ON, Button tied to
RELAY pin is for OFF.
Pressing button ON to turn on relay and start internal
timer.
Pressing button OFF to turn off relay and reset internal
timer.
RELAY is active when button ON is pressed.
DISC is active when button OFF is pressed.
DISC will output a narrow pulse each 8ms when relay is
ON.
Buzzer
For PT8A2524/25/34/35/44/45, a buzzer will make 0.5s
sound with a frequency of 4KHz every 1s for 6 times
after internal timer times out. Pin DISC will output 4KHz
with 25% duty for 0.5s to let the buzzer work, then
output 32KHz with 25% duty for 0.5s, after the output 6
times 4KHz, DISC will keep output 32KHz.
Quick Test Mode(QTM)
In order to make the manufacturer’s test convenient,
quick test mode is designed to speed up the test.
QTM can be accessed by pressing button (ON or
RESET) over 3s (option 2s) once power on. It can exit
automatically after quick test timer is expired, system
needs to power on again to come back normal operation
after quick test mode. Any button operations will be
ignored in QTM.
Note:
For PT8A2526/2536, the button to be pressed over
3s to enter into QTM is OFF.
DISC is active
DISC
RELAY
RELAY is active
8ms
8ms
8ms
32KHz with 25% duty
8ms
8ms
Driving signals of RELAY and DISC
For PT8A2525/2535 one button (ON/OFF)
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Universal Timer Controller
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Operation illustration of entering into and exiting Quick test mode
Power on
<100ms
>3s
First PB ON
sampling time
Second PB ON
*12s for 2hrs
Quick test mode
3s warm up
will be ignored
Compare Table: Real timer and QTM timer
Real Timer
15m
30m
45m
60m
90m
120m
4h
8h
QTM Timer
2s
4s
6s
8s
10s
12s
14s
16s
Normal mode
Application Circuit
TO94 Universal Timer to drive RELAY with one button
D2
IN4007
D1
IN4007
R2
6.8K 1/2W*
27K 1/2W*
R1
R3
10K
C3
10uF/100V
ACL
LOAD
24K 1/2W*
100K 1/2W*
U1
PT8A2524/5-PT8A2534/5
DISC
2
4
VCC
C1
22uF/16V*
C2
104
Q1
2N5551
D3
IN4007
K1
120V/240V
RELAY
GND
3
S1
RE Tor ON/OFF
SE
Q2
2N5551
ACN
*Note1:
For 120VAC power supply system, R1 value is 24K, R2 value is 6.8K.
For 240VAC power supply system, R1 value is 100K, R2 value is 27K.
Note2:
C1 value range is 22uF to 68uF.
TO94 Universal Timer to drive RELAY &BUZ with one button
D2
IN4007
D1
IN4007
R2
6.8K 1/2W*
27K 1/2W*
R1
24K 1/2W*
100K 1/2W*
VCC
1
LOAD
C3
10uF/100V
U1
PT
8A2524/5_34/5
R3
1.8K
B1
20mm
D3
IN4148
K1
ACL
4
VCC
120V/240V
DISC
2
R4
8.2K
C1
22uF/16V *
C2
104
RELAY
GND
3
Q2
2N5551
Q1
2N5551
S1
RE T
SE
or ON/OFF
ACN
*Note1:
For 120VAC power supply system, R1 value is 24K, R2 value is 6.8K.
For 240VAC power supply system, R1 value is 100K, R2 value is 27K.
Note2:
C1 value range is 22uF to 68uF.
2013-12-0013
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PT8A2524-26/34-36/44-46
Universal Timer Controller
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TO94 Universal Timer to drive RELAY with two buttons
D2
IN4007
D1
IN4007
R2
6.8K 1/2W*
27K 1/2W*
R1
R3
10K
C3
10uF/100V
ACL
LOAD
24K 1/2W*
100K 1/2W*
U1
PT8A2526-PT8A2536
DISC
2
4
VCC
C1
C2
104
Q1
2N5551
D3
IN4007
K1
120V/240V
22uF/16V*
RELAY
GND
3
S1
ON
S2
OFF
Q2
2N5551
ACN
*Note1:
For 120VAC power supply system, R1 value is 24K, R2 value is 6.8K.
For 240VAC power supply system, R1 value is 100K, R2 value is 27K.
Note2:
C1 value range is 22uF to 68uF.
DIP8 Universal Timer to drive RELAY with one button
D2
IN4007
D1
IN4007
R2
6.8K 1/2W*
27K 1/2W*
R1
24K 1/2W*
100K 1/2W*
VCC
1
R3
10K
C3
10uF/100V
ACL
LOAD
U1
1
2
3
TS2
TS1
TS0
GND
VCC
ACSEL
RELAY
DISC
8
7
6
5
Q1
2N5551
D3
IN4007
K1
120V/240V
C1
22uF/16V*
C2
104
4
PT8A2544/5PE
Q2
2N5551
ACN
S1
RE Tor ON/OFF
SE
*Note1:
For 120VAC/60Hz power supply system, R1 value is 24K, R2 value is 6.8K, ACSEL is connected to GND or
floating.
For 240VAC/50Hz power supply system, R1 value is 100K, R2 value is 27K, ACSEL is connected to VCC.
*Note2:
TS0, TS1 and TS2 are floating, the timer time out is 60 minutes.
Note3:
C1 value range is 22uF to 68uF.
2013-12-0013
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PT0266-5
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