PT8A3514/15/16/17/18/19(C/D)
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Smart Iron Controller
Features
Build in RC oscillator for sensor signal detection
On chip shunt regulated power supply
Using AC 60Hz/50Hz as timer clock can select by
Part No.
Accurate timer with error dropping in
±1%
Sensitive movement detection
Powerful immunity of sensor Vibration
30s time out for IRON in static horizontal position
8min/10min/15min time out for IRON in static
vertical position
LED to indicate operation status
Usable in both 120V and 240V voltage supply
system
Quick function test mode
Support buzzer
Relay off and LED keeps on until movement
sensor be detected after power on
Few external components
System standby mode power dissipation less than
1W (Base on recommended application circuits)
DIP-8 and SOIC-8 package
Patent No: ZL 2005 2 0048330.4
LED
GND
3
4
6 SW
5 TEST
Description
The PT8A3514/15/16/17/18/19(C/D) are high
performance low power and low cost CMOS chips
designed for intelligent electric IRON controller. Their
intelligence mainly results from their sensitive
detection to the movement and static position of
electric iron by using a special sensor. With the sensor,
these chips can detect the vertical/horizontal position
and movement status of IRON.
These chips are equipped with on-chip shunt
regulator, sensor signal processor, build-in oscillator,
timer, logic control, power on reset and output driving
block etc.
Applications
Electric Iron Controller
Pin Assignment
DISC/BUZ
RELAY
1
2
8 VCC
7 ACCLK
Fig1 PT8A351x pin assigment
Pin Description
Pin No.
1
2
3
Pin Name
DISC/BUZ
RELAY
LED
I/O
O
O
O
Description
Discharge the external electrolytic cap to stabilize and limit its voltage. Output
4KHz to driver buzzer when timer is out. Active high.
Relay drive output, active high.
With open drain output, it can shut off external LED in parallel with this open-drain
transistor, active low.
Ground.
Low for test mode*.
Sensor signal input, input high will be considered horizontal.
AC 60/50Hz signal for clock with Schmitt architecture, internal drop down.
Power supply.
30s
3s
8min
9.6s
10min
9.6s
15min
12s
PT0336-1
1
07/06/12
4
GND
-
5
TEST
I
6
SW
I
7
ACCLK
I
8
VCC
-
*Note: Teat mode comparison table:
Real timer
Test timer
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PT8A3514/15/16/17/18/19(C/D)
Smart Iron Controller
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Block Diagram
VCC
Sensor signal
processor
Power on
reset
GND
SW
SWO
Logic Control
Circuit
RELAY
LED
DISC/BUZ
ACCLK
System
oscillator
30s/8/10/15min
Timer
TEST
PT8A3513/4/5/6/7/8/9
Figure 2. Function Block Diagram
Maximum Ratings
Storage Temperature………………………………………… - 40
o
C to +125
o
C
Supply Voltage to Ground Potential (Inputs & V
CC
only)….. - 0.5 to V
CC
+0.5V
Supply Voltage to Ground Potential (Outputs & D/O only)... - 0.5 to V
CC
+0.5V
DC Input Voltage …………………………………………...- 0.5V to V
CC
+0.5V
DC Output Current ………………………………………………………..20mA
Power Dissipation………………………………………………………..500mW
Recommended Operating Conditions
Symbol
V
CC
T
A
Description
Supply voltage
Operating Temperature
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
4.5
-10
Typical
5
25
Max
5.5
85
Unit
V
C
Electrical Characteristics
(T
A
= -10 ~ 85º unless otherwise noted)
C,
Sym
V
CC
I
IL1
I
IL2
I
IL3
I
IH1
I
IH2
I
IH3
I
OH1
I
OL1
I
OL2
I
CC
V
POR
Parameter
Internal Shunt regulator voltage
Input low current(ACCLK)
Input low current(TEST)
Input low current(SW)
Input high current(ACCLK)
Input high current(ACSEL)
Input high current(SW)
Output Source Current (RELAY /DISC)
Output Sink Current
(RELAY /DISC)
Output Sink Current (LED)
Power supply current
Power on reset voltage.
Test Conditions
V
CC
Condition
-
-
5V
V
IL
=0V
5V
V
IL
=0V
5V
V
IL
=0V
5V
V
IH
=5V
5V
V
IH
=5V
5V
V
IH
=5V
5V
V
OH1
=2.5V
5V
5V
4V
-
V
OL1
=0.5V
V
OL2
=0.5V
See Figure 3
-
Min
4.5
-
-5
-
30
-
-
-0.3
5
10
-
1.6
Typ
5
-
-
-
-
-
-
-
-
-
-
-
Max
5.5
-1
-30
-1
100
30
1
-0.7
-
-
400
3.0
Unit
V
A
A
A
A
A
A
mA
mA
mA
A
V
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PT8A3514/15/16/17/18/19(C/D)
Smart Iron Controller
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Functional Description
(Refer to
Block Diagram)
The chip is comprised of several blocks: on-chip shunt regulator, sensor signal processor, build-in system oscillator,
30s/8min/10min/15min timer, logic control circuit, and power on reset, etc. Each block will be described as below.
Logic control circuit
Logic control circuit mainly carries out logic control function. It not only collects signals from other blocks, but also generates
various driving signals including RELAY&DISC. Besides, an external LED will flash at about 1Hz and a buzzer will make a
sound with a frequency of 4KHz every 0.5s for 6 times or continual after internal timer times out. Signals at RELAY will control
external relay to decide whether IRON heats or not.
Sensor signal processor
The core in the whole system is how to correctly detect the position and movement of sensor so that the system can be always
under safe control. Thus, it is critical to accurately and correctly deal with signal from sensor in different status and eliminate the
noise caused by debounce action from sensor. Here, a unique structure is used to do the high-requirement signal processing.
In real application of IRON, sensor needs to be installed according to certain requirements (for example its inclination).
Timer
Timer block mainly generates various timing signal according to the position of IRON.
It is easy to get accurate timer (30s/8min/10min/15min) by using AC 60Hz/50Hz signal as timing reference. As above description,
Iron in Horizontal position over 30s will stop heating. While Iron in vertical position over 8min/10min/ 15min will also stop
heating.
Buzzer
A buzzer will make 0.5S sound with a frequency of 4 KHz for 6 times or continual after internal timer timeouts.
LED
Whenever power on or heating, LED pin is floating and an external LED will turn on. After times out, LED pin outputs pulse and
an external LED will flash at about 1Hz.
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PT8A3514/15/16/17/18/19(C/D)
Smart Iron Controller
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Application Circuit
Note:
Suggest the parameters of relay meet the following specification: 24VDC, 1.6KΩ Coil resistance
R1
12K
R2
15K
D1
1N4007
R3
10K
D2
1N4148
2N5551
Q2
2N5551
Q1
IC1
1
2
DISC/BUZ
RELAY
LED
GND
VCC
ACCLK
SW
TEST
8
7
6
5
R4
100K
C2
22uF/16V
C3
104
240VAC
O UT
J1
RELAY
C1
10uF/100V
R5
100K
R6
1M
LED
3
4
240VAC
C4
103
R7
51.K
PT8A351x
SENSOR
Figure 1 Typical Application Circuit of PT8A351XC 240V
Figure 5 Typical Application Circuit of PT8A351x 240V/50Hz
D1
R1
6.8K
R3
100K
R2
10K
J1
RELAY
D2
1N4148
2N5551
Q2
2N5551
Q1
IC1
1
2
3
4
VCC
120VAC
OUT
1N4007
C2
22uF/16V
C3
104
R6
100K
8
7
6
5
R5
510K
C1
10uF/100V
DISC/BUZ
RELAY
LED
GND
VCC
ACCLK
SW
TEST
C4
103
R7
51K
LED
120VAC
PT8A351x
SENSOR
Figure 2 Typical Application Circuit of PT8A351XD 120V
Figure 6 Typical Application Circuit of PT8A351x 120V/60Hz
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PT8A3514/15/16/17/18/19(C/D)
Smart Iron Controller
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D1
R1
12K
R2
15K
D2
BUZ
Infrared LED
D2
1N4148
R3*
1.8K
R5
100K
240VAC
1N4007
20mm
R4*
8.2K
C3
104
2N5551
Q2
C2
22uF/16V
O UT
J1
RELAY
C1
10uF/100V
2N5551
Q1
R6
51K
IC1
1
2
3
4
DISC/BUZ
RELAY
LED
GND
VCC
ACCLK
SW
TEST
8
7
6
5
R7
1M
D3
C4
103
R8
51K
LED
PT8A351x
Photo Diode
240VAC
Figure 3 Typical Application Circuit of PT8A351XC 240V
Figure 7 Typical Application Circuit of PT8A351x 240V 50Hz
R1
6.8K
D1
1N4007
D2
BUZ
Infrared LED
D2
1N4148
R2*
1.8K
R4
100K
VCC
120VAC
20mm
R3*
8.2K
C3
104
2N5551
Q2
C2
22uF/16V
O UT
C1
10uF/100V
J1
RELAY
R5
51K
IC1
1
2
3
4
DISC/BUZ
RELAY
LED
GND
VCC
ACCLK
SW
TEST
8
7
6
5
R6
510K
2N5551
Q1
D3
C4
103
R8
51K
LED
PT8A351x
Photo Diode
120VAC
Figure 4 Typical Application Circuit
PT8A351x 120V 60Hz
Figure 8 Typical Application Circuit of
of PT8A351XD 120V
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