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Data Sheet
PT8A3511/12
Smart Iron Controller
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Build in RC oscillator for sensor signal detection
On chip shunt regulated power supply
Using AC 60Hz(PT8A3511)/50Hz(PT8A3512) as
timer clock set by user
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 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
Few external components
Lead free DIP-8 and SOIC-8 package
Description
The PT8A3511/12 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.
Application
•
Electric Iron Controller
Ordering Information
Part Number
PT8A3511PE
PT8A3512PE
PT8A3511WE
PT8A3512WE
Package
Lead free DIP-8
Lead free DIP-8
Lead free SOIC-8
Lead free SOIC-8
Function comparison table
Part No
PT8A3511
PT8A3512
Clock Frequency
60 Hz
50 Hz
Block Diagram
VCC
VCC
sensor signal
processor
Power On
Re se t
Re layA
Logic control
Circuit
DISC
LED
Mode
GND
sensor
SW
System
Oscillator
30s/8min
Timer
ACCLK
PT8A3511/12
PS8A0102DE
Function Block Diagram
PT0228 (10/06)
1
Ver: 1
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Data Sheet
PT8A3511/12
Smart Iron Controller
Pad Assignment
DISC
RELAYA
LED
GND
1
2
PT8A351X
3
4
6 SW
5 MODE
8 VCC
7 ACCLK
Pad Description
Pin No.
1
2
3
4
5
6
7
8
Pin Name
DISC
RELAYA
LED
GND
MODE
SW
ACCLK
VCC
I/O
O
O
O
-
I
I
I
-
Description
Discharge the external electrolytical cap to stabilize and limit its voltage.
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.
Test mode select pin, internal pull up.
Sensor signal input, internal pull up.
AC 60/50Hz signal for clock with schmitter architecture.
Power supply.
Functional Description
(Refer to
Block Diagram)
The chip is comprised of several blocks: on-chip shunt
regulator, sensor signal processor, build-in system oscillator,
DPLL, 30s/8min 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 RELAYA&DISC.
Besides, an external LED will flash at about 4Hz after internal
timer times out. Signals at RELAYA 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, we use a unique structure to do the high-requirement
signal processing.
In real application of IRON, sensor firstly 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) by using AC 60Hz
for PT8A3511 and 50Hz for PT8A3512 signal as timing
reference. As above description, Iron in Horizontal position
over 30s will stop heating. While Iron in vertical position over
8min will also stop heating.
LED
During 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 4Hz.
PT0228 (10/06)
2
Ver: 1
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Data Sheet
PT8A3511/12
Smart Iron Controller
Maximum Rating
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
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 Operating Conditions
Symbol
V
CC
T
A
Description
Supply voltage
Operating Temperature
Min
4.5
-10
Typical
5
25
Max
5.5
85
Unit
V
°C
Electrical Characteristics
(T
A
= -10 ~ 85ºC, unless otherwise noted)
Symbol
V
CC
I
IL
I
OH1
I
OL1
I
OL2
I
CC
Parameter
Internal shunt regulator voltage
Input low current (SW)
Output Source Current (RELAYA /Disc)
Output Sink Current (RELAYA/DISC)
Output Sink Current (LED)
Power supply current
Test Condition
Conditions
V
CC
-
-
5V
V
IL
=0V
5V
V
OH1
=2.5V
5V
V
OL1
=0.5V
5V
V
OL2
=0.5V
4V
ACCLK=VCC
Min
4.5
-30
-0.3
0.5
10
-
Typ
5
-
-
-
-
-
Max
5.5
-100
-1
-
-
400
Unit
V
µA
mA
mA
mA
µA
PT0228 (10/06)
3
Ver: 1
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Data Sheet
PT8A3511/12
Smart Iron Controller
Application Circuit
Note:
Suggest the parameter of relay meet the following specification: 24VDC, 1.6KΩ Coil resistance
R1
12K
R2
15K
D1
1N4007
R3
10K
RELAY
24V
D2
1N4148
2N5551
Q2
C1
10uF
/100V
2N5551
Q1
1
2
R4
100K
C2
22uF
/16V
C3
104
240VAC 50Hz
IC
PT8A3511/12
P 8A3512/P
T
S8A0102A
DISC
RELAYA
LED
GND
VCC
ACCLK
SW
MODE
R5
1M
8
7
6
5
LED
3
4
C4
R6
103 33K
SENSO
R
Figure 1 Typical Application Circuit of PT8A3511/12 240V
R1
6.8K
D1
1N4007
R2
10K
RELAY
24V
D2
1N4148
2N5551
Q2
C1
10uF
/100V
1
2
R3
100K
C2
22uF
/16V
C3
104
120VAC 60Hz
2N5551
Q1
IC
PT8A3511/12
P
T8A3511/P
S8A0102B
DISC
RELAYA
LED
GND
VCC
ACCLK
SW
MODE
R4
510K
8
7
6
5
LED
3
4
R5
C4 33K
103
SENSO
R
Figure 2 Typical Application Circuit of PT8A3511/12 120V
PT0228 (10/06)
4
Ver: 1
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Data Sheet
PT8A3511/12
Smart Iron Controller
Mechanical Information
PE (DIP-8)
8
.240
.280
6.09
7.11
1
.355
.400
9.01
10.16
7.62
8.25
.300
.325
.210
Max
5.33
SEATING
PLANE
.008
.014
0.20
0.35
.015 Min
0.381
X.XX
X.XX
Note:
1) Controlling dimensions in inches.
2) Ref: JEDEC MS-001 BA
0
O
15
o
.115
.150
2.921
3.81
.430
Max
10.92
.100
typical
2.54
.014
.022
.356
.558
DENOTES DIMENSIONS
IN MILLIMETERS
PT0228 (10/06)
5
Ver: 1
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