Data Sheet
PT8A3511/12
Smart Iron Controller
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Features
Description
•
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
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.
•
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
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
•
Ordering Information
Part Number
PT8A3511PE
PT8A3512PE
PT8A3511WE
PT8A3512WE
Electric Iron Controller
Function comparison table
Part No
PT8A3511
PT8A3512
Package
Lead free DIP-8
Lead free DIP-8
Lead free SOIC-8
Lead free SOIC-8
Clock Frequency
60 Hz
50 Hz
Block Diagram
VCC
sensor
SW
VCC
Power On
sensor signal
processor
GND
Re se t
Re layA
Logic control
Circuit
LED
Mode
30s/8min
Timer
System
Oscillator
DISC
ACCLK
PT8A3511/12
PS8A0102DE
Function Block Diagram
PT0228 (10/06)
Ver: 1
1
Data Sheet
PT8A3511/12
Smart Iron Controller
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Pad Assignment
DISC
RELAYA
1
8 VCC
2
7 ACCLK
PT8A351X
LED
3
6 SW
GND
4
5 MODE
Pad Description
Pin No.
Pin Name
I/O
Description
1
2
DISC
RELAYA
O
O
3
LED
O
4
GND
-
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.
5
MODE
I
Test mode select pin, internal pull up.
6
SW
I
Sensor signal input, internal pull up.
7
8
ACCLK
VCC
I
-
AC 60/50Hz signal for clock with schmitter architecture.
Power supply.
Functional Description (Refer to Block Diagram)
Here, we use a unique structure to do the high-requirement
signal processing.
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.
In real application of IRON, sensor firstly needs to be
installed according to certain requirements (for example its
inclination).
Logic control circuit
Timer
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.
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.
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.
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)
Ver: 1
2
Data Sheet
PT8A3511/12
Smart Iron Controller
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Maximum Rating
Storage Temperature………………………………………… - 40oC to +125oC
Supply Voltage to Ground Potential (Inputs & VCC only)….. - 0.5 to VCC +0.5V
Supply Voltage to Ground Potential (Outputs & D/O only)... - 0.5 to VCC +0.5V
DC Input Voltage …………………………………………...- 0.5V to VCC +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 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 Operating Conditions
Symbol
Description
Min
Typical
Max
Unit
VCC
Supply voltage
4.5
5
5.5
V
TA
Operating Temperature
-10
25
85
°C
Electrical Characteristics
(TA = -10 ~ 85ºC, unless otherwise noted)
Symbol
Parameter
VCC
IIL
IOH1
IOL1
IOL2
ICC
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
VCC
5V
VIL=0V
5V
VOH1=2.5V
5V
VOL1=0.5V
5V
VOL2=0.5V
4V
ACCLK=VCC
PT0228 (10/06)
Min
Typ
Max
Unit
4.5
-30
-0.3
0.5
10
-
5
-
5.5
-100
-1
400
V
µA
mA
mA
mA
µA
Ver: 1
3
Data Sheet
PT8A3511/12
Smart Iron Controller
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Application Circuit
Note: Suggest the parameter of relay meet the following specification: 24VDC, 1.6KΩ Coil resistance
R1
R2
12K
15K
D1
R4
100K
1N4007
22uF/16V
D2
1N4148
RELAY
24V
240VAC 50Hz
C3
104
C2
R3
10K
2N5551
Q2
2N5551
Q1
C1
10uF/100V
1
DISC
2
7
ACCLK
LED
4
8
VCC
RELAYA
3
LED
R5
1M
IC
PT8A3511/12
PT8A3512/PS8A0102A
6
SW
GND
C4
R6
103 33K
5
MODE
SENSOR
Figure 1 Typical Application Circuit of PT8A3511/12 240V
R1
6.8K
D1
R3
100K
1N4007
C2
120VAC 60Hz
R2
10K
C3
104
22uF/16V
D2
1N4148
RELAY
24V
2N5551
Q2
C1
2N5551
Q1
10uF/100V
1
2
3
LED
4
IC
PT8A3511/12
PT8A3511/PS8A0102B
DISC
RELAYA
LED
GND
VCC
ACCLK
SW
MODE
R4
510K
8
7
6
5
R5
C4 33K
103
SENSOR
Figure 2 Typical Application Circuit of PT8A3511/12 120V
PT0228 (10/06)
Ver: 1
4
Data Sheet
PT8A3511/12
Smart Iron Controller
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Mechanical Information
PE (DIP-8)
8
.240
.280
1
6.09
7.11
.355
.400
7.62
8.25
9.01
10.16
.300
.325
.210
Max
5.33
.008
.014
SEATING
PLANE
0.20
0.35
.015 Min
.115
.150
2.921
3.81
.100
typical
2.54
.014
.022
0.381
X.XX
X.XX
.356
.558
0O
15o
.430
Max
10.92
DENOTES DIMENSIONS
IN MILLIMETERS
Note:
1) Controlling dimensions in inches.
2) Ref: JEDEC MS-001 BA
PT0228 (10/06)
Ver: 1
5
Data Sheet
PT8A3511/12
Smart Iron Controller
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WE (SOIC-8)
8
.149 3.78
.157 3.99
.0099 0.25
x 45o
.0196 0.50
1
.189 4.80
.196 5.00
.016
.026
0.406
0.660
REF
.050
BSC
1.27
.0075 0.19
.0098 0.25
0-8o
0.40 .016
1.27 .050
.2284
.2440
5.80
6.20
.053 1.35
.068 1.75
SEATING PLANE
.0040 0.10
.0098 0.25
X.XX
X.XX
.013 0.330
.020 0.508
DENOTES DIMENSIONS
IN MILLIMETERS
Note:
1) Controlling dimensions in millimeters.
2) Ref: JEDEC MS-012 AA
PT0228 (10/06)
Ver: 1
6
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