DESCRIPTION APPLICATIONS FEATURES BLOCK DIAGRAM

PT2272
Remote Control Decoder
DESCRIPTION
PT2272 is a remote control decoder paired with
PT2262 utilizing CMOS Technology. It has 12-bit of
tri-state address pins providing a maximum of 531,441
(or 312) address codes; thereby, drastically reducing
any code collision and unauthorized code scanning
possibilities. PT2272 is available in several options to
suit every application need: variable number of data
output pins, latch or momentary output type.
APPLICATIONS
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FEATURES
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CMOS Technology
Low Power Consumption
Very High Noise Immunity
Up to 12 Tri-State Code Address Pins
Up to 6 Data Pins
Wide Range of Operating Voltage: VCC=4~15V
Single Resistor Oscillator
Latch or Momentary Output Type
Available in DIP and SOP
Car Security System
Garage Door Controller
Remote Control Fan
Home Security/Automation System
Remote Control Toys
Remote Control for Industrial Use
BLOCK DIAGRAM
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT2272
APPLICATION CIRCUIT
PT2272 (NO DATA) RF APPLICATION
PT2272 (4 DATA) RF APPLICATION CIRCUIT
PT2272 V3.8
-2-
July, 2011
PT2272
PT2272 (4 DATA) IR APPLICATION CIRCUIT
PT2272 V3.8
-3-
July, 2011
PT2272
ORDER INFORMATION
Valid Part No.
PT2272A-M2-S18
Package Type
18 PINS, SOP
Data Bits
2
Output Type
Momentary
Top Code
PT2272
Valid Part No.
PT2272
PT2272-L3
PT2272-L4
PT2272-L5
PT2272-M2
PT2272-M3
PT2272-M4
PT2272-M5
PT2272-M6
PT2272A-M2
Package Type
18 PINS, DIP
18 PINS, DIP
18 PINS, DIP
18 PINS, DIP
18 PINS, DIP
18 PINS, DIP
18 PINS, DIP
18 PINS, DIP
18 PINS, DIP
18 PINS, DIP
Data Bits
3
4
5
2
3
4
5
6
2
Output Type
*
Latch
Latch
Latch
Momentary
Momentary
Momentary
Momentary
Momentary
Momentary
Top Code
PT2272
PT2272-L3
PT2272-L4
PT2272-L5
PT2272-M2
PT2272-M3
PT2272-M4
PT2272-M5
PT2272-M6
PT2272A-M2
Valid Part No.
PT2272-S
PT2272-L3S
PT2272-L4S
PT2272-L5S
PT2272-L6S
PT2272-M2S
PT2272-M3S
PT2272-M4S
PT2272-M5S
PT2272-M6S
PT2272A-L2S
PT2272A-M2S
Package Type
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
20 PINS, SOP
Data Bits
3
4
5
6
2
3
4
5
6
2
2
Output Type
*
Latch
Latch
Latch
Latch
Momentary
Momentary
Momentary
Momentary
Momentary
Latch
Momentary
Top Code
PT2272-S
PT2272-L3S
PT2272-L4S
PT2272-L5S
PT2272-L6S
PT2272-M2S
PT2272-M3S
PT2272-M4S
PT2272-M5S
PT2272-M6S
PT2272A-L2S
PT2272A-M2S
Note: *=use VT (Valid Transmission).
PT2272 V3.8
-4-
July, 2011
PT2272
PIN CONFIGURATION
18 PINS
PT2272 V3.8
-5-
July, 2011
PT2272
20 PINS
PT2272 V3.8
-6-
July, 2011
PT2272
PIN DESCRIPTION
Pin Name
I/O
A0 ~ A5
I
A6/D5 ~ A11/D0
I/O
VSS
NC
-
DIN
I
OSC 1
I
OSC 2
O
VT
O
VCC
-
PT2272 V3.8
Description
Code Address Pin Nos.0 ~ 5.
These six tri-state pins are detected by PT2272 to determine
the encoded waveform bit 0 ~ bit 5. Each pin can be set to
“0”, “1”, or “f” (floating).
Code Address Pin Nos.6 ~ 11/Data Pin Nos.5 ~ 0.
These six pins are used as higher address input bits or data
output pins depending on the version (type) of PT2272 used.
When used as address inputs, these pins are tri-state input
pins and each pin can be set to “0”, “1”, or “f” (floating).
When used as output pins, these pins are driven to VCC if (1)
the address decoded from the waveform that was received
matches the address setting at the address input pins, and (2)
the corresponding data bits received is a “1” bit. Otherwise,
they are driven to VSS.
Negative Power Supply
No Connection
Data Input Pin.
The encoded waveform received is serially fed to
PT2272 at this pin.
A resistor connected between
Oscillator Pin No.1
these two pins determine the
fundamental frequency of
Oscillator Pin No.2
PT2272.
Valid Transmission.
Active High Signal. VT in high state signifies that
PT2272 receives valid transmission waveform.
Positive Power Supply
-7-
Pin No.
18pins
20pins
1~6
1~6
7~8
10 ~ 13
7~8
12 ~ 15
9
-
9
10 ~ 11
14
16
15
17
16
18
17
19
18
20
July, 2011
PT2272
FUNCTION DESCRIPTION
PT2272 decodes the waveform received and fed into the DIN pin. The Waveform is decoded into code word that contains
the address, data and sync bits. The decoded address bits are compared with the address set at the address input pins. If
both addresses match for 2 consecutive code words, PT2272 drives - (1) the data output pin(s) whose corresponding data
bit(s) is then decoded to be a “1” bit, and (2) the VT output -- to high voltage (high state).
RF OPERATION
CODE BITS
A Code Bit is the basic component of the encoded waveform, and can be classified as either an AD (Address/Data) Bit or a
SYNC (Synchronous) Bit.
Address/Data (AD) Bit Waveform
An AD Bit can be designated as Bit “0”, “1” or “f”, if it is in low, high or floating state respectively. One bit waveform consists
of 2 pulse cycles. Each pulse cycle has 16 oscillating time periods. For further details, please refer to the diagram below:
where: α=Oscillating Clock Period. Bit 1 is only available for Address Bit.
Synchronous (Sync.) Bit Waveform
The Synchronous Bit Waveform is 4 bits long with 1/8 bit width pulse. Please refer to the diagram below:
Note: 1 bit=32α
PT2272 V3.8
-8-
July, 2011
PT2272
CODE WORD
A group of Code Bits is called a Code Word. A Code Word consists of 12 AD bits followed by one Sync Bit. The 12 AD bits
are interpreted as either address or data bits depending on the PT2272 version used. Please refer to the diagrams below:
PT2272:
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
SYNC
PT2272A–M2/L2:
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
D1
D0
SYNC
PT2272–M3/L3:
A0
A1
A2
A3
A4
A5
A6
A7
A8
D2
D1
D0
SYNC
PT2272–M4/L4:
A0
A1
A2
A3
A4
A5
A6
A7
D3
D2
D1
D0
SYNC
PT2272–M5/L5:
A0
A1
A2
A3
A4
A5
A6
D4
D3
D2
D1
D0
SYNC
PT2272–M6/L6:
A0
A1
A2
A3
A4
A5
D5
D4
D3
D2
D1
D0
SYNC
One Complete Code Word
SINGLE RESISTOR OSCILLATOR
The built-in oscillator circuitry of PT2272 allows a precision oscillator to be constructed with only an external resistor. For
the PT2272 to decode correctly the waveform that was received, the oscillator frequency of PT2272 must be 2.5~8 times
that of the transmitting PT2262. It is a good practice to center the PT2272 oscillator frequency in this window to gain best
window margin at both sides. The typical oscillator with various resistor values is shown below for both PT2262 and
PT2272.
Encoder OSC Frequency
Decoder OSC Frequency
Suggested oscillator resistor values are shown below.
PT2262
4.7MΩ
3.3MΩ
1.2MΩ
PT2272
820KΩ *
680KΩ *
200KΩ **
Note:
* -- Operates when PT2272's VCC=5V to 15V
** -- Operates when PT2272's VCC= 4V to 15V
This means that if the PT2272 supply voltage is lower than 5V, you have to use a lower oscillator resistor value for both
PT2262 and PT2272.
PT2272 V3.8
-9-
July, 2011
PT2272
IR OPERATION
In the IR Type of Operation, the functions are similar to the above descriptions; except that the output waveform carried by
PT2262-IR has a frequency of 38KHz. Details are as follows.
CODE BITS
The Code Bits are further modulated with a 38KHz carrier frequency and can be “0”, “1” or “f” bit. Their waveforms are
shown in the diagram below.
Note: λ=2 clock lengths.
CODE WORD
A Code Word is made up of code bits and the format is the same as that of the RF Code Frame.
CODE FRAME
Likewise, a Code Frame is made up of Code Words and the format is the same as that of RF Type of Operation.
OSCILLATOR
PT2262-IR is specially designed for infrared remote control applications and its output waveform carries 38KHz frequency.
To get the 38KHz carrier frequency at the data output, the oscillator frequency must be 76KHz. A 440KΩ resistor connected
between OSC1 and OSC2 pins of PT2262-IR is recommended. Moreover, for a matching decoder frequency, 1MΩ resistor
connected between the OSC1 and OSC2 pins of PT2272 is also recommended.
VALID TRANSMISSION
When PT2272 receives a transmission code word, it initially checks whether this is a valid transmission. For a transmission
to be valid, (1) it must be a Complete Code Word, and (2) the Address Bits must match the Address Setting at the Address
Pins. After two consecutive valid transmissions, PT2272 (1) drives the data pins according to the data bits received, and (2)
raises VT to high voltage (high state).
The timings are shown in the following diagram.
Note:
ta=8 OSC clock width
tb=1 OSC clock width
tc=2 code word width
PT2272 V3.8
- 10 -
July, 2011
PT2272
LATCH OR MOMENTARY DATA OUTPUT TYPE
PT2272 uses either the latch or the momentary data output type depending on the PT2272 version
used. The latch type (PT2272-Lx) activates the data out during transmission and this data is sustained in the memory until
another data is inputted or entered. A momentary type (PT2272-Mx), on the other hand, activates the data out only during
transmission. In the momentary type, the data does not remain in the memory after the transmission is completed. Please
refer to the diagram below:
Note: T=2 code word width
PT2272 V3.8
- 11 -
July, 2011
PT2272
OPERATION FLOWCHART
DECODER WITHOUT DATA OUTPUT PIN
1. When Power is turned on, PT2272 activates the Stand-By Mode.
2. It then searches for signals. If there is no signal received, it remains in the Stand-By Mode;
otherwise, the address bits received are compared with the address configuration of the pins.
3. The VT goes high signifying the validation of transmission only when there are two (2) continuous
frames that contain matched address bits; otherwise, VT will not be activated and the Stand-By
Mode remains active.
4. Then, the Address Bits are again checked. Two continuous mismatches of the address bits would
disable the VT and make the Stand-By Mode active; otherwise, the address bits are continuously
checked.
PT2272 V3.8
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July, 2011
PT2272
DECODER WITH DATA OUTPUT PINS
1. When Power is turned ON, PT2272 activates the Stand-By Mode.
2. It then searches for signals. If there is no signal received, it remains in the Stand-By Mode;
otherwise, the address bits are compared with the address configuration of the pins.
3. Whenever the Address Bits in a Frame match with that of the Address Configuration of the Pin, the
data bits are stored into the memory. Also, when this IC finds two (2) continuous and identical data
having the same address bits, the data output(s) is activated and the VT is enabled. The VT is
disabled when there are 2 continuous mismatched addresses. For the momentary type, the data
output is reset; while for the latch type, the data output is sustained.
PT2272 V3.8
- 13 -
July, 2011
PT2272
ABSLOUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Storage Temperature
Symbol
VCC
VI
VO
Topr
Tstg
Rating
-0.3 ~ 16.0
-0.3 ~ VCC+0.3
-0.3 ~ VCC+0.3
-40 ~ +85
-65 ~ 150
Unit
V
V
V
℃
℃
DC ELECTRICAL CHARACTERISTICS
Parameter
Supply Voltage
Stand-by Current
DOUT Output Driving Current
DOUT Output Sinking Current
“H” Input Voltage
“L” Input Voltage
PT2272 V3.8
Symbol
VCC
ISB
IOH
IOL
VIH
VIL
Conditions
VCC=12V
DIN=0V
OSC1=0V
VCC=5V
VOH=3V
VCC=8V
VOH=4V
VCC=12V
VOH=6V
VCC=5V
VOH=3V
VCC=8V
VOH=4V
VCC=12V
VOH=6V
VCC
VCC
- 14 -
Min.
4
Typ.
-
Max.
15
Unit
V
-
0.1
1
μA
-3
-
-
mA
-6
-
-
mA
-10
-
-
mA
2
-
-
mA
5
-
-
mA
9
-
-
mA
0.7VCC
0
-
VCC
0.3VCC
V
V
July, 2011
PT2272
PACKAGE INFORMATION
18 PINS, SOP, 300MIL
Symbol
A
A1
A2
b
c
e
D
E
E1
L1
θ
Min.
0.10
2.05
0.31
0.20
0°
Nom.
1.27 BSC.
11.55 BSC.
10.30 BSC.
7.50 BSC.
1.40 REF.
-
Max.
2.65
0.30
0.51
0.33
8°
Notes:
1. Refer to JEDEC MS-013 AB.
2. Unit: mm.
PT2272 V3.8
- 15 -
July, 2011
PT2272
18 PINS, DIP, 300MIL
Symbol
A
A1
A2
b
c
e
D
E
E1
L
Min.
0.38
2.92
0.36
0.20
22.35
7.62
6.10
2.92
Nom.
3.30
2.54 BSC.
22.86
7.87
6.35
3.30
Max.
5.33
4.95
0.56
0.36
23.37
8.26
7.11
3.81
Notes:
1. Refer to JEDEC MS-001 AC.
2. Unit: mm.
PT2272 V3.8
- 16 -
July, 2011
PT2272
20 PINS, SOP, 300MIL
Symbol
A
A1
A2
c
e
D
H
E
L
θ
Min.
0.10
0.31
0.20
0.40
0°
Typ.
1.27 BSC.
12.80 BSC.
10.30 BSC.
7.50 BSC.
-
Max.
2.65
0.30
0.51
0.33
1.27
8°
Notes:
1. Refer to JEDEC MS-013 AC.
2. Unit: mm.
PT2272 V3.8
- 17 -
July, 2011