Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Encoder
PT2260
DESCRIPTION
PT2260 is a remote control encoder paired with either PT2270 or PT2272 utilizing CMOS Technology.
It encodes data and address pins into a serial coded waveform suitable for RF modulation. PT2260 has
a maximum of 10 bits tri-state address pins providing up to 59,049 (or 3
10
) address codes; thereby,
drastically reducing any code collision and unauthorized code scanning possibilities.
PT2260 is one of the first generation of Encoder/Decoder ICs that utilizes the unique PTC Technology.
When paired with PT2270, this encoder/decoder (PT2260/PT2270) pair can operate at very wide
temperature range (see Features). Thus, this very important feature enables your Encoder/Decoder to
operate under the worst environmental condition.
FEATURES
•
•
•
•
•
•
•
•
•
High performance CMOS technology
Low power consumption
Very high noise immunity
Wide operating temperature range: -40℃ ~ 85℃
8 or 10 Tri-State code address pins
2 or 4 data pins
Wider range of operating voltage: 1.8 ~ 10.0V
Single resistor oscillator
Least external components
APPLICATIONS
•
•
•
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Home/Car security system
Garage door controller
Remote fan controller
Remote control toys
PT2260 V1.4
-1-
April, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Encoder
PT2260
BLOCK DIAGRAM
A0
A1
A2
A3
A4
System
Timing
OSC
OSC
A5
A6
A7
A8/D3
A9/D2
D1
D0
Address/
Data
Control
Logic
Code
Generation
DOUT
PT2260 V1.4
-2-
April, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Encoder
PT2260
PIN CONFIGURATION
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
P T2260-R4
V
C C
DOUT
OSC
D0
D1
D2
D3
V
S S
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
P T2260-R2
V
C C
DOUT
OSC
D0
D1
A9
A8
V
S S
PT2260 V1.4
-3-
April, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Encoder
PT2260
PIN CONFIGURATION
Pin Name
A0 ~ A7
I/O
I
Description
Code Address Pin Nos. 0 ~ 7
These eight tri-state pins are detected by PT2260 to
determine the encoded waveform bit 0 ~ bit 7. Each bit can
be set to “0”, “1”, or “f” (floating).
Code Address Pin No. 8 ~ 9/Data Pin No. 3 ~ 2.
These two tri-state pins are detected by PT2260 to
determine the encoded waveform bit 8 ~ bit 9. When these
pins are used as address pins (as in PT2260-R2), they can
be set to “0”, “1”, or “f” (floating). When these pins are used
as data pins (as in PT2260-R4), they can only be set to “0”
or “1”.
Data Pin No. 1/0.
These pins can only be set to “0” or “1”
Oscillator Pin
A resistor connected between the Osc Pin and the Vcc
determines the fundamental frequency of the PT2260
Data Output Pin.
The encoded waveform is serially outputted to this pin.
When PT2260 is not transmitting, DOUT outputs low (Vss)
voltage
Positive Power Supply
Negative Power Supply
Pin No.
1~8
A8/D3 ~ A9/D2
I/PL*
10 ~ 11
D1, D0
OSC
I/PL
I
12, 13
14
DOUT
Vcc
Vss
O
15
16
9
Note:
PL -- Pull-low Resistor is connected internally
PL* -- If those two pins are used as Data Pins (PT2260-R2), pull-low resistor is connected internally;
otherwise, no pull-low resistor is connected.
PT2260 V1.4
-4-
April, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Encoder
PT2260
FUNCTION DESCRIPTION
PT2260 encodes the code address and data set at A0 ~ A7, A8/D3, A9/D2, D1 and D0 into a special
waveform and outputs it to the DOUT when any of the data pins is tied to high. This waveform is fed to
the RF modulator for transmission. The transmitted radio frequency is received by the RF demodulator
and reshaped into the special waveform. PT2270 (or PT2272) is then used to decode the waveform
and set the corresponding output pin(s). Thus completing a remote control encoding and decoding
function.
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 512 oscillating clock periods. For further
details, please refer to the diagram below:
α
O SC
1 b it = 1 0 24
α
B it " 0 "
B it " 1 "
3 8 4α
B it " f"
Flo a t ing
1 2 8α
1 2 8α
where:
α=Oscillating
Clock Period
Synchronous (Sync.) Bit Waveform
The Synchronous Bit Waveform is 4 bits long with 1/8 bit width pulse. Please refer to the diagram
below:
1 / 8 b it w id t h = 1 28
α
4 b its w idt h = 4 0 96
α
Note: 1 bit=1024α
PT2260 V1.4
-5-
April, 2006
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