Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Receiver IC
PT2249A_PT2250A
DESCRIPTION
The PT2249A_PT2250A Series are infra-red remote control receivers utilizing CMOS Technology.
Remote Control System can be constructed together with the PT2248 remote control encoder. The
PT2249A Series are packaged in 16 pins DIP (PT2249A version is also available in SOP package) and
are capable of controlling 10 functions while the PT2250A Series are packaged in 24 pins DIP and are
capable of controlling 18 functions. Several options, inverting/non-inverting IR signal input and/or
dependent/independent cyclic (toggle) outputs, are provided to fit different application needs.
FEATURES
•
•
•
•
•
•
•
•
CMOS technology
Low power consumption
Very high noise immunity
Able to output parallel multiple keying signals sent from the transmitter (PT2249A is able to output
up to 5 functions simultaneously while PT2250A is able to output up to 6 functions simultaneously)
Outputs for single pulse, hold pulse and cyclic pulse are provided
A single terminal type oscillator by means of RC is provided
Code detection circuit prevents interference from various types of machines and apparatus
Digital filtering and code checking prevent interference from light sources such as PL lamp without
sacrificing the receiving sensitivity
APPLICATIONS
•
Audio equipment remote control
•
Television (TV) remote control
•
Video Cassette Recorder (VCR) remote control
PT2249A_PT2250A V2.6
-1-
May, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Receiver IC
PT2249A_PT2250A
BLOCK DIAGRAM
PT2249A_PT2250A V2.6
-2-
May, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Receiver IC
PT2249A_PT2250A
PIN CONFIGURATIONS
PT2249A_PT2250A V2.6
-3-
May, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Receiver IC
PT2249A_PT2250A
PIN DESCRIPTION
Pin Name
Vss
PT2249A
PT2249A-SN
1
Pin No.
PT2249AL
PT2249AHN
1
PT2250A
1
I/O
-
Description
Negative Power Supply
Receiver Input.
Instruction signal with carrier wave
eliminated should be inputted to
this pin. Input signal may be
optionally inverted before fed into
internal decoding circuit.
Hold Pulse.
As long as proper signal is
received, this output is held at “H”
level. (approximately 160ms will
be “0” after key is released.)
Cyclic Pulse.
When receiving signal is inputted,
CP1/CP2 is inversed. CP1 output
may be optionally governed by
(dependent to) the output state of
CP2. See Functional Description
for details.
Single Pulse.
When the receiving signal is
inputted, the active output will be
at “H” level only for a fixed
duration of time (approximately
107 msec), then it will return to “L”
level.
Tx/Rx Matching Code.
Transmitter Code is compared
with a code set at this terminals
and if matched, input is accepted.
OSC Input/Output.
A resistor and a capacitor are in
parallel connection between this
terminal and Vss.
Positive Power Supply
RXIN
2
2
2
I
HP1 ~ HP5
HP6
CP1
3~7
-
-
3~7
-
9
3~7
8
10
O
O
O
CP2
-
8
9
O
SP1 ~ SP3
SP4
SP5
SP6 ~ SP10
CODE1
CODE2
CODE3
OSC
Vcc
12 ~ 10
9
8
-
-
14
13
15
16
12 ~ 10
-
-
-
-
14
13
15
16
20 ~ 18
17
16
15 ~ 11
22
21
-
23
24
O
O
O
O
I
I
I
I/O
-
PT2249A_PT2250A V2.6
-4-
May, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Receiver IC
PT2249A_PT2250A
FUNCTIONAL DESCRIPTION
OSCILLATION CIRCUIT
Timing with transmitter signal and internal operating clock are all decided by this oscillator.
Using CMOS Technology, the oscillator of PT2248 transmitter is constructed through a combination of
a linear amplifier by connecting C and R between the oscillator terminal and Vss.
Notes:
1. R=39K±5%
2. C=100pF±5%
RECEIVING SIGNAL INPUT CIRCUIT
The signal is received by IR receiver module and the wave is infused into the IC.
The RXIN has a built-in Schmitt trigger circuit for shaping received signal waveform to eliminate
rounding. PTC has made available various options to suit IR receiving module with positive or negative
output. PT2249A Series / PT2250A Series with “N” Option was specially designed for IR modules with
negative output. PT2249A Series / PT2250A Series without the “N” Option were specially designed for
IR receiving modules with positive output. In these two options, IR signals without external inversion
can be fed into the RXIN directly.
PT2249A_PT2250A V2.6
-5-
May, 2007
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