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Remote Control Encoder
PT2268
DESCRIPTION
PT2268 is a remote control encoder utilizing CMOS Technology specially designed for use with the PT2128. Using a special coding technique, PT2268 increases noise immunity to a very great extent. It is housed in 16-Pins DIP Package and has a maximum of eight (8) input channels. Its high performance features make PT2268 a MUST in every fan and other electrical home appliance remote control application. PTC provides a new version of PT2268 which can be identified by the "B" mark on the lower right hand corner of the IC's topcode (beside the date code). Please refer to the diagram on the Order Information Section. The difference between the old and new version is the external application circuit in the OSC1 and OSC2 pins. (see Oscillator Section)
FEATURES
* * * * * * CMOS technology Low power consumption Very high noise immunity Wide range of operating voltage: Vcc=2.2 ~ 5.0V Transmits signals to a maximum of 8 channels Start word custom code options available (Please contact PTC for details.)
APPLICATIONS
* * * * Fan remote control Air cleaner Humidifier Heater
PT2268 V2.5
-1-
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
BLOCK DIAGRAM
OSC1 OSC OSC2 Timing Circuit
VCC
VSS
I1 I2 I3 I4 I5 I6 I7 I8
Encoder Key Input Scanning and Sampling
Output Waveform Generator
Tx OUT
C4
C5
C6
PT2268 V2.5
-2-
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
PIN CONFIGURATION
I1 I2 I3 I4 I5 I6 I7 I8 1 2 3 4 5 6 7 8 PT 2268 16 15 14 13 12 11 10 9 VC C OSC1 OSC1 T xOU T C4 C5 C6 VS S
PIN DESCRIPTION
Pin Name I1 ~ I8 VSS C4 ~ C5 C6 Tx OUT OSC1 OSC2 VCC I/O I I I O I O Description Key Input Pins. These pins are used to connect a maximum of 8 keys. (Each pin has a built-in pull-low resistor.) Negative Power Supply Select Input Pin for Start Word These pins have internal pull-low resistors. Select Input Pin for Start Word This pin has an internal pull-high resistor. Transmission Output Pin. This pin is an open drain (NMOS) output and is used to transmit signals. The carrier frequency is 38 KHz. Oscillator No.1 Pin These pins are used to externally connect a 455 KHz Ceramic Resonator Oscillator No.2 Pin Positive Power Supply Pin No. 1~8 9 12 ~ 11 10 13 15 14 16
PT2268 V2.5
-3-
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
FUNCTION DESCRIPTION
KEY INPUT
Up to eight (8) keys can be directly connected to pins I1 ~ I8. Please refer to the diagram below.
VCC I1 I2 I3 I4 I5 I6 I7 I8 PT2268
Furthermore, PT2268 has a built-in pull-low resistor of about 60K ~ 110K which reduces the need for external components.
OSCILLATOR
An oscillation circuit can be constructed using the CMOS Inverter and Built-in Feedback Resistor, 455KHz Crystal and two 220pF capacitors. The carrier frequency is 38KHz.
P T 2268 O S C1 O S C2
220pF
455KHz
220pF
Unless any of the 8 keys (I1 ~ I8) is being operated, the oscillation is automatically stopped. Thus, power consumption is considerably reduced.
PT2268 V2.5
-4-
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
TRANSMISSION WAVEFOM
When any of the 8 keys (I1 ~ I8) is set to "High", the TxOUT outputs one start word followed by 2 identical data words and a space. The code will be continuously outputted until the key is released. If for any reason, the key was released during the code transmission process, the code that is being transmitted during the key release action will still be completely outputted. Please refer to the following diagram.
I1 ~ I8
T x O UT
Start 1st 2nd Space Start 1st 2nd Space Word Word Word Word Word Word
Start 1st 2nd Space Word Word Word
20ms 80ms 1 Frame=80ms
Note: OSC=455KHz
TRANSMISSION CODE WAVEFORM
The transmission waveforms of the Start Word and the different Data Words generated when a specific input key (I1 ~ I8) is pressed are illustrated below (see also Transmission Code Pattern Section).
CLK START W1 W2 W3 W4 W5 W6 W7 W8
1 0
X 3X X X=0.625ms
PT2268 V2.5
-5-
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
TRANSMISSION CODE PATTERN
The transmission code pattern of PT2268 is given in the table below. Please refer to PT2265 transmission code pattern. Transmission Start Word Data Word (Key pressed) W1 W2 W3 W4 W5 W6 W7 W8 (I1) (I2) (I3) (I4) (I5) (I6) (I7) (I8) LSB C0 0 B0 0 0 0 1 1 1 1 1 C1 0 B1 0 1 1 0 0 0 1 1 C2 1 B2 1 0 1 0 1 1 0 0 C3 1 B3 1 1 0 1 0 1 0 1 C4 0 B4 1 1 0 1 0 0 0 0 C5 0 B5 0 0 0 1 1 0 1 0 C6 1 B6 1 0 1 0 1 0 0 1 MSB C7 1 B7 0 0 0 0 0 1 1 0 Receiver
0/p1 0/p2 0/p3 0/p4 0/p5 0/p6 0/p7 0/p8
START WORD CUSTOM CODE
The start word custom code has the following format: LSB 0 0 1 C3 C4 C5 C6 MSB 1
where: C3=1 (default value) =bonding option available C4="0" when floating or connected to VSS ="1" when connected to VCC C5="0" when floating or connected to VSS ="1" when connected to VCC C6="0" when connected to VSS = "1" when floating or connected to VCC Note: C4 and C5 have internal pull-low resistors while C6 has an internal pull-high resistor.
PT2268 V2.5
-6-
April, 2006
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Remote Control Encoder
The start word custom code table is given below: C3=0 Custom Code C6 (C0 TO C7) 0 00100001 1 00100011 0 00100101 1 00100111 0 00101001 1 00101011 0 00101101 1 00101111 C3=1(default) Custom Code (C0 TO C7) 00110001 00110011 00110101 00110111 00111001 00111011 00111101 00111111
PT2268
C4 0 0 0 0 1 1 1 1
C5 0 0 1 1 0 0 1 1
OPERATION FLOWCHART
Power On
Stand By
NO
Key Press? YES Enable Oscillator
Debounce
Code Correct? YES One Frame Code Transmit
NO
NO
Key Released?
YES
PT2268 V2.5
-7-
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
ABSOLUTE MAXIMUM RATINGS
Parameter Supply voltage Input/Output voltage Power dissipation Operating temperature Storage temperature Symbol Vcc Vin/Vout PD Topr Tstg Rating 0 ~ 6.0 Vss-0.2 ~ Vcc+0.3 500 -40 ~ +85 -65 ~ +150 Unit V V mW
ELECTRICAL CHARACTERISTICS
Normal Operating Condition: Ta=0 ~ +70, VCC-VSS=3V10% Parameter Symbol Condition Min. Operating voltage VCC 2.2 OSC On Operating current IOP TxOUT is floating. (See Note) I1 ~ I8="L" Stand-by current ISB OSC Stops. 0.5 TxOUT is floating. VOL=2.2 V, VDD=3V 8 Sinking current of TxOUT ISINK VOL=1.5 V, VDD=3V 4 VIH 0.7VCC Input voltage of I1 ~ I8 VIL 0 Input pull-low resistor RL 30 Input pull-high resistor RH 40 OSC frequency Typ. 3 500 1 15 6 50 90 455 Max. 5 1000 3 Unit V A A mA VCC 0.3VCC 80 150 V K K KHz
Note: For pins I1~I8: Any one of the said pins is set to HIGH while the others are set to LOW.
PT2268 V2.5
-8-
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
APPLICATION CIRCUIT
PT2268 IR Transmitter Application Circuit
+ 3V _ Battery
+
47F(see Layout Note)
I1
I2 I3 I4 I5 I6 I7 I8
Vcc
OS C1 OS C2 TX OUT C4 C5 C6 Vss
220pF 455KHz 220pF R PNP
IR LED
2
Notes: 1. C3 (default value)=1. For more details, please refer to Start Word Custom Code Section. 2. Resistor (R) is the Current Limit Impedance whose value must be greater than 220. Resistor (R) Recommended Value=1K Layout Note: Place 47F capacitor as near as possible to the PT2268's VSS Pin.
PT2268 V2.5
-9-
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
ORDER INFORMATION
Valid Part Number PT2268P8-Z PT2268Z PT2268Z-S Package Type 8 Pins, DIP, 300mil 16 Pins, DIP, 300mil 16 Pins, SOP, 300mil Top Code PT2268P8-Z PT2268Z PT2268Z-S
PT2268 V2.5
- 10 -
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
PACKAGE INFORMATION
8 PINS, DIP, 300MIL
PT2268 V2.5
- 11 -
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
Symbol A A1 A2 b b1 b2 b3 c c1 D D1 E E1 e eA eB eC L Min. 0.015 0.115 0.014 0.014 0.045 0.030 0.008 0.008 0.355 0.005 0.300 0.240 Nom. 0.130 0.018 0.018 0.060 0.039 0.010 0.010 0.365 0.310 0.250 0.100 BSC. 0.300 BSC. 0.130 Max. 0.210 0.195 0.022 0.020 0.070 0.045 0.014 0.011 0.400 0.325 0.280
PT2268
0.000 0.115
0.430 0.060 0.150
Notes: 1. Controlling Dimension: INCHES. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Symbols are defined in the "MO Series Symbol LIST" in Section 2.2 of Publication No.95. 4. Dimensions A, A1 and L are measured with the package seated in JEDEC Seating Plane Gauge GS-3. 5. D, D1 and E1 dimension do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch. 6. E and eA measured with the leads constrained to be perpendicular to data -C- . 7. eB and eC are measured at the lead tips with the leads unconstrained. 8. N is the number of leads (N=8). 9. Pointed or rounded lead tips are preferred to ease insertion. 10. b2 and b3 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 (0.25mm). 11. Variation BA has a b3 dimension and is 1/2 lead package. 12. Distance between the leads including dambar protrusions to be 0.005 inch minimum. 13. Datum plane -H- coincident with the bottom of lead where lead exits the body. 14. Refer to JEDEC MS-001 variation BA. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2268 V2.5 - 12 April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
16 PINS, DIP, 300MIL
PT2268 V2.5
- 13 -
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
Symbol A A1 A2 b b1 b2 b3 c c1 D D1 E E1 e eA eB eC L Min. 0.015 0.115 0.014 0.014 0.045 0.030 0.008 0.008 0.780 0.005 0.300 0.240 Nom. 0.130 0.018 0.018 0.060 0.039 0.010 0.010 0.790 0.310 0.250 0.100 bsc. 0.300 bsc. 0.130 Max. 0.210 0.195 0.022 0.020 0.070 0.045 0.014 0.011 0.800 0.325 0.280 0.430 0.060 0.150
PT2268
0.000 0.115
Notes: 1. All dimensions are in INCHS. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimensions "A", "A1" and "L" are measured with the package seated in JEDEC Seating Plane Gauge GS-3. 4. "D", "D1" and "E1" dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch. 5. "E" and "eA" measured with the leads constrained to be perpendicular to datum -c-. 6. "eB" and "eC" are measured at the lead tips with the loads unconstrained. 7. "N" is the number of terminal positions. (N=16) 8. Pointed or rounded lead tips are preferred to ease insertion. 9. "b2" and "b3" maximum dimensions are not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25 mm). 10. Distance between leads including Dambar protrusions to be 0.005 inch minimum. 11. Datum plane -H- coincident with the bottom of lead, where lead exits body. 12. Refer to JEDEC MS-001 Variation AB. JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2268 V2.5
- 14 -
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
16 PINS, SOP, 300MIL
Symbol A A1 B C D E e H h L
Min. 2.35 0.10 0.33 0.23 10.10 7.40 10.00 0.25 0.40 0
Nom.
Max. 2.65 0.30 0.51 0.32 10.50 7.60 10.65 0.75 1.27 8
1.27 bsc.
PT2268 V2.5
- 15 -
April, 2006
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Remote Control Encoder
PT2268
Notes: 1. Dimensioning and tolerancing per ANSI Y14.5-1982. 2. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold Flash protrusion or gate burrs shall not exceed 0.15mm (0.006 in) per side. 3. Dimension "E" does not include interlead flash or protrusions. Interlead flash or protrusions shall not exceed 0.25 mm (0.010 in) per side. 4. The chamfer on the body is optional. It is not present, a visual index feature must be located within the crosshatched area. 5. "L" is the length of the terminal for soldering to a substrate. 6. "N" is the number of terminal positions. (N=16) 7. The lead width "B" as measured 0.36 mm (0.014 in) or greater above the seating plane, shall not exceed a maximum value of 0.61 mm (0.24 in). 8. Controlling dimension: MILLIMETER. 9. Refer to JEDEC MS-013 Variation AA JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2268 V2.5
- 16 -
April, 2006

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