PT2260 Remote Control Encoder 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 310) 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 • • • • Home/Car security system Garage door controller Remote fan controller Remote control toys APPLICATIONS BLOCK DIAGRAM Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT2260 APPLICATION CIRCUIT UHF Band 4-Data Transmitter Circuit is recommended. PT2260 V1.5 -2- June, 2011 PT2260 ORDER INFORMATION Valid Part Number PT2260-R2 PT2260-R2S PT2260-R4S Package Type 16 Pins, DIP, 300mil 16 Pins, SOP, 150mil 16 Pins, SOP, 150mil Top Code PT2260-R2 PT2260-R2S PT2260-R4S Notes: 1. R: RF Application. 2. 2: 2 Data Pins; 4: 4 Data Pins. PIN CONFIGURATION PIN DESCRIPTION Pin Name I/O A0 ~ A7 I A8/D3 ~ A9/D2 I/PL* D1, D0 I/PL OSC I DOUT O Vcc Vss 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 10 ~ 11 12, 13 14 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 V1.5 -3- June, 2011 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: 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: Note: 1 bit=1024α PT2260 V1.5 -4- June, 2011 PT2260 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 determined by the corresponding states of A0 ~ A7, A8/D3, A9/D2, D1 and D0 pins at the time of transmission. When the Data Type of PT2260 is used, the address bits will decrease accordingly. For example: In the 4-Data Type where the address has eight (8) bits, the transmitting format is: 8 Address Bits 4 Data Bits Sync. bit PT2260 has a maximum of ten (10) Address Bits. The following diagram shows the code bits with their corresponding pins. A0 A1 A2 A3 A4 A5 A6 A7 A8/D3 A9/D2 D1 A0 SYNC. Bit One Complete Code Word 2 Data: 4 Data: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 D1 D0 Sync Bit A0 A1 A2 A3 A4 A5 A6 A7 D3 D2 D1 D0 Sync Bit The Code Bits A0 ~ A7, A8/D3, A9/D2, D1 and D0 are determined by the states set at these pins. For example, when the A0 (Pin No.1) is set to “1” (Vcc), the Code Bit A0 is synthesized as “1” bit. In the same manner, when it (A0 Pin) is set to “0” (Vss) or left floating, the Code Bit A0 is synthesized as a “0” or “f” bit respectively. When PT2260 detects “1” on any of the Data pins, it outputs a Code Word at DOUT. If the Data Pin is still in high state (“1”) the time the Code Word transmission ends, PT2260 outputs the same Code Word. Please refer to the diagram below: PT2260 V1.5 -5- June, 2011 PT2260 SINGLE OSCILLATOR The built-in oscillator circuitry of PT2260 allows a precision oscillator to be constructed by connecting an external resistor between OSC and Vcc pins. For PT2270 (or PT2272) to decode correctly the received waveform, the oscillator frequency of PT2270 (or PT2272) must be 1/16 ~ 4 (or 1/16 ~ 1/4) times that of the transmitting PT2260. The typical oscillator frequency with various resistor values for PT2260, PT2270, and PT2272 are shown below: Encoder (PT2260) OSC Frequency Decoder (PT2270) OSC Frequency 180 160 140 OSC Resistor = 510 K Ohms 100 OSC Resistor = 1.0 M Ohms Frequency(KHz) 120 80 OSC Resistor = 1.2 M Ohms 60 OSC Resistor = 2.2 M Ohms 40 20 0 0 5 10 Voltage(Vcc) 15 Decoder (PT2272) OSC Frequency Suggested Oscillator resistor values are shown below. PT2260 820KΩ 1MΩ 2MΩ PT2260 V1.5 PT2272 510KΩ 620KΩ 1.2MΩ -6- PT2270 1MΩ 1.2MΩ 2.2MΩ June, 2011 PT2260 OPERATION FLOWCHART PT2260 V1.5 -7- June, 2011 PT2260 ABSOLUTE MAXIMUM RATINGS Parameter Supply voltage Input voltage Output voltage Maximum power dissipation Operating temperature Storage temperature Symbol Vcc VI VO Pa Topr Tstg Conditions Vcc=10V Ratings -0.3 ~ 10.0 -0.3 ~ Vcc+0.3 -0.3 ~ Vcc+0.3 500 -40 ~ +85 -65 ~ +150 Unit V V V mW ℃ ℃ DC ELECTRICAL CHARACTERISTICS Parameter Supply voltage Symbol Vcc Stand-by current Isb DOUT output driving current IOH DOUT output sinking current IOL Operation current Iop PT2260 V1.5 Test Conditions Vcc=5V, OSC stops All input pins open Vcc=3V, VOH=1.5V Vcc=10V, VOH=5 V Vcc=3V, VOL=1.5V Vcc=10V, VOL=5V Vcc=1.8V Vcc=6.0V Vcc=10V -8- Min. 1.8 Typ. - Max. 10 Unit V 0.2 0.5 0.8 μA - - mA - - mA - - mA 2.5 20 4.6 24 0.01 0.50 1.60 June, 2011 PT2260 PACKAGE INFORMATION 16 PINS, DIP, 300MIL Symbol Min. Nom. Max. A A1 A2 b c e D E E1 L 0.38 2.92 0.36 0.20 3.30 2.54 BSC. 19.17 7.62 BSC 7.87 - 5.33 4.95 0.56 0.36 18.67 7.62 2.92 19.69 8.26 3.81 Notes: 1. Refer to JEDEC MO-001 BB 2. Unit: mm PT2260 V1.5 -9- June, 2011 PT2260 16 PINS, SOP, 150MIL Symbol A A1 A2 b c e D H E L θ Min. 1.35 0.08 1.20 0.31 0.16 0.40 0° Typ. 1.45 1.27 BSC. 9.90 BSC. 6.00 BSC. 3.90 BSC. - Max. 1.77 0.28 1.65 0.51 0.26 1.27 8° Notes: 1. Refer to JEDEC MO-001 BB 2. Unit: mm PT2260 V1.5 - 10 - June, 2011