Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 DESCRIPTION PT2248 is an infrared remote control transmitter utilizing CMOS Technology. It is capable of 18 functions and a total of 75 commands. Single-shot and continuous keys are available. Furthermore, multiple keying is possible. FEATURES • • • • • • CMOS Technology Low Power Consumption Wide Range of Operating Supply Voltage allows Low Voltage Operation (Vcc=2.2 ~ 5.0V) Multiple Keying is Possible (Maximum of 6 Keys) Less External Components An Oscillator can be constructed by connecting a ceramic resonator at the oscillation circuit APPLICATIONS • Television (TV) Remote Control Transmitter • Video Cassette Recorder (VCR) Remote Control Transmitter PT2248 V2.7 -1- June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 BLOCK DIAGRAM VS S VCC 1 XT 16 2 OSC /XT 3 K1 4 K2 5 K3 6 K4 7 K5 8 K6 9 O u tput Sy nthe si zi ng Ci rc ui t DIi vi der De co der 15 /TX OUT 14 /TE ST Hol d Si gna l G e ner ato r K ey In put Ci rc ui t C ode B it Si gna l G e ner ati ng Ci rc ui t Ti min g Si gna l G e ner ati ng Ci rc ui t 10 11 12 13 T1 T2 T3 CODE PIN CONFIGURATION VS S 1 XT /XT K1 2 3 K2 5 6 K3 K4 K5 16 15 14 13 4 VCC /TX OUT /TE ST CODE T3 7 12 11 10 T2 T1 8 9 K6 PT2248 PT2248 V2.7 -2- June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 PIN DESCRIPTION Pin Name VSS VCC Pin No. 1 16 I/O XT, /XT 2, 3 I, O K1 ~ K6 4~9 I T1 ~ T3 10 ~ 12 O /CODE 13 I TEST 14 I TXOUT 15 O PT2248 V2.7 Description Negative Supply Voltage Terminal Positive Supply Voltage Terminal OSC Input/Output Terminal for OSC, and used for connecting a 455KHz ceramic resonator, etc. Key Code Input. 18 Keys can be connected Key Input Terminals for Key Matrix at T1 ~ T3 x K1 ~ K6 Scan Key Code Output. (with a built-in pull-down Digital Timing Output Terminals for resistor) Key Matrix Tx/Rx matching Code Common. Terminal for matching code between transmitting and receiving. Transmitter Key Code Testing Function. Keep this terminal open. Transmitting Signal Output. Transmitting signal consists of 12-bit per word and is modulated by a 38KHz carrier wave. -3- June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 FUNCTION DESCRIPTION OSCILLATION CIRCUIT When the self-bias type amplifier is housed by CMOS inverter method, the oscillation circuit can be constructed when a ceramic resonator has been connected. Rf 2 C1 3 C2 Cer am ic Res on ator 45 5K Hz C1 , C2 = 120 pF ~ 150p F When the oscillation frequency is set at 455KHz, the carrier wave of the transmitting signal is set at 38KHz. Unless the keys are being operated, the oscillation is normally stopped; thereby, reducing power consumption. KEY INPUT 18 Keys can be connected by Key Inputs K1 ~ K6 and timing signals T1 ~ T3. Multiple Keying (maximum of 6 keys) is possible for the keys connected to T1 line (Output becomes continuous pulses). The order of priority of the timing signal line is T1, T2, and T3. When 2 or more keys that are connected to T2 (or T3) line are pressed simultaneously, the single output will have the preferential order of K1 ~ K6. Furthermore, the keys connected to T2 and T3 lines are for single signals and no second signal is transmitted unless input is made after the key is released once. PT2248 V2.7 -4- June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 KEY MATRIX KEY NO. 1~ 6 These are continuous keys. Multiple Keying is possible. KEY NO. 7 ~ 18 These are single-shot keys. When an input is made, there is only one signal output. T1 T2 T3 K1 1 7 13 K2 2 8 14 K3 3 9 15 K4 4 10 16 K5 5 11 17 K6 6 12 18 (H) (S1) (S2) TRANSMISSION COMMAND The Transmission Command consists of one Command Word. One Command Word is composed of Code Bits (3-bit), Continuous Code (1-bit), Single-Shot Code (2-bit) and the Key Input Code (6-bit). Thus, one Command Word has 12-bit. C1 ~ C3 are code bits that are adaptable to many models. “H” indicates the continuous signal code while “S1” and “S2” are single-shot signal codes. D1 ~ D6 are key input data codes in 6 bits. C1 C2 C3 C o d e B it s PT2248 V2.7 H S1 S2 C o n t inu o u s S in g le -S h o t C o de -5- D1 D2 D3 D4 D5 D6 K e y I n pu t C o d e June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 DATA CODE Key No. 1 2 3 4 5 6 7 8 9 H 1 1 1 1 1 1 0 0 0 S1 0 0 0 0 0 0 1 1 1 S2 0 0 0 0 0 0 0 0 0 D1 1 0 0 0 0 0 1 0 0 Data D2 0 1 0 0 0 0 0 1 0 D3 0 0 1 0 0 0 0 0 1 D4 0 0 0 1 0 0 0 0 0 D5 0 0 0 0 1 0 0 0 0 D6 0 0 0 0 0 1 0 0 0 Output Form Continuous Continuous Continuous Continuous Continuous Continuous Single-Shot Single-Shot Single-Shot Key No. 10 11 12 13 14 15 16 17 18 H 0 0 0 0 0 0 0 0 0 S1 1 1 1 0 0 0 0 0 0 S2 0 0 0 1 1 1 1 1 1 D1 0 0 0 1 0 0 0 0 0 Data D2 0 0 0 0 1 0 0 0 0 D3 0 0 0 0 0 1 0 0 0 D4 1 0 0 0 00 0 1 0 0 D5 0 1 0 0 0 0 0 1 0 D6 0 0 1 0 0 0 0 0 2 Output Form Single-Shot Single-Shot Single-Shot Single-Shot Single-Shot Single-Shot Single-Shot Single-Shot Single-Shot Since multiple keying is possible, Key No. 1 ~ 6 (in combination with D1 ~ D6 data) are capable of sending out 63 commands. Key No. 7 ~ 18 are single-shot keys capable of sending out 12 commands. Thus, a total of 75 commands can result from a combination of continuous keys (multiple keying) and single-shot keys. CODE BITS (C1, C2 AND C3) Code bits can be made at one terminal with diodes connected through T1 ~ T3 timing terminals. Data of C1, C2 and C3 Code Bits become “1” when diodes are connected to CODE Terminal through the timing signal terminals -- T1 ~ T3, and “0” when diodes are not connected. CO D E T3 ( C3 ) T2 ( C2 ) T1 ( C1 ) In the diagram above: C1, C2 and C3 are 1, 1, and 1 data respectively. PT2248 has three (3) Code Bits. The receiving IC -- PT 2249A Series (DIP 16 Pins) can only use C2 and C3 Code Bits, while PT 2250A Series (DIP 24 Pins) are able to use only C1 and C2 Code Bits. Therefore, diodes must be connected so that PT2248 Code Bits Data match with that of the receiving IC. PT2248 V2.7 -6- June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 The PT2248 Code Bits Connection Table for PT 2249A / PT 2250A Series Application is given below: Rx PT2248 Code Pin T1 (C1 Code) T2 (C2 Code) T3 (C3 Code) PT2249A PT2250A Diode C2 C3 C1 C2 Diode Note: where C1, C2, C3 will be “1” if one diode is connected between CODE and Tn pins; n=1 to 3 in PT2248; otherwise, it will be set to “0”. Note: When communicating with any of the PT2249A Series Receivers, C1 Code Bit Data is not used. Therefore, it is necessary to connect diodes to the Code terminal corresponding to C1 Code Bit of PT2248. (In this way, the C1 Code Bit of PT2248 transmits “1”. Likewise, when communicating with any of the PT2250A Series Receivers, C3 Code Bit is not used. Therefore, it is necessary to connect diodes to the Code Terminal corresponding to the C3 Code Bit of PT2248.) TRANSMITTING WAVEFORM a 3a Co de Bi t Con tinu ous / S ingl e- Sh ot Code K ey Inp ut Cod e 48 a The diagram above shows the basic transmitting waveform. A basic transmitting waveform consists of 12-bits serial data. The time of bit “a” is dependent on the oscillation frequency (fosc) and is given by the following formula: a= 1 x 192 fosc PT2248 V2.7 -7- June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 DISTINCTION OD BIT “1” AND “0” a 3a B it "0 " B it "1 " 3a 0 1 0 a 1 1 0 0 1 0 0 0 1 One word of the transmission command is in the configuration of (010110010001). SINGLE-SHOT SIGNAL Com ma nd Cod e P T 2248 K ey O n /T X OU T 60 a 48 a Dupl ic ate of Com ma nd Cod e 80 a 48 a 2 Co mm and W or ds When any one of the single-shot keys is depressed, the above single-shot transmits only 2 command words and then the transmitting output ends. PT2248 V2.7 -8- June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 CONTINUOUS SIGNAL P T 2248 K ey O n /T X OU T 48 a 80 a 48 a 2 Co mm and W or ds 20 8a 48 a 80 a 48 a P aus e When any of the continuous keys is depressed, the above continuous signal transmits a repetitive cycle of 2 command words and then a pause (with a pause duration of 208a) until the key is released. If the key is released during code transmission, PT2248 will still continue to send out the last set of 2 command words and then the transmitting output stops. Please refer to the diagram below: P T 2248 K ey O n 48a /T X O UT 80a 48a 2 Co mm and W or ds 208a P aus e 48a 80a 48a 48a 80a 48a 2 Co mm and W or ds CARRIER WAVE About 50 ~ 100mA current is normally applied through an infrared LED in order to extend the infrared reaching distance. Therefore, reducing the time when the LED is ON leads to the reduction of power consumption. On PT2248, when the signal is transmitting, each bit is switching by a carrier wave of 1/3 duty. Carrier frequency (fc) is dependent on the oscillation frequency (fosc) and is given by the following formula: fosc a= (Hz) 12 where: fc = 38KHz at fosc = 455KHz Tr an s m it tin g S ig n a l P u ls e M od u la te d Tra n s mit t in g S ig na l PT2248 V2.7 -9- June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 ABSOLUTE MAXIMUM RATINGS (Ta=25℃) Parameter Supply Voltage Input/Output Voltage Power Dissipation Operating Temperature Storage Temperature Txout Output Current Symbol Vcc VIN Pd Topr Tstg Iout Ratings 5.5 Vss-0.5 to Vcc+0.5 200 -40 ~ +85 -65~+150 -5 Unit V V mV ℃ ℃ mA ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vcc=3V, Ta=25℃) Parameter Symbol Conditions All Function Operations Key On Without Load All Keys Off, Stops oscillation Min. Typ. Max. Unit 2.2 - 5.0 V - - 1.0 mA - 1.0 10 µA VIH - 0.8Vcc - Vcc V VIL - 0 - 0.5 V IIH VI=3.0V 20 40 60 µA IIL VI=0V -1.0 - 1.0 µA IOH Vo=2.0V -500 - - µA IOL Vo=2.0V 30 - - µA IOH Vo=2.0V -0.1 - - mA IOL Vo=2.0V 1.0 - - mA Rf fosc - 400 500 455 600 KΩ KHz Operating Supply Voltage Vcc Operating Supply Voltage Icc Stand-by Current K1~K6 ISTB Voltage CODE Input K1~K6 T1~T3 Current Current Output /TXOUT Current OSC Feedback Resistor Oscillation Frequency PT2248 V2.7 “H” Level “L” Level “H” Level “L” Level “H” Level “L” Level “H” Level ‘L” Level - 10 - June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 APPLICATION CIRCUIT 3V IR LED PNP IN4148 2Ω R 47 µf + - 16 15 14 13 Vcc /T XOUT /T EST CO DE 12 T3 11 T2 10 T1 9 K6 K2 5 K3 6 K4 7 K5 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 P T22 48 Vss 1 XT 2 /XT 3 K1 4 120p 455K 120p Pin No. 4 ~ 9 Pin No. 10 ~ 12 Notes: 1. R = 200Ω to 3.9KΩ 2. It is highly recommended that the 47µf capacitor be situated near the Vcc. PT2248 V2.7 - 11 - June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 ORDER INFORMATION PT2248 V2.7 Valid Part Number PT2248 Package Type 16 Pins, DIP, 300mil Top Code PT2248 PT2248-S 16 Pins, SOP, 300mil PT2248-S PT2248-SN 16 Pins, SOP, 150mil PT2248-SN - 12 - June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 PACKAGE INFORMATION 16 PINS, DIP, 300 MIL PT2248 V2.7 - 13 - June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter 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 0.000 0.115 PT2248 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 Notes: 1. All dimensions are in INCHES. 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-. “eB” and “eC” are measured at the lead tips with the loads unconstrained. 6. “N” is the number of terminal positions. (N=16) 7. Pointed or rounded lead tips are preferred to ease insertion. 8. “b2” and “b3” maximum dimensions are not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25 mm). 9. Distance between leads including Dambar protrusions to be 0.005 inch minimum. 10. Datum plane -H- coincident with the bottom of lead, where lead exits body. 11. Refer to JEDEC MS-001 Variation AB. JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION. PT2248 V2.7 - 14 - June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 16 PINS, SOP, 300 MIL Symbol A A1 B C D E e H h L α PT2248 V2.7 Min. Max 2.35 2.65 0.10 0.30 0.33 0.51 0.23 0.32 10.10 10.50 7.40 7.60 1.27 BSC. 10.00 10.65 0.25 0.75 0.40 1.27 o 0 8o - 15 - June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 Notes: 1. Dimensioning and tolerancing per ANSI Y14.5M-1982. 2. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold Flash, protrusion or gate burrs shall not exceed 0.15 mm (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 the 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. PT2248 V2.7 - 16 - June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 16 PINS, SOP, 150MIL PT2248 V2.7 - 17 - June, 2005 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter PT2248 PT2248 V2.7 June, 2005 - 18 - Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Infrared Remote Control Transmitter Symbol A A1 A2 b b1 c c1 D E E1 e L L1 L2 R R1 h θ θ1 θ2 Min. 1.35 0.10 1.25 0.31 0.28 0.17 0.17 0.40 0.07 0.07 0.25 0° 5° 0° PT2248 Typ. 9.90 BSC. 6.00 BSC. 3.90 BSC. 1.27 BSC. 1.04 REF. 0.25 BSC. - Max. 1.75 0.25 1.65 0.51 0.48 0.25 0.23 1.27 0.50 8° 15° - Notes: 1. Dimensioning and tolerancing per ANSI Y 14.5M-1994 2. Controlling Dimension: MILLIMETERS. 3. Dimension D does not include mold flash protrusions or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.15 mm (0.006 in) per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.25mm per side. D and E1 dimensions are determined at datum H. 4. The package top may be smaller than the package bottom. Dimensions D and E1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 5. Datums A & B to be determined at datum H. 6. N is the number of terminal positions. (N=16) 7. The dimensions apply to the flat section of the lead between 0.10 to 0.25mm from the lead tip. 8. Dimension “b” does not include dambar protrusion. Allowable dambar protrusion shall be 0.10mm total in excess of the “b” dimension at maximum material condition. The dambar cannot be located on the lower radius of the foot. 9. This chamfer feature is optional. If it is not present, then a pin 1 identifier must be located within the index area indicated. 10. Refer to JEDEC MS-012, Variation AC. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION. PT2248 V2.7 - 19 - June, 2005