PT2248_05 PTC | Alldatasheet

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Technical content

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 1 - June, 2005 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 allo ws 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

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 2 - June, 2005 Infrared Remote Control Transmitter PT2248 BLOCK DIAGRAM 1 16 10 11 12 13 XT /XT T1 T2 T3 CODE /TEST /TXOUT VCCVSS OSC DIivider Output Synthesizing Circuit Key Input Circuit Decoder Hold Signal Generator T iming Signal Generating Circuit Code Bi t Signal Generating Circuit PIN CONFIGURATION VSS XT /XT VCC /TXOUT /TEST K3 T2 K1 CODE K2 T3 1 16 2 15 3 14 41 3 71 0 6 11 5 12 PT2248

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 3 - June, 2005 Infrared Remote Control Transmitter PT2248 PIN DESCRIPTION Pin Name Pin No. I/O Description VSS 1 Negative Supply Voltage Terminal VCC 16 Positive Supply Voltage Terminal XT, /XT 2, 3 I, O OSC Input/Output Terminal for OSC, and used for connecting a 455KHz ceramic resonator, etc. K1 ~ K6 4 ~ 9 I Key Code Input. Key Input Terminals for Key Matrix

18 Keys can be connected

at T1 ~ T3 x K1 ~ K6 T1 ~ T3 10 ~ 12 O Scan Key Code Output. Digital Timing Output Terminals for Key Matrix (with a built-in pull-down resistor) /CODE 13 I Tx/Rx matching Code Common. Terminal for matching code between transmitting and receiving. TEST 14 I Transmitter Key Code Testing Function. Keep this terminal open. TXOUT 15 O Transmitting Signal Output. Transmitting signal consists of 12-bit per word and is modulated by a 38KHz carrier wave.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 4 - June, 2005 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. C1 C2 Rf Ceramic Resonator 455KHz C1, C2 = 120pF~150pF 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.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 5 - June, 2005 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 (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 H S1 S2 D1 D2 D3 D4 D5 D6 Code Bits Continuous Single-Shot Code Key Input Code

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 6 - June, 2005 Infrared Remote Control Transmitter PT2248 DATA CODE Data Data Key No. H S1 S2 D1 D2 D3 D4 D5 D6 Output Form Key No. H S1 S2 D1 D2 D3 D4 D5 D6 Output Form 1 1 0 0 1 0 0 0 0 0 Continuous 10 0 1 0 0 0 0 1 0 0 Single-Shot 2 1 0 0 0 1 0 0 0 0 Continuous 11 0 1 0 0 0 0 0 1 0 Single-Shot 3 1 0 0 0 0 1 0 0 0 Continuous 12 0 1 0 0 0 0 0 0 1 Single-Shot 4 1 0 0 0 0 0 1 0 0 Continuous 13 0 0 1 1 0 0 0 0 0 Single-Shot 5 1 0 0 0 0 0 0 1 0 Continuous 14 0 0 1 0 1 0 00 0 0 Single-Shot 6 1 0 0 0 0 0 0 0 1 Continuous 15 0 0 1 0 0 1 0 0 0 Single-Shot 7 0 1 0 1 0 0 0 0 0 Single-Shot 16 0 0 1 0 0 0 1 0 0 Single-Shot 8 0 1 0 0 1 0 0 0 0 Single-Shot 17 0 0 1 0 0 0 0 1 0 Single-Shot 9 0 1 0 0 0 1 0 0 0 Single-Shot 18 0 0 1 0 0 0 0 0 2 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. CODE T3 (C3) (C2) (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.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 7 - June, 2005 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 PT2249A PT2250A T1 (C1 Code) Diode C1 T2 (C2 Code) C2 C2 T3 (C3 Code) C3 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 48a a 3a Code Bit Continuous/ Single-Shot Code Key Input Code 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 = fosc 1 x 192

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 8 - June, 2005 Infrared Remote Control Transmitter PT2248 DISTINCTION OD BIT “1” AND “0” a 3a a3a Bit " 0" Bit " 1" 01 01 1 0 01 0 0 01 One word of the transmission command is in the configuration of (010110010001). SINGLE-SHOT SIGNAL 60a 48a 80a 48a PT2248 Key On /TXOUT Command Code Duplicate of Command Code

2 Command Words

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.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 9 - June, 2005 Infrared Remote Control Transmitter PT2248 CONTINUOUS SIGNAL 48a 80a PT2248 Key On /TXOUT 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: 80a48a PT2248 Key On /TXOUT 48a 208a 48a 48a 48a 48a 80a 80a

2 Command Words Pause 2 Command Words

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 = ( H z ) where: fc = 38KHz at fosc = 455KHz Transmitting Signal Pulse Modulated Transmitting Signal

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 10 - June, 2005 Infrared Remote Control Transmitter PT2248 ABSOLUTE MAXIMUM RATINGS (Ta=25℃) Parameter Symbol Ratings Unit Supply Voltage Vcc 5.5 V Input/Output Voltage VIN Vss-0.5 to Vcc+0.5 V Power Dissipation Pd 200 mV Operating Temperature Topr -40 ~ +85 ℃ Storage Temperature Tstg -65~+150 ℃ Txout Output Current Iout -5 mA

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, Vcc=3V, Ta=25℃) Parameter Symbol Conditions Min. Typ. Max. Unit Operating Supply Voltage Vcc All Function Operations 2.2 - 5.0 V Operating Supply Voltage Icc Key On Without Load - - 1.0 mA Stand-by Current ISTB All Keys Off, Stops oscillation - 1.0 10 µA K1~K6 Voltage “H” Level VIH - 0.8Vcc - Vcc V CODE “L” Level VIL - 0 - 0.5 V “H” Level IIH VI=3.0V 20 40 60 µA Input K1~K6 Current “L” Level IIL VI=0V -1.0 - 1.0 µA “H” Level IOH Vo=2.0V -500 - - µA T1~T3 Current “L” Level IOL Vo=2.0V 30 - - µA “H” Level IOH Vo=2.0V -0.1 - - mA Output /TXOUT Current ‘L” Level IOL Vo=2.0V 1.0 - - mA OSC Feedback Resistor Rf - - 500 - KΩ Oscillation Frequency fosc - 400 455 600 KHz

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 11 - June, 2005 Infrared Remote Control Transmitter PT2248 APPLICATION CIRCUIT 455K120p 120p IN4148 2Ω IR LED PNP R 47 fµ - Pin No. 4 ~ 9 Pin No. 10 ~ 12 PT2248 Vcc /TXOUT /TEST CODE Vss XT /XT 127 8 9 10 11 1813 14 15 16 17 61 2 3 4 5 Notes: 1. R = 200Ω to 3.9KΩ 2. It is highly recommended that the 47µf capacitor be situated near the Vcc.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 12 - June, 2005 Infrared Remote Control Transmitter PT2248 ORDER INFORMATION Valid Part Number Package Type Top Code PT2248 16 Pins, DIP, 300mil PT2248 PT2248-S 16 Pins, SOP, 300mil PT2248-S PT2248-SN 16 Pins, SOP, 150mil PT2248-SN

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 13 - June, 2005 Infrared Remote Control Transmitter PT2248

PACKAGE INFORMATION

16 PINS, DIP, 300 MIL

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 14 - June, 2005 Infrared Remote Control Transmitter PT2248 Symbol Min. Nom. Max. A - - 0.210 A1 0.015 - - A2 0.115 0.130 0.195 b 0.014 0.018 0.022 b1 0.014 0.018 0.020 b2 0.045 0.060 0.070 b3 0.030 0.039 0.045 c 0.008 0.010 0.014 c1 0.008 0.010 0.011 D 0.780 0.790 0.800 D1 0.005 - - E 0.300 0.310 0.325 E1 0.240 0.250 0.280 e 0.100 BSC. eA 0.300 BSC. eB - - 0.430 eC 0.000 - 0.060 L 0.115 0.130 0.150 Notes: 1. All dimensions are in INCHES. 2. Dimensioning and toleranc ing 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 c onstrained 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 ar e 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.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 15 - June, 2005 Infrared Remote Control Transmitter PT2248

16 PINS, SOP, 300 MIL

Symbol Min. Max A 2.35 2.65 A1 0.10 0.30 B 0.33 0.51 C 0.23 0.32 D 10.10 10.50 E 7.40 7.60 e 1.27 BSC. H 10.00 10.65 h 0.25 0.75 L 0.40 1.27 α 0 o 8 o

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 16 - June, 2005 Infrared Remote Control Transmitter PT2248 Notes: 1. Dimensioning and toleranc ing per ANSI Y14.5M-1982. 2. Dimension “D” does not include mold flash, prot rusions 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.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 17 - June, 2005 Infrared Remote Control Transmitter PT2248

16 PINS, SOP, 150MIL

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 18 - June, 2005 Infrared Remote Control Transmitter PT2248

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2248 V2.7 - 19 - June, 2005 Infrared Remote Control Transmitter PT2248 Symbol Min. Typ. Max. A 1.35 - 1.75 A1 0.10 - 0.25 A2 1.25 - 1.65 b 0.31 - 0.51 b1 0.28 - 0.48 c 0.17 - 0.25 c1 0.17 - 0.23 D 9.90 BSC. E 6.00 BSC. E1 3.90 BSC. e 1.27 BSC. L 0.40 - 1.27 L1 1.04 REF. L2 0.25 BSC. R 0.07 - - R1 0.07 - h 0.25 - 0.50 θ 0° - 8° θ1 5° - 15° θ2 0° - - Notes: 1. Dimensioning and toleranc ing per ANSI Y 14.5M-1994 2. Controlling Dimension: MILLIMETERS. 3. Dimension D does not include mold flash protrusi ons 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 prot rusion. 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 pr esent, 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.