PT2212_07 PTC | Alldatasheet

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Technical content

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 1 - May, 2007 Infrared Remote Control Transmitter PT2212

DESCRIPTION

PT2212 is a remote control transmitter utilizing CMOS Technology specially designed for infrared remote control applications. PT2212 can support up to 256 command codes and is functionally compatible with TC9012. Pin assignments and application circuit are optimized for easy PCB Layout and low cost advantage.

FEATURES

  • CMOS technology
  • Low power consumption
  • Least external components
  • Low voltage operation
  • Double key operation
  • Up to 32 function keys provided
  • Up to 8 system codes
  • Up to 256 command codes
  • High efficiency transmission
  • Transmission indication output pin provided

APPLICATIONS

  • Television
  • VCR
  • Video disc
  • CD player
  • AV controller
  • Audio equipment

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 2 - May, 2007 Infrared Remote Control Transmitter PT2212 BLOCK DIAGRAM

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 3 - May, 2007 Infrared Remote Control Transmitter PT2212 PIN CONFIGURATION PIN DESCRIPTION Symbol I/O Description Pin No. KI0 ~ KI3 I Key Matrix Input Pins Built-in Pull-down Resistance 1 ~ 4 DOUT O Remote Output Pin The transmission pulse row modulated with carrier (38KHz duty 1/3) is outputted. Large output current may be obtained for operating infrared LED by means of driving base of NPN-Tr VDD - Positive Power Supply 6 NC - No Connection 7 OSCO O Oscillator Output Pin. 8 OSCI I Oscillator Input Pin 9 VSS - Negative Power Supply 10 LMP O Transmission Indication Output Pin. This pin connects the transmission Indicator LED. 11 KO0 ~ KO7 O Key Matrix Output Pins 19 ~12 SEL I System Code Selection Pin 20

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 4 - May, 2007 Infrared Remote Control Transmitter PT2212 FUNCTION DESCRIPTION TRANSMISSION CODE FORMAT The PT2212 transmission code is composed a leader code, system code, and the data code. There are 8-bit of system code (S0 to S7) and this 8-bit system code is outputted twice. Likewise, there are 8-bit of data code (D0 to D7), and the inversion data code is also transmitted. Please refer to the diagram below for details. The leader code is composed of a 4.5ms “High” and 4.5ms “Low”. The system code and the data code are transmitted via a P.P.M. (Pulse Position Modulation) Method. With the system codes transmitted twice and the data code sent with its inversion code, simultaneously, highly efficient operations can be constructed. The Bit “0” and “1” waveforms are given below: Note: r=Tm, Tm=256/fosc=0.56ms The leader code and the first bit of the inverted system code (S0) are transmitted when the key is continuously pressed, thus reduction of the reception treating time and the power dissipation of the infrared LED is possible. At this point, the leader code become very dominant that the average current flow towards the infrared LED is reduced to 1.8% of the peak value leading to a highly efficient transmission.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 5 - May, 2007 Infrared Remote Control Transmitter PT2212 KEY INPUT OPERATION A Key Input Operation may be considered legal or illegal depending on the key pressed. For key interconnection, please refer to the application circuit diagram in the APPLICATION CIRCUIT SECTION. A pull-down resistor is already connected in the VSS Terminals of the Key Input Pins. A 4x8 Key Matrix which may be constructed by connecting Key Inputs – KI0 to KI3 and Key Scan Outputs – KO0 to KO7. When more than two keys are pressed simultaneously, the transmission is terminated by the multi-depression preventive circuit function. For conditions regarding the double key operation, please refer to the DOUBLE KEY OPERATION SECTION. If a key has been continuously pressed for a period of 36ms, the system code and the data code are read and transmitted once. For ON Chattering prevention, the data reading is NOT performed when the key is pressed during the first 9ms. DOUBLE KEY OPERATION As stated earlier, double key operation is possible for the following key combinations: K21 and K22 K21 and K23 K21 and K24 K25 and K26 K25 and K27 K25 and K28 If other key combinations are pressed other than those stated above, then it is considered illegal because of the PT2212’s multiple depression preventive circuitry. However, it is possible to inhibit this multiple depression preventive circuitry so that a double key operation may be performed, thereby a transmission can occur. This condition is possible if the D5 of the Data Code is set to “1”. Because of the order of priority, a transmission can only be made possible in this mode by pressing K22~K24 (K26~K28) 126ms after pressing K21 (K25). Please refer to the diagrams below. DOUBLE KEY TRANSMISSION TIMING

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 6 - May, 2007 Infrared Remote Control Transmitter PT2212 DOUBLE KEY TRANSMISSION INHIBITION

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 7 - May, 2007 Infrared Remote Control Transmitter PT2212 DATA CODE Connection Data Code Key KI0 KI1 KI2 KI3 KO D0 D1 D2 D3 D4 D5 D6 D7 K1 * 0 0 0 0 0 0 0 0 K2 * 1 0 0 0 0 0 0 0 K3 * 0 1 0 0 0 0 0 0 K4 * KO0 1 1 0 0 0 0 0 0 K5 * 0 0 1 0 0 0 0 0 K6 * 1 0 1 0 0 0 0 0 K7 * 0 1 1 0 0 0 0 0 K8 * KO1 1 1 1 0 0 0 0 0 K9 * 0 0 0 1 0 0 0 0 K10 * 1 0 0 1 0 0 0 0 K11 * 0 1 0 1 0 0 0 0 K12 * KO2 1 1 0 1 0 0 0 0 K13 * 0 0 1 1 0 0 0 0 K14 * 1 0 1 1 0 0 0 0 K15 * 0 1 1 1 0 0 0 0 K16 * KO3 1 1 1 1 0 0 0 0 K17 * 0 0 0 0 1 0 0 0 K18 * 1 0 0 0 1 0 0 0 K19 * 0 1 0 0 1 0 0 0 K20 * KO4 1 1 0 0 1 0 0 0 K21 * 0 0 1 0 1 0 0 0 K22 * 1 0 1 0 1 0 0 0 K23 * 0 1 1 0 1 0 0 0 K24 * KO5 1 1 1 0 1 0 0 0 K25 * 0 0 0 1 1 0 0 0 K26 * 1 0 0 1 1 0 0 0 K27 * 0 1 0 1 1 0 0 0 K28 * KO6 1 1 0 1 1 0 0 0 K29 * 0 0 1 1 1 0 0 0 K30 * 1 0 1 1 1 0 0 0 K31 * 0 1 1 1 1 0 0 0 K32 * KO7 1 1 1 1 1 0 0 0

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 8 - May, 2007 Infrared Remote Control Transmitter PT2212 DATA CODE FOR DOUBLE KEY OPERATION Prior Key Combined Key D0 D1 D2 D3 D4 D5 D6 D7 K22 1 0 1 0 1 1 0 0 K23 0 1 1 0 1 1 0 0 K21 K24 1 1 1 0 1 1 0 0 K26 1 0 0 1 1 1 0 0 K27 0 1 0 1 1 1 0 0 K25 K28 1 1 0 1 1 1 0 0 KEY MATRIX The following diagram illustrated the PT2212 Key Matrix.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 9 - May, 2007 Infrared Remote Control Transmitter PT2212 REMOTE OUTPUT WAVEFORM The transmission signal is outputted after the pulse is modulated with 37.9KHz 1/3 of the 12-divided duty at 455KHz.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 10 - May, 2007 Infrared Remote Control Transmitter PT2212 OSCILLATION An oscillation circuit may be constructed by connecting a ceramic oscillator to the Oscillator Pins, namely: OSCO and OSCI. The oscillation frequency is 455KHz. When operation is in a stand-by mode, the oscillation is also normally stopped, thus, minimizing power consumption. When the key switch is pressed, the oscillation starts and the operation begins. When the key is released, the stand-by mode will again be initiated after the completion of the operation. Please refer to the diagram below. When fosc=455KHz, the oscillation output is divided into 12 parts and the modulation carrier frequency is 37.9 ~ 39.2KHz and 1/3 duty. The 455KHz oscillation is divided into 256 parts and the system fundamental clock is 1.78KHz. The inter-relation between modulation carrier (fc) and the system clock (Tm) with respect to the oscillation frequency (fosc) is given in the equations below. MODULATION CARRIER, fc = (1/12) fosc (Duty: 1/3) SYSTEM CLOCK, Tm= 256/fosc As stated earlier, 455KHz oscillation, the signal is outputted after the pulse is modulated with a 37.9KHz, 1/3 of the duty 12-divided by the carrier generation circuit. Please refer to the carrier waveform diagram below.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 11 - May, 2007 Infrared Remote Control Transmitter PT2212 It is highly recommended that the following notes must be strictly observed in the preparation of the reception software:

  • System Code The 8-bit system code is transmitted twice. Therefore, you must decode both codes to be identical.
  • Data Code The 8-bit data code is transmitted simultaneously with its inversion code. Therefore, you must decode the data code and its inversion code and never fail to check their integrity. SYSTEM CODE LATCH CIRCUIT There are 8 kinds of system code that can be selected by wiring the SEL pin to any one of the output pins-KO0 ~ KO7. The fourth bit of the system code (S3) is set to “1”, S4 to S7 bits are “0”. Please refer to the table and diagram below. KO connected to SEL System Code (S2 S1 S0) KO0 000 KO1 001 KO2 010 KO3 011 KO4 100 KO5 101 KO6 110 KO7 111 Following is the system code selection diagram. Notes: 1. S0, S1, S2 = 010 2. System Code = 01010000 (S0 to S7)

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 12 - May, 2007 Infrared Remote Control Transmitter PT2212 ABSOLUTE MAXIMUM RATING (Unless otherwise specified, Ta=25℃) Parameter Symbol Rating Unit Power supply voltage VDD -0.3 ~ 5.0 V Input voltage VIN VSS-0.3 ~ VDD+0.3 V Operating temperature Topr -40 ~ +85 ℃ Storage temperature Tstg -65 ~ +150 ℃ ELECTRICAL CHARACTERISTIC (Unless otherwise specified, VDD=3.0V, Ta=25℃) Parameter Symbol Test Condition Min. Typ. Max. Unit Operating power supply VDD All Functions 2.0 - 4.0 V Oscillation frequency fosc VDD=3V C=100pF 400 455 600 KHz Operating power supply current IDD fosc=455KHz VDD=3V - - 1 mA Stand-by current ISB VDD=3V fosc=stop - - 1 uA High level input voltage VIH(KI) VDD=3V 0.7VDD - VDD V Low level input voltage VIL(KI) VDD=3V 0 - 0.3VDD V Pull down resistance Ron (KI) VDD=3V 100 300 500 KΩ High level output current IOH (DOUT) VOH=1.5V VDD=3V -10 - - mA Low level output current IOL (LMP) VOL=1.5V VDD=3V 5 - - mA

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 13 - May, 2007 Infrared Remote Control Transmitter PT2212 APPLICATION CIRCUIT

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 14 - May, 2007 Infrared Remote Control Transmitter PT2212 ORDER INFORMATION Valid Part Number Package Type Top Code PT2212 20 Pins, SOP, 300mil PT2212

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 15 - May, 2007 Infrared Remote Control Transmitter PT2212

PACKAGE INFORMATION

20 PINS, SOP, 300MIL

Symbol Min. Nom. Max. A 2.35 - 2.65 A1 0.10 - 0.30 B 0.33 - 0.51 C 0.23 - 0.32 D 12.60 - 13.00 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 ° - 8°

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2212 V1.1 - 16 - May, 2007 Infrared Remote Control Transmitter PT2212 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=20) 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 AC. JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.