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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
PT2212 V1.1
-1-
May, 2007
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Infrared Remote Control Transmitter
PT2212
BLOCK DIAGRAM
PT2212 V1.1
-2-
May, 2007
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Infrared Remote Control Transmitter
PT2212
PIN CONFIGURATION
PIN DESCRIPTION
Symbol KI0 ~ KI3 DOUT VDD NC OSCO OSCI VSS LMP KO0 ~ KO7 SEL I/O I O O I O O I Description Key Matrix Input Pins Built-in Pull-down Resistance 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 Positive Power Supply No Connection Oscillator Output Pin. Oscillator Input Pin Negative Power Supply Transmission Indication Output Pin. This pin connects the transmission Indicator LED. Key Matrix Output Pins System Code Selection Pin Pin No. 1~4 5 6 7 8 9 10 11 19 ~12 20
PT2212 V1.1
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May, 2007
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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.
PT2212 V1.1
-4-
May, 2007
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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
PT2212 V1.1
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Infrared Remote Control Transmitter DOUBLE KEY TRANSMISSION INHIBITION
PT2212
PT2212 V1.1
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May, 2007
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Infrared Remote Control Transmitter
PT2212
DATA CODE
Key K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12 K13 K14 K15 K16 K17 K18 K19 K20 K21 K22 K23 K24 K25 K26 K27 K28 K29 K30 K31 K32 KI0 * Connection KI1 KI2 KI3 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * KO7 KO6 KO5 KO4 KO3 KO2 KO1 KO KO0 D0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 D1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Data Code D3 D4 D5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 0 D6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 D7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
PT2212 V1.1
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May, 2007
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Infrared Remote Control Transmitter
PT2212
DATA CODE FOR DOUBLE KEY OPERATION
Prior Key K21 K25 Combined Key K22 K23 K24 K26 K27 K28 D0 1 0 1 1 0 1 D1 0 1 1 0 1 1 D2 1 1 1 0 0 0 D3 0 0 0 1 1 1 D4 1 1 1 1 1 1 D5 1 1 1 1 1 1 D6 0 0 0 0 0 0 D7 0 0 0 0 0 0
KEY MATRIX
The following diagram illustrated the PT2212 Key Matrix.
PT2212 V1.1
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May, 2007
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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.
PT2212 V1.1
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May, 2007
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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.
PT2212 V1.1
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May, 2007
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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 KO0 KO1 KO2 KO3 KO4 KO5 KO6 KO7 Following is the system code selection diagram. System Code (S2 S1 S0) 000 001 010 011 100 101 110 111
Notes: 1. S0, S1, S2 = 010 2. System Code = 01010000 (S0 to S7)
PT2212 V1.1
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May, 2007
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Infrared Remote Control Transmitter
PT2212
ABSOLUTE MAXIMUM RATING
(Unless otherwise specified, Ta=25) Parameter Symbol Power supply voltage VDD Input voltage VIN Operating temperature Topr Storage temperature Tstg Rating -0.3 ~ 5.0 VSS-0.3 ~ VDD+0.3 -40 ~ +85 -65 ~ +150 Unit V V
ELECTRICAL CHARACTERISTIC
(Unless otherwise specified, VDD=3.0V, Ta=25) Parameter Symbol Test Condition Operating power supply VDD All Functions VDD=3V Oscillation frequency fosc C=100pF Operating power supply fosc=455KHz IDD current VDD=3V VDD=3V Stand-by current ISB fosc=stop High level input voltage VIH(KI) VDD=3V Low level input voltage VIL(KI) VDD=3V Pull down resistance Ron (KI) VDD=3V IOH VOH=1.5V High level output current (DOUT) VDD=3V VOL=1.5V Low level output current IOL (LMP) VDD=3V Min. 2.0 400 0.7VDD 0 100 -10 5 Typ. 455 300 Max. 4.0 600 1 1 VDD 0.3VDD 500 Unit V KHz mA uA V V K mA mA
PT2212 V1.1
- 12 -
May, 2007
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Infrared Remote Control Transmitter
PT2212
APPLICATION CIRCUIT
PT2212 V1.1
- 13 -
May, 2007
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Infrared Remote Control Transmitter
PT2212
ORDER INFORMATION
Valid Part Number PT2212 Package Type 20 Pins, SOP, 300mil Top Code PT2212
PT2212 V1.1
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May, 2007
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Infrared Remote Control Transmitter
PT2212
PACKAGE INFORMATION
20 PINS, SOP, 300MIL
Symbol A A1 B C D E e H h L
PT2212 V1.1
Min. 2.35 0.10 0.33 0.23 12.60 7.40 10.00 0.25 0.40 0
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Nom. 1.27 bsc. -
Max. 2.65 0.30 0.51 0.32 13.00 7.60 10.65 0.75 1.27 8
May, 2007
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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.
PT2212 V1.1
- 16 -
May, 2007

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