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PDF PT2212 Data sheet ( Hoja de datos )
| Número de pieza | PT2212 | |
| Descripción | Infrared Remote Control Transmitter | |
| Fabricantes | Princeton Technology Corp | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PT2212 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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Infrared Remote Control Transmitter
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
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
1 page  
Infrared Remote Control Transmitter
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
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
-5-
May, 2007
5 Page 
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
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
System Code (S2 S1 S0)
000
001
010
011
100
101
110
111
Following is the system code selection diagram.
Notes:
1. S0, S1, S2 = 010
2. System Code = 01010000 (S0 to S7)
PT2212 V1.1
- 11 -
May, 2007
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet PT2212.PDF ] | |
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