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PDF D6122G Data sheet ( Hoja de datos )
| Número de pieza | D6122G | |
| Descripción | UPD6122G | |
| Fabricantes | NEC | |
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DDAATTAA SSHHEEETET
MOS INTEGRATED CIRCUIT
µPD6121, 6122
REMOTE CONTROL TRANSMISSION CMOS IC
The µPD6121, 6122 are infrared remote control transmission ICs using the NEC transmission format that are ideally
suited for TVs, VCRs, audio equipment, air conditioners, etc. By combining external diodes and resistors, a maximum
of 65,536 custom codes can be specified. These ICs come in small packages, thus facilitating the design of light
and compact remote control transmitters.
The NEC transmission format consists of leader codes, custom codes (16 bits), and data codes (16 bits). It can
be used for various systems through decoding by a microcontroller.
*
FEATURES
• Low-voltage operation: VDD = 2.0 to 3.3 V
• Low current dissipation: 1 µA Max. (at standby)
• Custom codes: 65,536 (set by external diodes and resistors)
• Data codes:
• µPD6121: 32 codes (single input), 3 codes (double input), expandable up to 64 codes through SEL pin
• µPD6122: 64 codes (single input), 3 codes (double input), expandable up to 128 codes through SEL pin
• µPD6121, 6122 are transmission code-compatible (NEC transmission format) with the µPD1913CNote, 1943GNote,
6102GNote, and 6120CNote.
• Pin compatibility:
• µPD6121G-001 is pin-compatible with the µPD1943G (However, capacitance of capacitor connected to
oscillator pin and other parameters vary)
• µPD6122G-001 is pin-compatible with the µPD6102G (However, capacitance of capacitor connected to
oscillator pin and other parameters vary)
• Standard products (Ver. I, Ver. II specifications)
Note Provided for maintenance purpose only
*
*
• When using this product (in NEC transmission format), please order custom codes from NEC.
• New custom codes for the µPD6121G-002, µPD6122G-002 cannot be ordered.
The information in this document is subject to change without notice.
Document No. U10114EJ6V0DS00 (6th edition)
(Previous No. IC-1813)
Date Published October 1995 P)
Printed in Japan
*The mark shows revised points.
©
11999944
1 page  
µPD6121, 6122
www.DataSheet42U. .coNmEC TRANSMISSION FORMAT (REM OUTPUT)
The NEC transmission format consists of the transmission of a leader code, 16-bit custom codes (Custom
Code, Custom Code’), and 16-bit data codes (Data Code, Data Code) at one time, as shown in Figure 2-1.
Also refer to 4. REMOTE OUTPUT WAVEFORM.
Data Code is the inverted code of Data Code.
The leader code consists of a 9-ms carrier waveform and a 4.5-ms OFF waveform and is used as leader for
the ensuing code to facilitate reception detection.
Codes use the PPM (Pulse Position Modulation) method, and the signals “1” and “0” are fixed by the interval
between pulses.
Figure 2-1. REM Output Code
C0 C1 C2 C3 C4 C5 C6 C7 C0’ C1’ C2’ C3’ C4’ C5’ C6’ C7’ D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
C0 C1 C2 C3 C4 C5 C6 C7
or or or or or or or or
C0 C1 C2 C3 C4 C5 C6 C7
Leader Code
Custom Code
Custom Code’
Data Code
Data Code
Cautions 1. Use any of the possible 256 kinds of custom codes specified with 00xxH (diode not
connected), as desired. If intending to use custom codes other than 00xxH, please consult
NEC in order to avoid various types of errors from occurring between systems.
2. When receiving data in the NEC transmission format, check that the 32 bits made up of the
16-bit custom code (Custom Code, Custom Code’) and the 16-bit data code (Data Code, Data
Code) are fully decoded, and that there are no signals with the 33rd bit and after (be sure
to check also Data Code).
5
5 Page 
µPD6121, 6122
www.DataSheet44U. .coRmEMOTE OUTPUT WAVEFORM (NEC TRANSMISSION FORMAT:
ONE-SHOT COMMAND TRANSMISSION MODE)
• When fOSC = 455 kHz
(1) Remote (REM) output (from stage 2 , transmission occurs only when key is kept depressed)
REM output
58.5 to 76.5 ms
108 ms
1
(2) Magnification of stage 1
3
REM output
108 ms
2
9 ms 4.5 ms
13.5 ms
Leader Code
Custom Code
8 bits
Custom Code’
8 bits
18 ms to 36 ms
58.5 ms to 76.5 ms
Data Code
8 bits
Data Code
8 bits
27 ms
(3) Magnification of waveform 3
Stop Bit
1 bit
REM output
9 ms
13.5 ms
(4) Magnification of waveform 2
4.5 ms
0.56 ms
1.125 ms 2.25 ms
01
1
00
REM output
9 ms
2.25 ms
11.25 ms
Leader Code
(5) Carrier waveform (Magnification of HIGH period of codes)
0.56 ms
Stop Bit
REM output
8.77 µs
26.3 µs
9 ms or 0.56 ms
Carrier frequency: fc = fosc/12 = 38 kHz
Remark If a key is kept depressed, the second and subsequent times, only the leader code and the stop
bit are transmitted, which allows power savings for the infrared-emitting diode. If a command is
issued continuously in the same way the second and subsequent times as the first time, refer to
7. ONE-SHOT/CONTINUOUS COMMAND TRANSMISSION MODE.
11
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