D6122G PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 D6122G
기능 UPD6122G
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D6122G 데이터시트, 핀배열, 회로
µPD6121, 6122
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.
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.

D6122G pdf, 반도체, 판매, 대치품
µPD6121, 6122
(1) Key input pins (KI0 to KI7), key input/output pins (KI/O0 to KI/O7)
A pull-down resistor is placed between key input pins and a VSS pin. When several keys are pressed
simultaneously, the transmission of the corresponding signals is inhibited by a multiple-input prevention circuit.
In the case of double-key input, transmission is inhibited if both keys are pressed simultaneously (within 36 ms
interval); if not pressed simultaneously, the priority of transmission is first key, then second key.
When a key is pressed, the custom code and data code reading is initiated, and 36 ms later, output to REM output
is initiated. Thus if the key is pressed during the initial 36 ms, one transmission is performed. If a key is kept
pressed for 108 ms or longer, only leader codes are consecutively transmitted until the key is released.
Keys can be operated intermittently at intervals as short as 126 ms (interval between two on’s), making this an
extremely fast-response system.
(2) Resonator connection pins (OSCI, OSCO)
The oscillator starts operating when it receives a key input. Use a ceramic resonator with a frequency between
400 and 500 kHz.
(3) Power-supply pin
The power supply voltage is supplied by two 3-V batteries. A broad range of operating power supply voltage is
allowed, from 2.0 to 3.3 V. The supply current falls below 1 µA when the oscillator is inactive when no keys are
(4) REM output pin
The REM output pin outputs the transmission code, which consists of the leader code, custom code (16 bits),
and data code (16 bits) (Refer to 2. NEC TRANSMISSION FORMAT (REM OUTPUT)).
(5) SEL input pin
By controlling D7 of the data code with this pin, the µPD6121 and µPD6122 can transmit 64 and 128 different
data codes, respectively. By connecting the SEL pin to VDD or VSS, D7 is set to “0” or “1”, respectively.
This pin has high-impedance input, therefore be sure to connect it either to VDD or VSS.
(6) CCS input pin
By placing a diode between the CCS pin and the KI/O pin, it is possible to set a custom code. When a diode
is connected, the corresponding custom code is “1”, and when not connected, it is “0”.
(7) LMP output pin
The LMP pin outputs a low-level signal while the REM pin outputs a transmission code.


D6122G 전자부품, 판매, 대치품
µPD6121, 6122
www.DataSheet4U.coTmhe higher 8 bits of the custom code are determined by the diode connected to the CCS pin and KI/O pin.
Set custom code
Higher 8 bits of custom code
C0 C1 C2 C3 C4 C5 C6 C7
Set to “1” by diode
The inversion/non-inversion of the lower 8 bits of the custom code’ is determined by the pull-up resistor
connected to the KI/O pin.
Set custom code
Lower 8 bits of custom code’
C0’ C1’ C2’ C3’ C4’ C5’ C6C7
Set to “1” by pull-up resistor,
that is, bit for non-inversion of custom code is set
1: Non-inversion for C0 to C7
0: Inversion for C0 to C7
When the above-described setting is done, the following custom code is output.
Custom code
Higher 8 bits of custom code
C0 C1 C2 C3 C4 C5 C6 C7
Lower 8 bits of custom code’
C0’ C1’ C2’ C3’ C4’ C5’ C6’ C7
C0 C1 C2 C3 C4 C5 C6 C7
Remark Codes are transmitted from the LSB.


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