DATA
SHEET
DATA
SHEET
µ
PD6121, 6122
REMOTE CONTROL TRANSMISSION CMOS IC
MOS INTEGRATED CIRCUIT
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: V
DD
= 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
µPD1913C
Note
, 1943G
Note
,
6102G
Note
, and 6120C
Note
.
•
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
µ
PD6121G-002,
µ
PD6122G-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.
©
1994
1994
µ
PD6121, 6122
*
ORDERING INFORMATION
Part number
µPD6121G-001
µPD6121G-002
µPD6122G-001
µPD6122G-002
Package
20-pin plastic SOP (375 mil)
20-pin plastic SOP (375 mil)
24-pin plastic SOP (375 mil)
24-pin plastic SOP (375 mil)
Description
Standard (Ver I spec.)
Standard (Ver II spec.)
Standard (Ver I spec.)
Standard (Ver II spec.)
PIN CONFIGURATION (Top View)
µPD6121
KI
0
KI
1
KI
2
KI
3
REM
V
DD
SEL
OSCO
OSCI
V
SS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CCS
KI/O
0
KI/O
1
KI/O
2
KI/O
3
KI/O
4
KI/O
5
KI/O
6
KI/O
7
LMP
KI
2
KI
3
KI
4
KI
5
KI
6
KI
7
REM
V
DD
SEL
OSCO
OSCI
V
SS
1
2
3
4
5
6
7
8
9
10
11
12
µPD6122
24
23
22
21
20
19
18
17
16
15
14
13
KI
1
KI
0
CCS
KI/O
0
KI/O
1
KI/O
2
KI/O
3
KI/O
4
KI/O
5
KI/O
6
KI/O
7
LMP
µPD6121G-001
µPD6121G-002
µPD6122G-001
µPD6122G-002
PIN IDENTIFICATIONS
CCS
KI
0
- KI
7
LMP
:
:
:
Custom code selection input
Key input
Key input/output
Lamp output
Resonator connection pin
REM :
SEL :
V
DD
:
V
SS
:
Remote output
SEL input
Power supply pin
GND pin
KI/O
0
- KI/O
7
:
OSCI, OSCO:
2
µ
PD6121, 6122
BLOCK DIAGRAM
OSCO
OSCI
V
DD
LMP
*
Oscillator
Output circuit
REM
Frequency divider
SEL
Controller
Data register
Timing generator
V
SS
CCS
Key input circuit
Key input/output circuit
KI
0
– KI
n
Note
KI/O
0
KI/O
1
KI/O
2
KI/O
3
KI/O
4
KI/O
5
KI/O
6
KI/O
7
Note
µPD6121:
KI
0
- KI
3
µPD6122:
KI
0
- KI
7
DIFFERENCES BETWEEN PRODUCTS
Part number
Item
Operating voltage
Current consumption
(at standby)
Custom codes
Data codes
No. of KI pins
No. of KI/O pins
SEL pin
Transmission format
Package
32 x 2
4
8
Provided
NEC transmission format
20-pin plastic SOP (375 mil)
24-pin plastic SOP (375 mil)
65,536 (16-bit setting)
64 x 2
8
µPD6121
V
DD
= 2.0 to 3.3 V
1
µA
MAX.
µPD6122
3
µ
PD6121, 6122
1.
PIN FUNCTIONS
(1) Key input pins (KI
0
to KI
7
), key input/output pins (KI/O
0
to KI/O
7
)
A pull-down resistor is placed between key input pins and a V
SS
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
pressed.
(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 D
7
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 V
DD
or V
SS
, D
7
is set to “0” or “1”, respectively.
This pin has high-impedance input, therefore be sure to connect it either to V
DD
or V
SS
.
(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.
4
µ
PD6121, 6122
2.
NEC 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
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
or or or or or or or or
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
Leader Code
Custom Code
=
=
=
=
=
=
=
=
Custom Code’
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
0
’ C
1
’ C
2
’ C
3
’ C
4
’ C
5
’ C
6
’ C
7
’ D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
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
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