NEC UPD6121 6122 DATA SHEET

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DATA SHEET

MOS INTEGRATED CIRCUIT

PD6121, 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 µPD1913C

Note

6102G

• 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)

, and 6120C

Note

, 1943G

Note

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

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

µPD6121G-002, µPD6122G-002 cannot be ordered.

The mark shows revised points.

1994

ORDERING INFORMATION

Part number Package Description

µPD6121G-001 20-pin plastic SOP (375 mil) Standard (Ver I spec.) µPD6121G-002 20-pin plastic SOP (375 mil) Standard (Ver II spec.) µPD6122G-001 24-pin plastic SOP (375 mil) Standard (Ver I spec.) µPD6122G-002 24-pin plastic SOP (375 mil) Standard (Ver II spec.)

PIN CONFIGURATION (Top View)

PD6121, 6122

µPD6121

KI KI KI KI

REM

SEL

OSCO

OSCI

0 1 2 3

1 2

µPD6121G-002

3 4 5 6 7 8 9

20 19

µPD6121G-001

18 17 16 15 14 13 12 11

CCS KI/O KI/O KI/O KI/O KI/O KI/O KI/O KI/O LMP

0 1 2 3 4 5 6 7

KI KI KI KI KI

REM

SEL

3 4 5 6 7

OSCO

1 2 3 4 5 6 7 8

9 10 11 14OSCI

12 13V

PIN IDENTIFICATIONS

CCS : Custom code selection input REM : Remote output KI0 - KI7 : Key input SEL : SEL input

0 - KI/O7 : Key input/output VDD : Power supply pin

KI/O LMP : Lamp output VSS : GND pin OSCI, OSCO: Resonator connection pin

µPD6122

24 23 22

µPD6122G-001

µPD6122G-002

21 20 19 18 17 16 15

CCS KI/O KI/O KI/O KI/O KI/O KI/O KI/O KI/O LMP

0 1 2 3 4 5 6 7

PD6121, 6122

BLOCK DIAGRAM

OSCO OSCI VDD LMP

SEL

CCS

Note µPD6121: KI0 - KI3

µPD6122: KI0 - KI7

Key input circuit

Oscillator

Frequency divider

Timing generator

Note

KI0 – KIn

Output circuit

Controller

Data register

Key input/output circuit

KI/O1KI/O0

KI/O2

REM

KI/O7KI/O6KI/O5KI/O4KI/O3

DIFFERENCES BETWEEN PRODUCTS

Part number Item

Operating voltage VDD = 2.0 to 3.3 V Current consumption 1 µA MAX. (at standby)

Custom codes 65,536 (16-bit setting) Data codes 32 x 2 64 x 2

No. of KI pins 4 8 No. of KI/O pins 8 SEL pin Provided Transmission format NEC transmission format Package 20-pin plastic SOP (375 mil) 24-pin plastic SOP (375 mil)

µPD6121 µPD6122

PD6121, 6122

1. PIN FUNCTIONS

(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 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 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 V

(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.

7 of the data code with this pin, the µPD6121 and µPD6122 can transmit 64 and 128 different

DD or VSS.

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

C0C1C2C3C4C5C6C7C0’C1’C2’C3’C4’C5’C6’C7’

Custom Code Custom Code’ Data Code Data CodeLeader Code

=======

C0C1C2C3C4C5C6C

or or or or or or or

1C2C3C4C5C6C7

D0D1D2D3D4D5D6D7D0D1D2D3D4D5D6D

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).

3. CUSTOM CODE (CUSTOM CODE, CUSTOM CODE’) SETTING

The custom code is set in two different ways depending on whether Ver I or Ver II specifications are employed.

Figure 3-1. Custom Code Setting

PD6121, 6122

Higher 8 bits of custom code Ver I Ver II

Remark The µPD6121-001 has Ver I specifications and is pin-compatible with the µPD1943G, and the µPD6122-

A custom code setting example is shown below.

Fixed by external diode bit C0, C1, C2 ... Fixed by connecting CCS pin and either one of

pins KI/O0 to KI/O7

C3 to C7 ... Fixed by absence or presence of external pull-up

resistor for KI/O6, KI/O7

001 has Ver I specifications and is pin-compatible with the µPD6102G. If used as pin-compatible products, please note the following points.

1 Connect the SEL pin to V 2 Change the capacitance of the capacitor connected to the resonator connection pin (Refer to

9. ELECTRICAL SPECIFICATIONS).

DD.

3.1 Standard versions with Ver I specs. (µPD6121-001, µPD6122-001)

Each of the higher 8 bits of the custom code is set to “1” when a diode is connected between the CCS pin and the corresponding KI/O pin, and is set to “0” when no diode is connected. If a pull-up resistor is connected to the KI/O pin corresponding to one of the lower 8 bits of the custom code’, the bit is first set to “1”. Based on the 1’s information of the lower 8 bits of the custom code’, the corresponding bit of the higher 8 bits of the custom code is then captured and not inverted. The non-inverted value is finally overwritten to the corresponding bit of the lower 8 bits of the custom code’. The inverse occurs when no pull-up resistor is connected. It follows from the above that the custom code can be set in 65,536 different ways depending on whether or not a diode and/or pull-up resistor are present. Please refer to Figure 3-2 Example of Custom Code Setting for Ver I Specifications (

001).

Lower 8 bits of custom code’ Fixed by external pull-up resistor bit Fixed by external pull-up resistor (KI/O0 to

KI/O5) bit

µPD6121-001, 6122-

Figure 3-2. Example of Custom Code Setting for Ver I Specifications (

Configuration example

CCS

µPD6121-001, 6122-001)

KI/O

KI/O1KI/O2KI/O3KI/O4KI/O5KI/O6KI/O

PD6121, 6122

The 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

10001010

0C1C2C3C4C5C6C7

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’

10001000

to C

’

to C7

0’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 C 0: Inversion for C

When the above-described setting is done, the following custom code is output.

Custom code

Higher 8 bits of custom code

Lower 8 bits of custom code’

1111101

’

C1’C2’C3’C4’C5’C6’C7’

C C0 C1 C2 C3 C4 C5 C6 C7

Remark Codes are transmitted from the LSB.

3.2 Standard versions with Ver II specs. (µPD6121-002, 6122-002)

In Ver II, the CCS pin does not have the external diode reading function. The allocation of C

2, C1 and C0 of the higher 8 bits of the custom code is done by connecting the CCS pin

to any one of the KI/O0 to KI/O7 pins, as shown below.

PD6121, 6122

Pin connected to CCS pin

KI/O0 KI/O1 KI/O2 KI/O3 KI/O4 KI/O5 KI/O6 KI/O7

When CCS pin is open, (C

The allocation of C whether a pull-up resistor is provided.

7, C6, C5, C4 and C3 of the higher 8 bits of the custom code is as follows depending on

Pull-up Resistor C7 to C3 of Higher 8 bits of Custom Code

KI/O6 KI/O7 C7 C6 C5 C4 C3 Not Provided Not Provided 0 0 0 0 0 Not Provided Provided 1 0 0 1 1 Provided Not Provided 1 0 0 0 0

2 C1 C0) = (0 0 0)

Provided Provided 1 1 1 0 1

Caution In Ver II, it is not possible to set all custom codes.

Also, new custom codes cannot be ordered for Ver II products; therefore, Ver I products should be used if new custom codes are required.

PD6121, 6122

Figure 3-3. Example of Custom Code Setting for Ver II Specifications (µPD6121-002, 6122-002)

Configuration Example

CCS

KI/O

KI/O1KI/O2KI/O3KI/O4KI/O5KI/O6KI/O

ROM3 selector

Connection of any one line

2, C1 and C0 of the higher 8 bits of the custom code are fixed by connecting the CCS pin to KI/O0 to KI/

: Connected : Not connected

O7. Therefore, in the configuration example, they become 1 0 0 . C

0 C1 C2

C7, C6, C5, C4 and C3 of the higher 8 bits of the custom code are selected and fixed by the pull-up resistor connected to KI/O

6 and KI/O7 in four channels.

Pull-up resistor

KI/O

Disconnected Disconnected

Connected Connected

KI/O

Disconnected

Connected

Disconnected

Connected

In this configuration example, C3 to C7 of the higher 8 bits of the custom code become 1 1 0 1 1 . C3 C4 C5 C6 C7

The inversion/non-inversion of the lower 8 bits of the custom code’ is fixed by the bit of the external pullup resistor of KI/O0 to KI/O5.

Caution C

External setting (Refer to Configuration Example)

Bit for non-inversion of custom code is set

6’ and C7’ are fixed to 0.

Lower 8 bits of custom code’ 101000

0’C1’C2’C3’C4’C5

’

Pull-up resistor bit

, KI/O2)

(KI/O

1: Non-inversion for C 0: Inversion for C0 to C

to C

’

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