UPD6122G 查看數據表（PDF） - NEC => Renesas Technology

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UPD6122G

REMOTE CONTROL TRANSMISSION CMOS IC

NEC => Renesas Technology 

µPD6121, 6122

Figure 7-2. Application Circuit for Continuous Command Transmission Mode

1 Continuous command transmission for all keysNote 1

REM output is input to KI0 with diode D.

Ceramic resonator

455 kHz

220 pF

220 pF

100 Ω

Transmission

+

display

47 µF -

82 Ω

OSCO OSCI

VDD

LMP

REM

2.2 kΩ

µPD6121G-001

µPD6121G-002

VSS

CCS KI2 KI0

KI3 KI1 KI/O0 KI/O1 KI/O2 KI/O3 KI/O4 KI/O5 KI/O6 KI/O7

VDD

VDD

12 kΩ

Custom code selection resistor

Diode D

Key matrix

Custom code selection diode

2 Continuous command transmission for key output lines

REM output is input to KI/O with diode D.

Ceramic resonator

455 kHz

220 pF

220 pF

OSCO OSCI

VDD

100 Ω

Transmission

display 47 µF

+

-

LMP

REM

82 Ω

2.2 kΩ

µPD6121G-001

µPD6121G-002

VSS

CCS KI2 KI0

KI3 KI1 KI/O0 KI/O1 KI/O2 KI/O3 KI/O4 KI/O5 KI/O6 KI/O7

VDD

VDD

12 kΩ

Custom code selection resistor

Custom code selection diode

Diode D

Continuous command transmission can be performed for keys whose KI/O output lines have received diode

D inputNote 2.

*

Notes 1. Double-key transmission cannot be performed.

2. If the KI/O5 output line (double-input key) is in the continuous command transmission mode,

double-input key transmission is not performed (D5 does not become 1).

Caution When the voltage drop of the REM output is large, the signal is not transmitted accurately.

Therefore, keep the REM output current within 1 mA.

16

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