External Lcd Resistors, Rr1 - Rr5; Temperature Sensor, U2; Ir Receiver Module, U4; Buzzer, Buz1 - NEC 78K0/L 3 - See it! Series User Manual

Demonstration kit for the 78k0 l series

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78K0/Lx3 - See it!

3.12 External LCD resistors, RR1 – RR5

The 78K0/Lx3 - See it! board can also be configured to use external voltage divider resistors for the

generation of the LCD drive power supplies. For more details on the external resistance division method

please refer to the user's manual of the 78K0/LF3 device.

For temperature measurement and primarily as an application example the 78K0/Lx3 - See it! board is

equipped within an temperature sensor IC (type S-8120C). The output pin of the temperature sensor is

connected to pin P21/ANI1/DS0+ of the 78K0/LF3 device.

For remote control application an IR receiver module is equipped on the 78K0/Lx3 - See it! board. The

output terminal of the IR receiver (type RPM7138) is connected to the remote control input pin

P41/KR1/RIN of the 78K0/LF3 device.

To generate acoustic signals and sound waves a buzzer is connected to the timer output port of the 16-

Bit Timer/Event Counter 00, equal to port P34/TI52/TI010/TO00/RTC1HZ/INTP1 of the 78K0/LF3 device.

The AC buzzer operates in a voltage range of 2V...5V.

LED1 is the power LED of the 78K0/Lx3 – See it! board. It indicates if power is applied to the 78K0/Lx3 –

See it! board.

User's Manual U18759EE2V0UM00

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