78K0/Lx3 - See it!
User’s Manual
U18759EE2V0UM00
22
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.
3.13 Temperature sensor, U2
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.
3.14 IR receiver module, U4
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.
3.15 Buzzer, BUZ1
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.
3.16 Power LED, LED1
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.
