AVR ATMega8 development board using PLL MC145170

AVR ATMega8 board using PLL MC145170

This board allows management of an FM transmitter that includes a phase-locked loop (PLL) connected via a serial bus (SPI) such as the MC145170.

The current frequency is stored in the EEPROM so that the PLL can be configured upon power-on.

Three auxiliary frequencies can be used for maintenance functions and/or high-frequency adjustments.

The local interface includes four buttons and an LCD display for modifying transmitter parameters.

The board can be driven entirely via a serial link RS232 (19200 baud, 8 data bits, 2 stop bits, no parity).

A temperature sensor is used to control the operating temperature, and two analog inputs are used for high-frequency power measurement (forward and reflected).

Information regarding TOS protection activation is processed by this board to notify users (local and remote) of TOS alarms.