The BT258S-800R,118 part is a low-power, 8-bit CMOS microcontroller from NXP. It is an 8-bit device with a single-cycle architecture that can be implemented with a wide range of peripherals. The peripheral set includes a 10-bit A/D converter, 16k of program memory, 128 byte of RAM, an UART, advanced analogue comparators, and a range of timer/counter modules. It operates at a maximum speed of 8 MHz, and it is capable of powering itself from a voltage range of 2.2V to 3.3V, making it ideal for low-power applications.