These new devices core specification contains 4k words of Flash program memory, 256 bytes of data memory, 64 bytes of true data EEPROM, 8 levels of stack and so on. The devices also contain rich practical peripheral circuits, such as a 10-bit PTM, 10-bit STM, multi-channel 12-bit A/D converter, high efficiency and low power HIRC, etc.

With regard to special functions, the devices include a 3.3V LDO function with a withstand voltage of up to 42V, a traditional fire protection dual-line bus communication circuit which uses both voltage and current for data reception and transmission, a smoke detector AFE as well as a dual-channel IR transmission driving circuit.

Together with the aforementioned features, the only requirement is to add an IR emitter/detector pair for full smoke detection circuit implementation, thus greatly reducing the number of external components and PCB area size. As for packaging, the devices are supplied in 16-pin NSOP and 20-pin SSOP package types, which are suitable for use in networking type smoke detectors or smoke detector/temperature detector products.