Auxiliary

DS1302

Driver for the DS1302, Trickle-Charge Timekeeping Chip, 31 X 8 RAM (Pins).

DS1307

Driver for the DS1307, 64 X 8, Serial I2C Real-Time Clock (TWI).

DS3231

Driver for the DS3231, Extremely Accurate I2C-Integrated RTC/TCXO/Crystal.

PCF8574

Driver for the PCF8574/PCF8574A Remote 8-bit I/O expander for I2C-bus with interrupt.