The PCA8565A is a CMOS Real-Time Clock (RTC) and calendar optimized for low
power consumption. A programmable clock output, interrupt output, and voltage-low
detector are also provided. All addresses and data are transferred serially via a two-line
bidirectional I2C-bus. Maximum bus speed is 400 kbit/s. The built-in word address register
is incremented automatically after each written or read data byte.