PCA2129T/Q900/2,51

The PCA2129T/Q900/2,51 is an automotive accurate Real Time Clock with an integrated temperature compensated crystal (Xtal) oscillator (TCXO) and a 32.768kHz quartz crystal optimized for very high accuracy and very low power consumption. This has a selectable I²C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function and a timestamp function.

• Two line bidirectional 400kHz Fast-mode I²C-bus interface
• 3 Line SPI-bus with separate data input and output
• Battery backup input pin and switch-over circuitry
• Battery low detection function
• Power-on reset override
• Oscillator stop detection function