NXP Semiconductors PCF2131-ARD Evaluation Board is the ideal evaluation and demo board for the PCF2131 Nano-Power Highly Accurate Real-Time Clock. The PCF2131 Nano-Power Highly Accurate RTC features an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768kHz quartz crystal. The PCF2131-ARD Evaluation Board includes an Arduino Shield connector for easy integration with Arduino compatible evaluation boards.