PCF2131 Nano-power highly accurate RTC with integrated quartz crystal Rev. 1.1 15 October 2021 Product data sheet 1 General description The PCF2131 is a CMOS Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very high accuracy and ultra low power consumption. The 2 PCF2131 has a selectable I C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, four timestamps function, and many other features. For a selection of NXP Real-Time Clocks, see Section 15.1. 2 Features and benefits Operating temperature range from -40 C to +85 C Temperature Compensated Crystal Oscillator (TCXO) with trimmed integrated capacitors Ultra low supply current: typical 64 nA at V = 3.3 V DD Temperature compensated RTC, typical accuracy 3 ppm from -40 C to +85 C Integration of a 32.768 kHz quartz crystal and oscillator in the same package Provides year, month, day, weekday, hours, minutes, seconds and 1/100 seconds Provides leap year correction Timestamp function with interrupt capability detection of four different events on four input pins (for example, for tamper detection) 2 2-line bidirectional 400 kHz Fast-mode I C-bus interface 4-line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/s) Battery backup input pin and switch-over circuitry Battery backed output voltage Battery low detection function Power-On Reset (POR) Power-On Reset Override (PORO) function Software reset function Two interrupt outputs (open-drain) Programmable 1 second or 1 minute interrupt Programmable watchdog timer with interrupt Programmable alarm function with interrupt capability Programmable square output Clock operating voltage: 1.2 V to 5.5 VNXP Semiconductors PCF2131 Nano-power highly accurate RTC with integrated quartz crystal 3 Applications Electronic metering for electricity, water, and gas Precision timekeeping Access to accurate time of the day GPS equipment to reduce time to first fix Applications that require an accurate process timing Products with long automated unattended operation time 4 Ordering information Table 1.Ordering information Type number Topside Package marking Name Description Version PCF2131TF F31 HLSON16 thermal enhanced low profile small outline no leads, 16 SOT1992-1 terminals, 0.125 dimple wettable flank, 0.5 mm pitch, 4.5 mm x 3.5 mm x 1.45 mm body 4.1 Ordering options Table 2.Ordering options Product type Orderable part Package Packing method Minimum Temperature number number Order Quantity PCF2131TF PCF2131TFY HLSON16 REEL 13 Q1 DP 4000 T = -40 C to +85 C amb PCF2131 All information provided in this document is subject to legal disclaimers. NXP B.V. 2021. All rights reserved. Product data sheet Rev. 1.1 15 October 2021 2 / 86