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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 for extremely high precision and ultra low power applications.

PCF2131 features.

- Selectable I2C bus or SPI bus interface for full flexibility in selecting the relevant MCU/MPU

- Battery backup input and switching circuitry allowing the RTC to track time even when the mains power supply is disconnected

- Calendar function to track time from year to 1/100th of a second

- Up to 4 timestamp registers that can be associated with timestamp inputs to register tamper events

- Up to 2 interrupt outputs to enable/disable the system and reduce total current consumption

Features

Operating temperature range: -40°C to +85°C

Temperature compensated crystal oscillator (TCXO) with trimmer integrated capacitor

Ultra-low supply current: 64nA (typical at VDD=3.3V)

Temperature compensated RTC with typical accuracy of ±3ppm (-40°C to +85°C)

Integrated 32.768kHz quartz crystal and oscillator in the same package

Provides year, month, day, week, hour, minute, second and 1/100th of a second

Leap year correction available

Timestamp function

Features interrupt function

Detects four different events on four input pins (e.g. for tamper detection)

2-wire bi-directional 400kHz fast mode I2C bus interface

4-wire SPI bus with independent data inputs and outputs (max. speed 6.5Mb/s)

Battery backup input pins and switching circuitry

Battery-supported output voltage

Low battery 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 function

Programmable alarm function with interrupt function

Programmable square wave output

Clock operating voltage: 1.2V to 5.5V

Applications

Electronic metering of electricity, water and gas supplies

Precision timekeeping

Access to the exact time of day

GPS devices to reduce first fix time

Applications requiring precise process timing

Products with long automatic unattended running times

• 1.Is the inventory and price seen on the platform accurate?

  A: all online goods on the shelves can be ordered online, but considering the large liquidity of spot inventory, it is not possible to achieve 100% accuracy at present. In case of any abnormality, you can contact our company online and give the corresponding solution.

• 2.Are all our products genuine?

  A: our self-supporting products are from cooperative domestic and foreign original factories or authorized agents, and the source can be traced to ensure the original and authentic products.

• 3.Can you provide the qualification certificate of the original factory or agent?

  A: at present, our self-employed brands TI，ST，ADI，NXP，LATTICE，CYPRESS，INFINEON，XILINX and other first-line brands. Other channels are the original factory and agency channels. If necessary, we can communicate and confirm according to the specific brand and model.

• 4.Can I make an inquiry through the company's website?

  A: You can inquire through the website, or by phone and email.

• 5.When can I deliver the goods after placing an order? How long will it take to get there?

  A: the delivery date is marked in most commodity information. You can estimate the delivery time of the commodity according to the delivery date. The specific arrival time depends on the warehouse where the commodity is located and the logistics mode you choose.

• 6.Can the company issue an invoice?

  A: you can issue ordinary invoices for individual users or special VAT invoices for enterprise users.