Accurate RTC with 512 B RAM and Battery Backup | NXP Semiconductors

Accurate RTC with 512 B RAM and Battery Backup | NXP Semiconductors

NXP’s Real-Time Clocks

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PCF2127 devices are "Not Recommended for New Designs", please use the replacement part PCA2131TF

The PCF2127 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 very low power consumption. The PCF2127 has 512 bytes of general-purpose static RAM, a selectable I²C-bus or SPI-bus, a backup battery switch-over circuit, a programmable watchdog function, a timestamp function, and many other features.

データ・シート

アプリケーション・ノート

製品詳細

Features

Key Features

UL Recognized Component
Operating temperature range from -40 °C to +85 °C
Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
Typical accuracy:
- PCF2127AT: ±3 ppm from -15 °C to +60 °C
- PCF2127T: ±3 ppm from -30 °C to +80 °C
Integration of a 32.768 kHz quartz crystal and oscillator in the same package
Provides year, month, day, weekday, hours, minutes, seconds, and leap year correction
512 bytes of general-purpose static RAM
Timestamp function:
- with interrupt capability
- detection of two different events on one multilevel input pin (for example, for tamper detection)
Two line bidirectional 400 kHz Fast-mode I²C-bus interface
3 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
Extra power fail detection function with input and output pins
Power-On Reset Override (PORO)
Oscillator stop detection function
Interrupt output (open-drain)
Programmable 1 second or 1 minute interrupt
Programmable watchdog timer with interrupt
Programmable alarm function with interrupt capability
Programmable square wave output pin
Programmable countdown timer with interrupt
Clock operating voltage: 1.8 V to 4.2 V
Low supply current: typical 0.70 μA at V_DD = 3.3 V

購入/パラメータ

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設計・リソース

完全な内訳を受け取ります。 eCad ファイルで製品のフットプリントなどを確認してください。

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