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PCF2127AT/1 Datasheet(PDF) 1 Page - NXP Semiconductors |
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PCF2127AT/1 Datasheet(HTML) 1 Page - NXP Semiconductors |
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1 / 80 page  1. General description The PCF2127A is a CMOS1 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 PCF2127A 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. 2. Features and benefits Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors Typical accuracy: ±3ppm from −15 °C to +60 °C Integration of a 32.768 kHz quartz crystal and oscillator in the same package Provides year, month, day, weekday, hours, minutes, and seconds 512 bytes of general purpose static RAM Timestamp function with interrupt capability detection of two different events on one multilevel input pin (e.g. for tamper detection) Two line bidirectional 400 kHz Fast-mode I2C-bus interface (IOL = 3 mA at pin SDA/CE) 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 pin 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 and system reset pin (open-drain) Programmable 1 second or 1 minute interrupt Programmable countdown timer with interrupt capability Programmable watchdog timer with interrupt and reset capability Programmable alarm function with interrupt capability Programmable square wave open-drain output pin Clock operating voltage: 1.2 V to 4.2 V Low supply current: typical 0.65 μA at V DD = 3.0 V and Tamb =25 °C PCF2127A Integrated RTC, TCXO and quartz crystal Rev. 02 — 7 May 2010 Product data sheet 1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17. |
Similar Part No. - PCF2127AT/1 |
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Similar Description - PCF2127AT/1 |
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