关键词： 实时时钟芯片

品牌：NXP

型号：PCF2127AT/2 

封装：SOP-20

1. General description The PCF2127 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 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. For a selection of NXP Real-Time Clocks, see Table 94 on page 89 2. Features and benefits ? 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)