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Numéro de référence | PCF2127A | ||
Description | TCXO and quartz crystal | ||
Fabricant | NXP Semiconductors | ||
Logo | |||
1 Page
PCF2127A
Integrated RTC, TCXO and quartz crystal
Rev. 02 — 7 May 2010
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Product data sheet
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: ±3 ppm 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 VDD = 3.0 V and Tamb = 25 °C
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17.
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Pages | Pages 30 | ||
Télécharger | [ PCF2127A ] |
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