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NXP Semiconductors Electronic Components Datasheet

PCF2127A Datasheet

TCXO and quartz crystal

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PCF2127A
Integrated RTC, TCXO and quartz crystal
Rev. 02 — 7 May 2010
www.DataSheet4U.com
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.


NXP Semiconductors Electronic Components Datasheet

PCF2127A Datasheet

TCXO and quartz crystal

No Preview Available !

NXP Semiconductors
www.DataSheet4U.com
PCF2127A
Integrated RTC, TCXO and quartz crystal
„ Automatic leap year correction
3. Applications
„ Electronic metering for electricity, water, and gas
„ Timekeeping instruments with high precision
„ GPS equipment to reduce time to first fix
„ Applications that require an accurate process timing
„ Products with long automated unattended operation time
4. Ordering information
Table 1. Ordering information
Type number Package
Name Description
PCF2127AT/1 SO20 plastic small outline package; 20 leads; body width 7.5 mm
Version
SOT163-1
5. Marking
Table 2. Marking codes
Type number
PCF2127AT/1
Marking code
PCF2127AT
PCF2127A_2
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 7 May 2010
© NXP B.V. 2010. All rights reserved.
2 of 80


Part Number PCF2127A
Description TCXO and quartz crystal
Maker NXP Semiconductors
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PCF2127A Datasheet PDF






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