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PCF2127 Datasheet

Accurate RTC

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PCF2127
Accurate RTC with integrated quartz crystal for industrial
applications
Rev. 8 — 19 December 2014
Product data sheet
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)
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 21.


NXP Semiconductors Electronic Components Datasheet

PCF2127 Datasheet

Accurate RTC

No Preview Available !

NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
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 A at VDD = 3.3 V
3. Applications
Electronic metering for electricity, water, and gas
Precision timekeeping
Access to accurate time of the day
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
PCF2127AT
SO20
PCF2127T
SO16
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic small outline package; 16 leads;
body width 7.5 mm
Version
SOT163-1
SOT162-1
4.1 Ordering options
Table 2. Ordering options
Product type number Orderable part number Sales item
(12NC)
Delivery form
PCF2127AT/2
PCF2127AT/2Y
935299867518 tape and reel, 13 inch, dry pack
PCF2127T/2
PCF2127T/2Y
935299866518 tape and reel, 13 inch, dry pack
5. Marking
IC
revision
2
2
Table 3. Marking codes
Product type number
PCF2127AT/2
PCF2127T/2
Marking code
PCF2127AT
PCF2127T
PCF2127
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 19 December 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
2 of 100


Part Number PCF2127
Description Accurate RTC
Maker NXP
Total Page 3 Pages
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