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NXP Semiconductors Electronic Components Datasheet

PCF2129 Datasheet

Accurate RTC

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PCF2129
Accurate RTC with integrated quartz crystal for industrial
applications
Rev. 7 — 19 December 2014
Product data sheet
1. General description
The PCF2129 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 PCF2129
has 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 83 on page 75
2. Features and benefits
Operating temperature range from 40 C to +85 C
Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
Typical accuracy:
PCF2129AT: 3 ppm from 15 C to +60 C
PCF2129T: 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
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
Power-On Reset Override (PORO)
Oscillator stop detection function
Interrupt output (open-drain)
Programmable 1 second or 1 minute interrupt
Programmable watchdog timer with interrupt
Programmable alarm function with interrupt capability
Programmable square output
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 20.


NXP Semiconductors Electronic Components Datasheet

PCF2129 Datasheet

Accurate RTC

No Preview Available !

NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
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
PCF2129AT
SO20
PCF2129T
SO16
Description
Version
plastic small outline package; 20 leads; SOT163-1
body width 7.5 mm
plastic small outline package; 16 leads; SOT162-1
body width 7.5 mm
4.1 Ordering options
Table 2. Ordering options
Product type number Orderable part number Sales item
(12NC)
Delivery form
PCF2129AT/2
PCF2129AT/2,518
935295732518 tape and reel, 13 inch, dry pack
PCF2129T/2
PCF2129T/2,518
935297464518 tape and reel, 13 inch, dry pack
5. Marking
IC
revision
2
2
Table 3. Marking codes
Product type number
PCF2129AT/2
PCF2129T/2
Marking code
PCF2129AT
PCF2129T
PCF2129
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 19 December 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
2 of 86


Part Number PCF2129
Description Accurate RTC
Maker NXP
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PCF2129 Datasheet PDF






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