PCF2129AT/1,512 NXP Semiconductors, PCF2129AT/1,512 Datasheet

PCF2129AT/1,512

Manufacturer Part Number

PCF2129AT/1,512

Description

IC REAL TIME CLK/CALENDAR 20SOIC

Manufacturer

NXP Semiconductors

Type

Clock/Calendar/Alarmr

Datasheets

1.PCF2129AT1512.pdf (2 pages)

2.PCF2129AT1512.pdf (69 pages)

Specifications of PCF2129AT/1,512

Package / Case

20-SOIC (7.5mm Width)

Date Format

YY-MM-DD-dd

Time Format

HH:MM:SS (12/24 hr)

Interface

I²C, SPI

Voltage - Supply

1.8 V ~ 4.2 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Function

Clock, Alarm, Watchdog, Timestamp

Supply Voltage (max)

4.2 V

Supply Voltage (min)

1.8 V

Maximum Operating Temperature

+ 85 C

Minimum Operating Temperature

- 40 C

Mounting Style

SMD/SMT

Rtc Bus Interface

I2C, SPI

Supply Current

800 uA

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Memory Size

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Other names

568-4960-5
935288599512

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Highly accurate RTCs with embedded

quartz crystal

Equipped with a temperature-compensated crystal oscillator, these RTCs eliminate the need

for a heated quartz or GPS frequency references.

Key features

} Time keeping with accuracy of ±3 ppm typically

} Fully integrated quartz oscillator

} Time-stamp function

} Battery switch-over circuit

} System reset generation

} 512 bytes of RAM (PCF2127)

} Factory calibrated

} Clock operating down to 1.2 V

} Low supply current: 650 nA at 3 V

} 1-MHz Fast-mode Plus I

Key applications

} Very accurate time references

} Accurate switching

} Utility meters

} Industrial applications

} HVAC equipment

} GPS, shorter cold start-up time (TTFF)

} Gaming machines

} Alarm systems

} Token for access control

} Cellular infrastructure

C-bus and 6-MHz SPI interface

NXP high-precision RTCs

with time stamp and

advanced power back-up

PCF2127A, PCF2129A

These highly accurate real-time clock/calendars (known as

aRTCs) integrate a temperature-compensated crystal oscillator

(TCXO) that uses a 32.768-kHz quartz crystal for very high

precision with very low power consumption. Manufactured in a

CMOS process, they support access via the I

bus, and offer special support features like a backup battery

switch-over circuit, a programmable Watchdog timer, a time-

stamp function, and more. The PCF2127A add 512 bytes of

general-purpose SRAM. The rich functionality and low overall

power consumption of these aRTCs let the system use smaller

batteries and let the microcontroller stay in hibernation longer.

The backup battery switch-over circuit ensures a constant supply

of power. In standard mode, the oscillator supply is switched

over to the battery as soon as the supply voltage drops below

the battery voltage. The smart mode is used to keep the aRTC

running while preserving battery back-up time. With a Lithium

battery of up to 4.2 V connected as a back-up source, the aRTC

continues to run even with a VDD as low as 3.3 or 2.5 V. The

battery is only switched on if the VDD drops below 2.2 V. The

uninterrupted voltage is also made available on a device pin and

can be used to buffer external circuitry, including RAM memory.

C-bus or the SPI

Related parts for PCF2129AT/1,512

PCF2129AT/1,512 Summary of contents

Page 1

Highly accurate RTCs with embedded quartz crystal Equipped with a temperature-compensated crystal oscillator, these RTCs eliminate the need for a heated quartz or GPS frequency references. Key features } Time keeping with accuracy of ±3 ppm typically } Fully integrated ...

Page 2

Having an on-chip TCXO eliminates the need for a discrete quartz and improves accuracy, since external quartzes are often subject to strong temperature dependencies and can impact performance. The circuit doesn’t have to be calibrated, either. Every aRTC is calibrated ...

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