Overview
The PCF2129AT/2,518, produced by NXP USA Inc., is a highly accurate CMOS Real Time Clock (RTC) and calendar integrated with a Temperature Compensated Crystal Oscillator (TCXO) and a 32.768 kHz quartz crystal. This component is designed for industrial applications requiring very high accuracy and low power consumption. It features a selectable I2C-bus or SPI-bus interface, making it versatile for various system designs.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Accuracy | ±3 ppm from -15 °C to +60 °C (PCF2129AT), ±3 ppm from -30 °C to +80 °C (PCF2129T) |
| Operating Voltage | 1.8 V to 4.2 V |
| Supply Current | Typical 0.70 μA at VDD = 3.3 V |
| Interface | Selectable 400 kHz Fast-mode I2C-bus or 3-line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/s) |
| Backup Battery | Backup battery input pin and switch-over circuitry |
| Package Type | 20-SOIC (0.295 x 7.50mm Width) |
Key Features
- Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
- 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 and detection of two different events on one multilevel input pin
- Battery backed output voltage and battery low detection function
- Programmable watchdog timer with interrupt, programmable alarm function with interrupt capability, and programmable square output
- Power-On Reset Override (PORO) and oscillator stop detection function
- Interrupt output (open-drain) and programmable 1 second or 1 minute interrupt
Applications
- Electronic metering for electricity, water, and gas
- Precision timekeeping and access to accurate time of the day
- GPS equipment to reduce time to first fix
- Applications that require accurate process timing
- Products with long automated unattended operation time
Q & A
- What is the PCF2129AT/2,518?
The PCF2129AT/2,518 is a CMOS Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal Oscillator (TCXO) and a 32.768 kHz quartz crystal, produced by NXP USA Inc.
- What are the operating temperature ranges for the PCF2129AT and PCF2129T?
The operating temperature range for the PCF2129AT is -15 °C to +60 °C, and for the PCF2129T, it is -30 °C to +80 °C.
- What are the typical accuracy values for the PCF2129AT and PCF2129T?
The typical accuracy for both PCF2129AT and PCF2129T is ±3 ppm within their respective temperature ranges.
- What interfaces does the PCF2129AT support?
The PCF2129AT supports a selectable 400 kHz Fast-mode I2C-bus or a 3-line SPI-bus with separate data input and output.
- Does the PCF2129AT have a backup battery feature?
- What is the typical supply current of the PCF2129AT at 3.3 V?
The typical supply current is 0.70 μA at VDD = 3.3 V.
- What package type is the PCF2129AT available in?
The PCF2129AT is available in a 20-SOIC package.
- What are some of the key applications of the PCF2129AT?
Key applications include electronic metering, precision timekeeping, GPS equipment, and products requiring accurate process timing.
- Does the PCF2129AT have a timestamp function?
- Is the PCF2129AT UL Recognized?
