Overview
The PCF2129T/2,518, produced by NXP USA Inc., is a CMOS Real Time Clock (RTC) and calendar integrated with a Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal. This component is designed for high accuracy and low power consumption, making it suitable for industrial applications. It features a selectable I2C-bus or SPI-bus interface, a backup battery switch-over circuit, and various programmable functions such as a watchdog timer, timestamp, and alarm functions.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Accuracy | ±3 ppm from -30 °C to +80 °C (PCF2129T) |
| Frequency | 32.768 kHz quartz crystal |
| Interface | Selectable 400 kHz Fast-mode I2C-bus or 3-line SPI-bus (maximum speed 6.5 Mbit/s) |
| Power Supply | 1.8 V to 4.2 V |
| Supply Current | Typical 0.70 μA at VDD = 3.3 V |
| Package Type | SO16 plastic small outline package; 16 leads; body width 7.5 mm (SOT162-1) |
| Backup Battery | Backup battery input pin and switch-over circuitry |
| Interrupts | Programmable 1 second or 1 minute interrupt, programmable watchdog timer with interrupt, programmable alarm function with interrupt capability |
Key Features
- UL Recognized Component
- 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 backup input pin and switch-over circuitry, battery backed output voltage, and battery low detection function
- Power-On Reset Override (PORO) and oscillator stop detection function
- Interrupt output (open-drain) and programmable square output
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 accurate process timing
- Products with long automated unattended operation time
Q & A
- What is the PCF2129T/2,518? The PCF2129T/2,518 is a CMOS Real Time Clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal.
- What is the operating temperature range of the PCF2129T/2,518? The operating temperature range is from -40 °C to +85 °C.
- What is the accuracy of the PCF2129T/2,518? The typical accuracy is ±3 ppm from -30 °C to +80 °C.
- What interfaces does the PCF2129T/2,518 support? It supports a selectable 400 kHz Fast-mode I2C-bus or a 3-line SPI-bus with a maximum speed of 6.5 Mbit/s.
- What is the power supply range for the PCF2129T/2,518? The power supply range is from 1.8 V to 4.2 V.
- Does the PCF2129T/2,518 have a backup battery feature? Yes, it has a backup battery input pin and switch-over circuitry.
- What are some of the programmable functions available on the PCF2129T/2,518? It includes programmable 1 second or 1 minute interrupt, programmable watchdog timer with interrupt, and programmable alarm function with interrupt capability.
- What are some common applications for the PCF2129T/2,518? Common applications include electronic metering, precision timekeeping, GPS equipment, and products requiring accurate process timing.
- How does the PCF2129T/2,518 handle power failures? It has a backup battery switch-over circuit that automatically switches to the backup battery when a power failure is detected.
- Is the PCF2129T/2,518 UL recognized? Yes, the PCF2129T is a UL recognized component.
