Overview
The PCF2129AT/1,512, 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 very high accuracy and very low power consumption, making it suitable for a variety of industrial applications. It features a selectable I²C-bus or SPI-bus interface, a backup battery switch-over circuit, and several programmable functions such as a watchdog timer, timestamp, and alarm functions.
Key Specifications
| Specification | Value |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Supply Voltage Range | 1.8 V to 4.2 V |
| Typical Accuracy | ±3 ppm from -15 °C to +60 °C (PCF2129AT), ±3 ppm from -30 °C to +80 °C (PCF2129T) |
| Quartz Crystal Frequency | 32.768 kHz |
| Bus Interface | Selectable I²C-bus (400 kHz Fast-mode) or SPI-bus (6.5 Mbit/s) |
| Backup Battery Input | Yes, with automatic switch-over circuitry |
| Power Consumption | Typical 0.70 μA at VDD = 3.3 V |
| Package Type | SO20 |
Key Features
- UL Recognized Component (PCF2129AT and PCF2129T)
- 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 low detection function
- Power-On Reset Override (PORO) and oscillator stop detection function
- Interrupt output (open-drain)
- Programmable 1 second or 1 minute interrupt, watchdog timer, and alarm function with interrupt capability
- 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 PCF2129AT/1,512? The PCF2129AT/1,512 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 are the operating temperature ranges for the PCF2129AT and PCF2129T? The operating temperature range is from -40 °C to +85 °C.
- What are the typical accuracy values for the PCF2129AT and PCF2129T? The typical accuracy is ±3 ppm from -15 °C to +60 °C for PCF2129AT and ±3 ppm from -30 °C to +80 °C for PCF2129T.
- What bus interfaces are available on the PCF2129? The PCF2129 supports both I²C-bus (400 kHz Fast-mode) and SPI-bus (6.5 Mbit/s) interfaces.
- Does the PCF2129 have a backup battery feature? Yes, it has a backup battery input pin and automatic switch-over circuitry.
- What is the power consumption of the PCF2129? The typical power consumption is 0.70 μA at VDD = 3.3 V.
- What package type is the PCF2129 available in? The PCF2129 is available in an SO20 package.
- What are some of the key features of the PCF2129? Key features include a timestamp function, programmable watchdog timer, alarm function, and battery low detection.
- What are some common applications for the PCF2129? Common applications include electronic metering, precision timekeeping, GPS equipment, and products requiring accurate process timing.
- Is the PCF2129 UL recognized? Yes, the PCF2129AT and PCF2129T are UL recognized components.
