Overview
The PCF2129AT/2,518 is a highly accurate CMOS Real Time Clock (RTC) and calendar module produced by NXP USA Inc. This component integrates a Temperature Compensated Crystal Oscillator (TCXO) and a 32.768 kHz quartz crystal, ensuring very high accuracy and low power consumption. It is designed for industrial applications requiring precise timekeeping and is available in a 20-pin SOIC package.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 20-pin SOIC (SO20) |
| Operating Temperature Range | -40 °C to +85 °C |
| Accuracy | ±3 ppm from -15 °C to +60 °C (PCF2129AT) |
| Bus Interface | Selectable I2C-bus (400 kHz Fast-mode) or SPI-bus (6.5 Mbit/s) |
| Quartz Crystal Frequency | 32.768 kHz |
| Supply Voltage | 1.8 V to 4.2 V |
| Supply Current | Typical 0.70 μA at VDD = 3.3 V |
| Backup Battery Switch-over | Automatic switch-over to backup battery on power failure |
| Interrupt Output | Open-drain interrupt output |
Key Features
- Integrated Temperature Compensated Crystal Oscillator (TCXO) with capacitors
- High accuracy timekeeping with ±3 ppm from -15 °C to +60 °C
- Selectable I2C-bus or SPI-bus interface
- Backup battery input pin and automatic switch-over circuitry
- Battery low detection function
- Programmable watchdog timer and alarm function with interrupt capability
- Timestamp function with interrupt capability
- Power-On Reset Override (PORO) and oscillator stop detection function
- Low power consumption: typical 0.70 μA at VDD = 3.3 V
Applications
- Electronic metering for electricity, water, and gas
- Precision timekeeping in various industrial applications
- Access to accurate time of the day in automated systems
- GPS equipment to reduce time to first fix
- 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 module with an integrated Temperature Compensated Crystal Oscillator (TCXO) and a 32.768 kHz quartz crystal.
- What is the operating temperature range of the PCF2129AT/2,518?
The operating temperature range is from -40 °C to +85 °C.
- What are the available bus interfaces for the PCF2129AT/2,518?
The component supports both I2C-bus (400 kHz Fast-mode) and SPI-bus (6.5 Mbit/s) interfaces.
- How accurate is the PCF2129AT/2,518?
The accuracy is ±3 ppm from -15 °C to +60 °C for the PCF2129AT model.
- Does the PCF2129AT/2,518 have a backup battery feature?
- What is the typical supply current of the PCF2129AT/2,518?
The typical supply current is 0.70 μA at VDD = 3.3 V.
- What are some of the key features of the PCF2129AT/2,518?
Key features include a programmable watchdog timer, alarm function, timestamp function, and low power consumption.
- In what types of applications is the PCF2129AT/2,518 commonly used?
It is commonly used in electronic metering, precision timekeeping, GPS equipment, and products with long automated unattended operation time.
- Does the PCF2129AT/2,518 have a battery low detection function?
- What is the package type of the PCF2129AT/2,518?
The component is available in a 20-pin SOIC (SO20) package.
