Overview
The PCF2131TFY, produced by NXP USA Inc., is a highly accurate and ultra-low power Real Time Clock (RTC) and calendar integrated circuit. It features a Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal, all within the same package. This device is designed for applications requiring precise timekeeping and low power consumption, making it ideal for various industrial and consumer electronics.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Supply Current | Typical 64 nA at VDD = 3.3 V |
| RTC Accuracy | Typical ±3 ppm from -40 °C to +85 °C |
| Bus Interface | Selectable 400 kHz Fast-mode I2C-bus or 4-line SPI-bus |
| SPI-bus Speed | Maximum 6.5 Mbit/s |
| Clock Operating Voltage | 1.2 V to 5.5 V |
| Backup Battery Input | With switch-over circuitry and battery low detection |
| Interrupt Outputs | Two open-drain interrupt outputs |
| Watchdog Timer | Programmable with interrupt capability |
| Alarm Function | Programmable with interrupt capability |
Key Features
- Temperature Compensated Crystal Oscillator (TCXO) with trimmed integrated capacitors
- Ultra-low power consumption
- Integration of a 32.768 kHz quartz crystal and oscillator in the same package
- Provides year, month, day, weekday, hours, minutes, seconds, and 1/100 seconds
- Leap year correction
- Timestamp function with interrupt capability for four different events
- Battery backup input pin and switch-over circuitry
- Battery low detection function
- Power-On Reset (POR) and Power-On Reset Override (PORO) function
- Software reset function
- Programmable 1 second or 1 minute interrupt
- Programmable square output
Applications
The PCF2131TFY is suitable for a variety of applications, including:
- Electronic metering for electricity, water, and gas
- Industrial control systems
- Consumer electronics requiring precise timekeeping
- Automotive systems
- Medical devices
- Security systems with tamper detection
Q & A
- What is the operating temperature range of the PCF2131TFY?
The operating temperature range is from -40 °C to +85 °C. - What is the typical supply current of the PCF2131TFY at 3.3 V?
The typical supply current is 64 nA at VDD = 3.3 V. - What is the accuracy of the RTC in the PCF2131TFY?
The typical accuracy is ±3 ppm from -40 °C to +85 °C. - What bus interfaces are supported by the PCF2131TFY?
The device supports a selectable 400 kHz Fast-mode I2C-bus or a 4-line SPI-bus. - What is the maximum speed of the SPI-bus in the PCF2131TFY?
The maximum speed of the SPI-bus is 6.5 Mbit/s. - Does the PCF2131TFY have a backup battery feature?
Yes, it has a backup battery input pin with switch-over circuitry and battery low detection. - What is the purpose of the timestamp function in the PCF2131TFY?
The timestamp function saves the actual time in the timestamp registers when a trigger event occurs. - Can the PCF2131TFY be used in automotive systems?
Yes, it can be used in automotive systems due to its robust specifications and features. - Does the PCF2131TFY support leap year correction?
Yes, it supports leap year correction. - How many interrupt outputs does the PCF2131TFY have?
The device has two open-drain interrupt outputs.
