Overview
The PCF2127AT/1,518 is a highly accurate Real Time Clock (RTC) and calendar module produced by NXP USA Inc. This CMOS-based device is designed for industrial applications, offering high precision timekeeping and various advanced features. It integrates a Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal, ensuring very high accuracy and low power consumption. The PCF2127AT is part of NXP's family of real-time clocks, known for their reliability and robust performance in diverse environmental conditions.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 20-SOIC (0.295", 7.50mm Width) |
| Operating Temperature Range | -40°C to +85°C |
| Supply Voltage | 1.8 V to 4.2 V |
| Interface | Selectable I²C-bus (400 kHz Fast-mode) or SPI-bus (6.5 Mbit/s) |
| Memory Size | 512 bytes of general-purpose static RAM |
| Time Format | HH:MM:SS (12/24 hr), YY-MM-DD-dd |
| Typical Accuracy | ±3 ppm from -15°C to +60°C (PCF2127AT) |
| Backup Battery Input | Yes, with switch-over circuitry and battery low detection |
| Power Consumption (Timekeeping) | 1.5 µA @ 3.3 V |
Key Features
- Integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) with integrated capacitors
- High accuracy timekeeping: ±3 ppm from -15°C to +60°C for PCF2127AT
- 512 bytes of general-purpose static RAM
- Timestamp function with interrupt capability and detection of two different events on one multilevel input pin
- Selectable I²C-bus or SPI-bus interface
- Battery backup input pin and switch-over circuitry
- Battery low detection function and extra power fail detection function
- Power-On Reset Override (PORO) and oscillator stop detection function
- Interrupt output (open-drain)
- Leap year correction and square wave output
- Programmable watchdog function
Applications
The PCF2127AT/1,518 is suitable for a wide range of industrial applications where accurate timekeeping is crucial. These include:
- Industrial control systems
- Automated systems requiring precise timing
- Data loggers and monitoring equipment
- Medical devices and diagnostic equipment
- Aerospace and automotive systems
Q & A
- What is the PCF2127AT/1,518?
The PCF2127AT/1,518 is a CMOS Real Time Clock (RTC) and calendar module with integrated TCXO and 32.768 kHz quartz crystal, produced by NXP USA Inc.
- What are the key features of the PCF2127AT/1,518?
Key features include high accuracy timekeeping, 512 bytes of SRAM, selectable I²C or SPI interface, battery backup, and various power management functions.
- What is the operating temperature range of the PCF2127AT/1,518?
The operating temperature range is from -40°C to +85°C.
- What interfaces does the PCF2127AT/1,518 support?
The device supports both I²C-bus (400 kHz Fast-mode) and SPI-bus (6.5 Mbit/s) interfaces.
- Does the PCF2127AT/1,518 have battery backup capabilities?
Yes, it has a battery backup input pin and switch-over circuitry, along with battery low detection.
- What is the typical accuracy of the PCF2127AT/1,518?
The typical accuracy is ±3 ppm from -15°C to +60°C for the PCF2127AT model.
- What power management functions are available on the PCF2127AT/1,518?
The device includes battery switch-over, battery low detection, and extra power fail detection functions.
- Is the PCF2127AT/1,518 suitable for industrial applications?
Yes, it is designed for industrial applications requiring high accuracy and reliability.
- What is the memory size of the PCF2127AT/1,518?
The device has 512 bytes of general-purpose static RAM.
- Does the PCF2127AT/1,518 support leap year correction?
Yes, it supports leap year correction and provides a square wave output.
