Overview
The PCA2129T/Q900/2, 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 device is optimized for high accuracy and low power consumption, making it suitable for various applications requiring precise timekeeping. Although the PCA2129T is not recommended for new designs, it remains a robust solution for existing implementations, with a recommended replacement being the PCA2131TF for new projects.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SO16: plastic, small outline package; 16 leads; 1.27 mm pitch; 10.2 mm x 7.5 mm x 2.65 mm body |
| Interface | Selectable I²C-bus or SPI-bus |
| Quartz Crystal Frequency | 32.768 kHz |
| Backup Battery Switch-over | Yes |
| Programmable Watchdog Function | Yes |
| Timestamp Function | Yes |
| Operating Voltage | 1.6V to 5.5V |
| Timekeeping Current (Max) | 30.3µA @ 2V ~ 5V |
| Operating Temperature | -40°C to 125°C |
| Mounting Type | Surface Mount |
Key Features
- Integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) for high accuracy
- Selectable I²C-bus or SPI-bus interface
- Backup battery switch-over circuit
- Programmable watchdog function
- Timestamp function
- Low power consumption
- Support for leap year and square wave output
Applications
The PCA2129T is suitable for a variety of applications that require precise timekeeping, including automotive systems, industrial control systems, medical devices, and consumer electronics. Its high accuracy and low power consumption make it particularly useful in battery-powered devices and systems where reliability and precision are critical.
Q & A
- What is the PCA2129T/Q900/2, and what are its key features?
The PCA2129T/Q900/2 is a CMOS Real Time Clock (RTC) and calendar with integrated TCXO and 32.768 kHz quartz crystal, featuring selectable I²C or SPI interface, backup battery switch-over, and a programmable watchdog function. - Why is the PCA2129T not recommended for new designs?
The PCA2129T is not recommended for new designs; instead, the PCA2131TF is suggested as a replacement for new projects. - What is the operating voltage range of the PCA2129T?
The operating voltage range is 1.6V to 5.5V. - What is the maximum timekeeping current of the PCA2129T?
The maximum timekeeping current is 30.3µA @ 2V ~ 5V. - What are the key applications of the PCA2129T?
The PCA2129T is used in automotive systems, industrial control systems, medical devices, and consumer electronics where precise timekeeping is essential. - Does the PCA2129T support leap year and square wave output?
Yes, it supports leap year and square wave output. - What is the operating temperature range of the PCA2129T?
The operating temperature range is -40°C to 125°C. - How accurate is the PCA2129T's real-time clock?
The PCA2129T uses a temperature compensated crystal oscillator (TCXO) for very high accuracy. - Can the PCA2129T be used to set timers or alarms?
Yes, it has built-in alarm functions and a programmable watchdog function. - What package type does the PCA2129T come in?
The PCA2129T comes in a SO16 package.
