Overview
The PCA21125T/Q900/1,1 from NXP USA Inc. is a state-of-the-art integrated circuit designed as a Real-Time Clock (RTC) and calendar. This CMOS device is optimized for low-power consumption and operates over a wide temperature range up to 125°C, making it suitable for various applications, including automotive systems. The PCA21125T/Q900/1,1 uses a Serial Peripheral Interface (SPI-bus) for data transfer, with a maximum data rate of 6.0 Mbit/s. It features alarm and timer functions, along with the capability to generate a wake-up signal on the interrupt pin.
Key Specifications
| Specification | Value |
|---|---|
| Manufacturer | NXP USA Inc. |
| Part Number | PCA21125T/Q900/1,1 |
| Package | 14-TSSOP (0.173", 4.40mm Width) |
| Interface | SPI-bus |
| Supply Voltage | 1.6 V to 5.5 V |
| Operating Temperature | -40°C to 125°C |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Current - Timekeeping (Max) | 30.3 µA @ 2V ~ 5V |
| Mounting Type | Surface Mount |
Key Features
- AEC-Q100 compliant for automotive applications.
- Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal.
- Resolution: seconds to years.
- Low supply current: typical 0.8 µA at T amb = 25°C.
- 4-line SPI-bus with separate, but combinable data input and output.
- Freely programmable timer with interrupt capability.
- Freely programmable alarm function with interrupt capability.
- Integrated oscillator capacitor.
- Internal Power-On Reset (POR).
- Open-drain interrupt pin.
- Leap year compensation and square wave output.
- Watchdog timer.
Applications
- Automotive time keeping.
- Metering applications.
- Any system requiring accurate time and date keeping, especially in harsh environmental conditions.
Q & A
- What is the operating temperature range of the PCA21125T/Q900/1,1?
The PCA21125T/Q900/1,1 operates over a temperature range of -40°C to 125°C.
- What interface does the PCA21125T/Q900/1,1 use for data transfer?
The PCA21125T/Q900/1,1 uses a Serial Peripheral Interface (SPI-bus) for data transfer.
- What are the key features of the PCA21125T/Q900/1,1?
The key features include AEC-Q100 compliance, low power consumption, programmable timer and alarm functions, integrated oscillator capacitor, and more.
- How accurate is the real-time clock in the PCA21125T/Q900/1,1?
The accuracy of the RTC typically depends on the clock source used, such as a crystal oscillator, and can range from a few seconds to a few minutes per month.
- Can the PCA21125T/Q900/1,1 be used to set timers or alarms?
- What is the typical current consumption of the PCA21125T/Q900/1,1 during timekeeping?
The typical current consumption during timekeeping is 0.8 µA at 25°C and up to 30.3 µA at 2V ~ 5V.
- Is the PCA21125T/Q900/1,1 RoHS compliant?
- What is the package type of the PCA21125T/Q900/1,1?
The PCA21125T/Q900/1,1 comes in a 14-TSSOP package with a width of 4.40mm.
- Can the PCA21125T/Q900/1,1 be used in automotive applications?
- What is the maximum data rate of the SPI-bus in the PCA21125T/Q900/1,1?
The maximum data rate of the SPI-bus is 6.0 Mbit/s).
