PCA2125TS/1,112

Real Time Clock Overview

The PCA2125TS/1,112 is a CMOS real-time clock and calendar optimized for low-power consumption. It operates within a voltage range of 1.3 V to 5.5 V and supports an operating temperature up to 125 °C. Data transfer occurs via a Serial Peripheral Interface (SPI) bus with a maximum data rate of 6.0 Mbit/s. The device provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal. It features a typical backup current of 0.55 μA at VDD = 3.0 V and Tamb = 25 °C. The component is AEC Q100 qualified for automotive applications.

Real Time Clock Feature Summary

• Provides timekeeping resolution from seconds to years using a 32.768 kHz quartz crystal.
• Features a 3-line SPI-bus with separate combinable data input and output, supporting rates up to 6.0 Mbit/s.
• Includes integrated oscillator capacitor and internal power-on reset circuitry.
• Supports freely programmable timer and alarm functions with interrupt capabilities.

Real Time Clock Applications

• Automotive time keeping application
• Metering

Real Time Clock Procurement Notes

Verify the specific ordering suffix /1,112 against manufacturer documentation to confirm packaging details. Confirm availability status as distribution listings may indicate discontinued or limited stock conditions. Ensure compatibility with system voltage requirements ranging from 1.3 V to 5.5 V before procurement.

Real Time Clock Selection Notes

Select this component for applications requiring low-power RTC functionality with SPI interface. Ensure the design accommodates the TSSOP14 package dimensions. Verify that the system can handle the 32.768 kHz external crystal requirement. Check if AEC Q100 qualification is necessary for the target environment.

Real Time Clock Part Context

The PCA2125 is part of NXP Semiconductors' real-time clock family. The TS/1,112 designation indicates the TSSOP14 plastic thin shrink small outline package variant. This specific model is designed for high-temperature operation and automotive reliability standards.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consult NXP Semiconductors for direct replacements or cross-reference options based on pinout and electrical specifications.

Real Time Clock FAQ

What is the maximum data rate for the SPI interface?

The maximum data rate for the Serial Peripheral Interface (SPI) bus is 6.0 Mbit/s.

How is the alarm flag cleared?

The alarm flag bit AF must be cleared by software writing a logic 0 to the corresponding bit in the Control_2 register.

What is the typical backup current consumption?

The typical backup current is 0.55 μA when VDD is 3.0 V and the ambient temperature is 25 °C.