PCA8802CX8/B/1,027

Real Time Clock Overview

The PCA8802CX8/B/1,027 is a CMOS integrated circuit designed for battery-powered applications, typically supplied by button cells or flexible polymer batteries. It incorporates a 32.768 kHz quartz crystal oscillator with two integrated load capacitors optimized for 6 pF specifications. The device generates a 1/32 Hz clock signal to increment a 24-bit binary counter, which can be read or set via a two-wire I2C-bus serial interface. An interrupt output provides wake-up capability for microcontrollers. Typical current consumption is 130 nA.

Real Time Clock Feature Summary

• Integrated 32.768 kHz quartz oscillator with automatic gain control and two built-in load capacitors
• Ultra-low power consumption of typically 130 nA during operation
• 24-bit binary counter with auto-increment every 32 seconds and freeze capability during access
• Two-wire I2C-bus serial interface with push-pull SDA output

Real Time Clock Applications

• One-time password (OTP) function generators
• Ultra low-power time keeper circuits
• Smartcard real-time clock (RTC) modules

Real Time Clock Procurement Notes

Verify the package variant matches the required bump type; the CX8 suffix indicates solder bumps in tape and reel packaging. Confirm that the host system supports point-to-point I2C communication with push-pull SDA lines, as pull-up resistors are not required but the master must also use push-pull outputs. Ensure ESD protection measures are implemented during handling due to sensitivity.

Real Time Clock Selection Notes

Select this component when minimizing static current is critical for battery longevity. The integrated oscillator capacitors simplify design for crystals with 6 pF load capacitance. Verify that the application requires a simple counter-based timing mechanism rather than a full calendar RTC. Ensure the PCB layout accommodates WLCSP8 footprint requirements with uniform landing site sizes to prevent die misalignment.

Real Time Clock Part Context

This part belongs to the PCA8802 family of smartcard RTCs manufactured by NXP Semiconductors. The specific suffix /B/1,027 denotes the ordering configuration for solder bump variants packaged in tape and reel. Other family members include the U and UG variants which utilize gold bumps and different wafer processing options.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical characteristics if considering alternative manufacturers' ultra-low-power oscillator-counter ICs.