RV-3129-C3-32.768KHZ-OPTION-B-TA-QA

Real Time Clock Overview

The RV-3129-C3-32.768KHZ-OPTION-B-TA-QA is a hermetically sealed SMT Real-Time Clock Module from Micro Crystal AG, integrating a CMOS circuit with a 32.768 kHz tuning fork crystal in a 3.7 x 2.5 x 0.9 mm ceramic package. It features an I²C interface operating at 400 kHz and provides year, month, weekday, date, hours, minutes, and seconds data. The module operates within a supply voltage range of 1.3 V to 5.5 V, consuming 800 nA typical current at 3 V during timekeeping. Time accuracy for Option B is ±25 ppm across the -40°C to +85°C temperature range. It includes automatic backup switchover, trickle charging, and automotive qualification per AEC-Q200.

Real Time Clock Feature Summary

• Hermetically sealed ceramic package with metal lid connected to VSS (pin #6).
• Time accuracy of ±25 ppm (Option B) from -40°C to +85°C.
• Extended operating temperature range available up to +125°C.
• Includes 2 bytes non-volatile user memory and 8 bytes user RAM.

Real Time Clock Applications

• IoT devices
• Metering systems
• Industrial equipment
• Portable electronics
• Automotive applications

Real Time Clock Procurement Notes

Verify the specific ordering suffixes against the manufacturer's datasheet to ensure correct configuration. The 'TA' suffix indicates a standard temperature range of -40°C to +85°C, while 'TB' denotes extended range up to +125°C. Confirm that 'QA' corresponds to Automotive Grade AEC-Q200 qualification as specified in the product naming convention. Ensure compatibility with IPC/JEDEC J-STD-020C soldering standards for Au flashed pads.

Real Time Clock Selection Notes

Select Option B when a time accuracy of ±25 ppm is sufficient for the application, compared to Option A which offers ±6 ppm. Verify if the standard temperature range (-40°C to +85°C) meets operational requirements or if the TB variant is necessary for higher temperatures. Ensure the system supports the 1.3 V to 5.5 V supply voltage range and utilizes the I²C bus interface. Check for space constraints given the 3.7 x 2.5 x 0.9 mm package dimensions.

Real Time Clock Part Context

This component belongs to the RV-3129-C3 series of Real-Time Clock Modules. The C3 designation refers to the specific 3.7 x 2.5 x 0.9 mm package size. The series integrates a tuning fork crystal with CMOS oscillator circuitry, designed for low power consumption and high reliability in compact electronic designs.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. When evaluating alternatives, verify matching package dimensions, I²C interface compatibility, and similar time accuracy specifications. Ensure any replacement also meets AEC-Q200 requirements if automotive qualification is mandatory.

Real Time Clock FAQ

What is the function of Pin 6?

Pin 6 is VSS (Ground), and the metal lid of the package is internally connected to this pin.

What clock output frequencies are supported?

The module provides clock output frequencies of 32.768 kHz, 1024 Hz, 32 Hz, and 1 Hz via the CLKOUT pin.

How does the module handle power loss?

It features an automatic backup switchover function and a trickle charger, utilizing the VBACKUP pin (Pin 9) for backup supply.