RX8130CE:B3

Real Time Clock Overview

The RX8130CE:B3 is a real-time clock (RTC) module manufactured by EPSON, designed for precise timekeeping in embedded systems. It integrates a 32.768 kHz crystal unit with factory-calibrated frequency accuracy of ±5 ppm at +25°C. The device operates on an I2C bus interface and supports a wide supply voltage range of 1.25V to 5.5V. Key electrical characteristics include a typical current consumption of 0.5µA at 3V during timing hold mode. It features automatic power source switching between main supply and backup battery, along with a rechargeable lithium battery charging control function. The module is housed in a compact 10-SMD package measuring 3.2x2.5mm.

Real Time Clock Feature Summary

• Integrated 32.768 kHz crystal unit with ±5 ppm initial frequency accuracy
• I2C-Bus interface for digital communication and register access
• Ultra-low power consumption: 0.5µA typical at 3V in backup mode
• Automatic power source switching from VDD to VBAT (1.25V min)
• Built-in rechargeable lithium battery charging control circuit

Real Time Clock Applications

• Laptops and notebooks requiring low standby power consumption
• AI translation devices and portable smart hardware
• IoT edge devices operating in wide temperature environments
• Smart wearable devices such as watches and fitness trackers

Real Time Clock Procurement Notes

Verify the specific suffix B3 against the manufacturer's datasheet to confirm pinout and functional variations. Ensure compatibility with the system's I2C voltage levels, as the device supports 1.25V to 5.5V. Check for required external components for battery backup or charging if not using the internal charge control. Confirm lead times and availability through authorized distributors, as production cycles may vary.

Real Time Clock Selection Notes

Select this component when high precision (±5 ppm) and ultra-low power are critical. It is suitable for space-constrained designs due to its 10-SMD (3.2x2.5mm) footprint. Consider the digital offset register feature for applications requiring temperature compensation without external DTCXO circuits. Ensure the application can support I2C communication and has access to a backup power source for continuous operation during main power loss.

Real Time Clock Part Context

The RX8130CE series belongs to EPSON's line of integrated RTC modules that combine quartz crystals with CMOS logic. This family targets applications needing reliable timekeeping without external oscillators. The :B3 suffix typically denotes a specific packaging or tape-and-reel configuration variant within the standard RX8130CE product line, differing in shipping format rather than core functionality.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. When evaluating alternatives, ensure the replacement offers comparable I2C compatibility, similar power consumption profiles, and integrated crystal stability. Verify that any substitute supports the required voltage ranges and package dimensions for direct board integration.