R2262L01-E2

Real Time Clock Overview

The R2262L01-E2 is a CMOS real-time clock IC featuring a 3-wire serial interface (CE, SCLK, SIO) and battery backup switchover. It operates within a minimum timekeeping voltage of 0.6 V to 5.5 V, with typical current consumption of 0.30 µA at 3 V. The device includes built-in oscillation capacitors, two alarm circuits, periodic interrupts, and a 32 kHz clock output. Packaged in QFN0202-18, it supports BCD time/calendar data, leap year identification up to 2099, and high-precision oscillation adjustment.

Real Time Clock Feature Summary

• Ultra-low power consumption: Typical 0.30 µA at VBAT = 3V
• Built-in backup switchover circuit for secondary batteries or capacitors
• Three-signal serial interface supporting up to 1 MHz clock frequency
• High-precision oscillation adjustment with ±1.5 ppm or ±0.5 ppm correction

Real Time Clock Applications

• Battery-backed real-time clock systems
• Low-power embedded devices requiring precise timekeeping
• Systems utilizing secondary batteries or electric double-layer capacitors for backup

Real Time Clock Procurement Notes

Verify the specific package type (QFN0202-18) and voltage detector settings (-VDET1 typ. 2.7 V) against system requirements. Confirm that the internal power output (VRG) meets the load needs. Ensure compatibility with the 3-wire serial protocol timing constraints during integration.

Real Time Clock Selection Notes

Select this model for applications requiring the QFN0202-18 package. The '01' suffix indicates specific voltage detector thresholds (typ. 2.7 V). Compare with the TSSOP10G variant if surface-mount footprint differs. Verify that the 32 kHz clock output and interrupt pin availability align with the CPU interface design.

Real Time Clock Part Context

Part of the R2262x series from Nisshinbo Micro Devices. The 'L' designation specifies the QFN0202-18 package, distinguishing it from the 'T' series which uses TSSOP10G. Both share identical electrical characteristics and functionality, differing only in physical form factor.

Real Time Clock Replacement Considerations

The R2262T01-E2-F is a direct functional equivalent using a TSSOP10G package instead of QFN0202-18. Pinouts differ significantly; PCB redesign is required for substitution.