ISL12029IBZ

Real Time Clock Overview

The ISL12029IBZ is a low-power Real Time Clock/Calendar IC manufactured by Renesas Electronics Corporation. It features an I²C interface with a 400kHz data transfer rate and integrates 512x8-bit EEPROM configured in 16-byte pages. The device tracks time using separate registers for hours, minutes, and seconds, alongside calendar registers for date, month, year, and day of the week, accurate through 2099 with automatic leap year correction. It operates on a main supply voltage (VDD) of 2.7V to 5.5V and a backup supply (VBAT) of 1.8V to 5.5V. Key electrical parameters include a battery supply current of 800nA at 1.8V VBAT and a typical timekeeping current of 10µA to 20µA depending on VDD.

Real Time Clock Feature Summary

• Integrated 512x8-bit EEPROM with BlockLock™ protection and >2,000,000 cycle endurance.
• Two non-volatile alarms settable to second, minute, hour, day, or month with periodic interrupt mode.
• On-chip oscillator compensation with 64-position digitally controlled trim capacitor and 6 frequency adjustment settings.
• CPU Supervisor functions including Power-On Reset, Low Voltage Sense, and Watchdog Timer.

Real Time Clock Applications

• Utility Meters
• HVAC Equipment
• Network Routers, Hubs, Switches, Bridges

Real Time Clock Procurement Notes

Verify the specific reset voltage threshold required for the application, as the ISL12029IBZ variant has a default VRESET of 4.38V. Confirm package availability, as this component may be subject to limited supply or obsolescence status. Ensure the design accommodates the Legacy Mode power control setting distinct from the ISL12029A series.

Real Time Clock Selection Notes

Select the ISL12029IBZ when a higher VDD trip point (4.38V) is necessary for system supervision. This model uses the Legacy Mode Power Control Setting; if the application requires VBAT > VDD operation, the ISL12029A series must be selected instead. Verify that the 14-lead SOIC package fits the PCB layout constraints.

Real Time Clock Part Context

The ISL12029IBZ belongs to the ISL12029 family of real-time clocks. It shares the same core functionality as other variants but differs in its specific reset voltage threshold and power control mode. It is packaged in a 14-lead Small Outline Integrated Circuit (SOIC) format, distinguishing it from the TSSOP versions available in the same product line.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Designers should verify compatibility with pinout and electrical specifications before considering alternative RTC devices.