Features and Benefits
- Highly Accurate RTC with Integrated crystal Resonator Completely Manages All Timekeeping Functions
- Complete Clock Calendar Functionality Including Seconds, Minutes, Hours, Day, Date, Month, Year, and Century with Leap-Year Compensation Up to Year 2100
- Low Timekeeping Battery Current of 660nA
- Timekeeping Accuracy ±3.5ppm (±0.302 second/day) from -40°C to 85°C
- Two Time-of-Day Alarms
- Temperature-Compensated Programmable Square-Wave Output
- Register for Aging Trim
- Active-low RST Output/Pushbutton Reset Debounce Input
- Digital Temperature Sensor with ±3°C Accuracy
- +2.3V to +5.5V Supply Voltage
- Simple Serial Interface Connects to Most Microcontrollers
- I2C Interface (400kHz)
- Battery-Backup Input for Continuous Timekeeping
- Low-Power Operation Extends Battery-Backup Runtime
- 3.3V Operation
- Operating Temperature Range: -40°C to 85°C
- 5mm x 5mm, 10-Pin LGA Package
The MAX31328 is a low-cost, extremely accurate, I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the crystal resonator enhances the long-term accuracy of the device and eliminates the external crystal requirement in the system. The MAX31328 is available in a 10-pin LGA package.
The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either 24-hour or 12-hour format with an AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided. Address and data are transferred serially through an I2C bidirectional bus. A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures and automatically switch to the backup supply when necessary. Additionally, the active-low RST pin is monitored as a pushbutton input for generating a microprocessor reset.
- Global Positioning System
- Power Meters
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The MAX31328 shield is a fully assembled and tested PCB to evaluate the MAX31328. The MAX31328 is a low-cost, extremely accurate, I2C real-time clock (RTC) with an integrated temperature compensated crystal oscillator (TCXO) and crystal. The shield operates from a single supply, either from USB or external power supply. The device incorporates a battery input and maintains accurate timekeeping when the main power to the device is interrupted. The integration of the crystal resonator enhances the long-term accuracy of the device and eliminates the external crystal requirement in the system. This device is accessed through an I2C serial interface provided by a MAX32625 PICO board.
The shield provides the hardware and software user interface (GUI) necessary to evaluate the MAX31328. It connects to the PC through a MAX32625 PICO board and a Micro-USB cable.
- Global Positioning System
- Power Meters
Features & Benefits
- Easy Evaluation of the MAX31328
- +2.3V to +5.5V Single-Supply Operation
- Proven PCB Layout
- Fully Assembled and Tested
Documentation & Resources
Tools & Simulations
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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Buy Now Pricing
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.