MAX78615+LMU/A01

Overview

The MAX78615+LMU/A01 is an isolated energy measurement processor (EMP) designed for load monitoring and control in 2-wire single-phase or 3-wire split-phase AC circuits. It integrates a 24-bit processor with field-upgradeable firmware to perform signal processing, compensation, and data formatting. The device supports flexible sensor configurations using up to two MAX78700 isolated data converters or resistive sensors. Key specifications include nonvolatile storage for calibration coefficients, internal or external oscillator timing references, and multiple host interface options including SPI, I2C, and UART.

Feature Summary

• Utilizes embedded algorithms to support highly accurate electricity measurements without requiring large current sensors or optocouplers
• Provides flexible sensor configuration supporting up to two MAX78700 isolated data converters or resistive sensors
• Features nonvolatile flash memory for the persistent storage of input configurations and calibration coefficients
• Offers numerous host interface options including SPI, I2C, and UART with configurable I/O pins for alarm signaling

Applications

• Building automation systems for commercial and industrial use
• Inverters and renewable energy systems
• Level 1 and Level 2 EV charging systems
• Grid-friendly appliances and smart plugs

Procurement Notes

Verify the specific suffix A01 against the official Maxim Integrated datasheet to confirm firmware revision and hardware variant compatibility. Ensure the selected package matches the required PCB footprint, as the device is available in small form factors like the 24-TQFN. Confirm that the development kit, such as MAXREFDES14#, is available if initial system integration testing is required. Cross-reference the RoHS status and environmental compliance details before finalizing procurement orders.

Selection Notes

Select this component when designing isolated metering solutions for single-phase or split-phase AC loads where high accuracy is critical. The integrated firmware reduces host CPU overhead by handling energy accumulation and fault detection internally. Consider the MAX78700 companion chip if galvanic isolation between the high-voltage side and the microcontroller is necessary. Evaluate the available interface options to ensure seamless integration with the target system architecture.

Part Context

The MAX78615+LMU belongs to the Metering Systems on a Chip family from Maxim Integrated. It serves as an isolated energy measurement processor, distinct from polyphase variants like the MAX78615+PPM. This series enables designers to create compact, cost-effective power monitoring units by integrating signal processing and communication interfaces into a single semiconductor solution.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.