Maxim Integrated 71M6545T/71M6545HT Energy Meter processors are based on Maxim Integrated's 4th-generation metering architecture supporting the 71M6xxx series of isolated current sensing products that offer drastic reduction in component count, immunity to magnetic tampering, and unparalleled reliability. The 71M6545T/71M6545HT integrates Maxim's Single Converter Technology® with a 22-bit delta sigma ADC, a customizable 32-bit computation engine (CE) for core energy meter functions, as well as a user-programmable 8051-compatible application processor (MPU) core with 64KB flash and 5KB RAM. An external host processor can access energy meter functions directly through the SPI interface, or alternatively through the embedded MPU core in applications requiring energy meter data capture, storage, and preprocessing within the energy meter subsystem. In addition, the devices integrate an RTC, DIO, and UART. A complete array of ICE and development tools, programming libraries, and reference designs enable rapid development and certification of meters that meet all ANSI and IEC electricity metering standards worldwide.