SY7T625 - Isolated Metrology Processor for Electricity Metering


  • Isolated AFE interface supports up to four compatible Silergy remote ADCs (up to 8 analog inputs)
  • Powerful 24-bit Compute Engine with 20MHz clock frequency, supported by accelerators for multiply, divide, and square root operations
  • Factory-programmed or field programmable with Silergy provided firmware images
  • 5x5mm 32-pin QFN package
  • SPI host interface
  • Two pulse outputs and 10 additional digital I/O pins
  • 20MHz crystal (or external clock) inter- face for precision timing reference

Typical Application


The SY7T625 is the host side device of an isolated metering chipset for single-phase and poly-phase electricity metering applications. It can be combined with up to four remote ADCs to form a fully isolated meter based on shunt sensors.

The device functions as a completely autonomous metrology processor. A set of pre-processed metrology outputs can be obtained by the host by reading registers that are accessible though the SPI interface. Likewise, system parameters, such as the desired meter constant (Kh), calibration coefficients, sag threshold, and other parameters into the RAM of the SY7T625 by the host.


  • Single or Poly-phase AMI Metering
  • Energy Monitoring