The SY7T501 and SY7T502 are Silergy’s newest energy measurement ICs for cost-sensitive IoT applications such as smart-plugs, dimmers, power-strips, intelligent lighting, and other points of load. The devices feature a line voltage zero-crossing comparator with dedicated state-machine.
A relay control-block with user-programmable on/off delays for latching relays (single and dual coil) and non-latching types is integrated. The relay control-block includes the relay’s contact sensing, allowing timing adjustment to compensate for the relay’s delay variation due to aging and other conditions.
The devices also include a dimming control block for trailing and leading-edge controls, and configurable digital I/Os. A 32-bit signal processing unit with a delta-sigma converter, precision bandgap reference, and analogue front-end allow accurate energy measurement. The on-board UART interface includes the communication protocol with data integrity check and auto-baud function. The ICs are available in SO8 and MSO10 packages.
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