SY7T502FBC (SY7T502FBC)

• High Resolution Delta-Sigma ADC with Two Analog (Sensor) Inputs 
• Internal Precision Voltage Reference
• Internal Trimmed Timing Reference 
• Fixed Function Digital Signal Processing Block 
• UART Interface with Auto-Baud Function
• Integrated Control for Latching and Non-latching Single and Dual Coil Relays
• Relay Contact Sensing Feedback
• Integrated Dimmer Control (Leading/Trailing- edge)
• Integrated AC Line Voltage Zero-Crossing Detector
• Digital I/O’s Individually Configurable as Open Drain or Push-Pull, 5V Tolerant
• Small MSOP-10 Package

The SY7T502 is an energy measurement IC monitoring any single-phase (2-wire) loads. The SY7T502 is ideally suited for applications such as smart-plugs, smart appliances, lighting and building automation.

The SY7T502 UART interface supports low baud rates to allow low-cost isolation when required. Additionally, the UART includes auto-baud function (detects and adjust baud rate to host’s rate).

The analog front end (AFE) provides a differential input for current sensing and two single-end inputs dedicated to Line Voltage acquisition and relay’s sense. A high-resolution delta-sigma converter feeds a fixed function digital signal processing block performing rms, active power and energy accumulation calculations. The analog front-end includes a comparator and relevant state machine providing voltage zero-crossing reference to internal blocks, and available on DO0 output.

The SY7T502 features a relay control bock with user programmable On /Off delays and relay’s feedback for continuous timing adjustment (closed loop control). The control block supports latching (single/dual coil) and non-latching relay types. The SY7T502 includes a user-programmable trailing and leading-edge dimmer control block.