Introduction
The Si890x isolated 10-bit monitoring ADCs integrate a 10-bit SAR ADC subsystem, supervisory state machine and isolated UART (Si8900), I2C/SMbus port (Si8901), or SPI Port (Si8902) into a single 16 SOW package. Based on Silicon Labs proprietary CMOS isolation technology, the Si890x series offers isolation ratings of 2.5 or 5.0 kV and finds use across a wide range of low-frequency analog data acquisition applications including isolated ac line monitors, sensor interface circuits, power-delivery systems, and solar inverters. Si890x devices operate in slave mode and must be managed by an external master controller (typically an MCU). This application note provides useful recommendations for configuring the users master controller for operation with the Si890x including serial port resynchronization and recovery from loss of VDD.