Supply voltage supervisors are used to protect circuitry such as MPUs, DRAM, and other devices that are easily damaged by high voltages or will operate incorrectly at low voltages.
Website that has a complete selection of gyro sensors from several chip manufacturers that can be used as a MEMS gyro sensor or a 3 axis gyro, among other uses. Also a useful resource for understanding what is a gyro sensor.
A complete selection of sensors including Accelerometer, Angular Position, Gyro, Humidity / Dew, Linear Position, Magnetic / Hall Effect, Motion, Pressure, Proximity and Temperature that can be used for all kinds of sensing applications for circuits.