Shown here is an example application of PSoC 4 controlling three aspects of system management and control. A thermal management via a closed-loop fan controller with up to 4 fans per PSoC 4 device, and power management with each PSoC 4 able to sequence up to 17 power rails and trim and margin up to 12 power rails. PSoC can also monitor voltages at plus or minus 1.5% accuracy to detect over and under voltage fault conditions. The PSoC 4 communication bridging using serial host interfaces such as I2C, UART, SMBus and PMBus. The customer can build custom communication interfaces using PSoC 4 UDBs. The PSoC 4 is a one-chip solution for customized system management and control.