The DS1231S-20+ is a Supervisory Circuits Power Monitor manufactured by Analog Devices. It is used as an integrated power monitor to measure voltage, current, and temperature levels in power supply circuits. It features several supervising functions such as power-on reset, watchdog timer, and system reset. It also provides several thresholds such as temperature, voltage, and current. Additionally, it has an adjustable delay timer, low resistor divider, and low current current-sensing programmability. Its output is a push-pull signal which can be used to drive LED indicators. The DS1231S-20+ is designed to be used in embedded systems, cellular phones, and surveillance systems.