Analog Bits Secure Sensor is a highly integrated macro for monitoring temperature and voltage variation on- chip, allowing very high precision even in untrimmed usage. It consumes very little power even in operational mode, and leakage power only when measurement is complete. Included are modes allowing for temperature sensing and supply voltage monitoring. The block includes a simple-to-use digital interface that works with standard core and IO level power supplies. The macro uses core and thick-oxide devices.