Monitoring Temperature of Semiconductor Chips by Multiplexed Sensing of Current and Voltage of Off Chip Driver Emitted Follower Circuits Using Microprocessor
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Each chip that is to be monitored for temperature has a temperaturesensing transistor that has its emitter terminal connected to an output point of the chip in the conventional configuration of an off-chip driver. The collector terminal of each temperature sensing transistor is connected to a common potential point, and the base terminal is connected to a separate selection circuit that turns on one of these transistors at a time. All of the emitter terminals are connected on a common line to a circuit that measures the emitter current and the voltage between the emitter and the collector potential point. The current and voltage measurements are digitized and sent to a microprocessor.