Programmable system on a chip for temperature monitoring and control
A programmable system-on-a-chip integrated circuit device includes a programmable logic block, at least one user non-volatile memory block, and temperature sensing and control analog and digital circuits on a single semiconductor integrated circuit chip or a flip chip, face-to-face, or other multiple die configuration. The programmable system-on-a-chip integrated circuit with temperature measuring and control circuitry performs temperature measurement and control functions and can be used to create an on-chip temperature log.
1. A programmable system-on-a-chip integrated circuit device comprising:
a programmable logic block;
a digital input/output circuit block;
a non-volatile memory block;
an analog circuit block including an analog-to-digital converter;
an analog input/output circuit block including, at least one junction temperature-sensing circuit coupled to a first I/O pad, and at least one programmable MOSFET gate-drive circuit coupled to a second I/O pad; and
a programmable interconnect architecture including programmable elements and interconnect conductors, ones of said programmable elements coupled to said programmable logic block, said non-volatile memory block, said analog circuit block, said analog input/output circuit block, said digital input/output circuit block, and to said interconnect conductors, such that inputs and outputs of said programmable logic block, said non-volatile memory block, said analog circuit block, said analog input/output circuit block, and said digital input/output circuit block can be programmably coupled to one another.
2. The programmable system-on-a-chip integrated circuit device of claim 1 wherein said at least one junction temperature-sensing circuit includes a programmable voltage prescaling circuit.
3. The programmable system-on-a-chip integrated circuit device of claim 1 further including a bandgap reference circuit.
4. The programmable system-on-a-chip integrated circuit device of claim 1 further including a system controller block including a power-up controller configured to apply system power to said programmable logic block, said digital input/output circuit block, said non-volatile memory block, said analog circuit block, and said analog input/output circuit block in a predetermined sequence.
5. The programmable system-on-a-chip integrated circuit device of claim 1 wherein said system controller block further includes a system supervisor block coupled to at least one of said programmable logic block, said digital input/output circuit block, said non-volatile memory block, said analog circuit block, and said analog input/output circuit block, and configured to monitor the junction temperature of at least one junction thermally coupled to a circuit external to the programmable system-on-a-chip integrated circuit device.
6. The programmable system-on-a-chip integrated circuit device of claim 5 wherein said system supervisor block is further configured to control said at least one MOSFET gate-drive circuit in response to the junction temperature of said at least one temperature-sense junction thermally coupled to a circuit external to the programmable system-on-a-chip integrated circuit device.
7. The programmable system-on-a-chip integrated circuit device of claim 6 coupled to a voltage supply in series with a fan motor coupled to said second I/O pad of said programmable system-on-a-chip integrated circuit device.
8. The programmable system-on-a-chip integrated circuit device of claim 6 wherein:
a digital comparator in said programmable logic block has one input programmably coupled to an output of said analog-to-digital converter and another input programmably coupled to a table containing a digital junction-temperature threshold value in said user-available SRAM block in said programmable logic block; and
said system supervisor block is coupled to an output of said digital comparator and is configured to activate said at least one MOSFET gate-drive circuit in response to an output state of said digital comparator.
9. The programmable system-on-a-chip integrated circuit device of claim 6 wherein:
said second I/O pad of said programmable system-on-a-chip integrated circuit device is coupled to a gate of an external MOSFET device having a first source/drain terminal coupled to a first potential and a second source/drain terminal; and
wherein a fan motor is coupled between a second potential and said second source/drain terminal of said external MOSFET device.
10. The programmable system-on-a-chip integrated circuit device of claim 1 , wherein the programmable logic block includes a user-available SRAM block.