System-on-a-chip integrated circuit including dual-function analog and digital inputs
An integrated circuit includes a plurality of inputs, a plurality of output pads, a programmable logic block, an analog circuit block, an analog-to-digital converter programmably coupleable to individual analog circuits in the analog circuit block, and an interconnect architecture programmably coupling selected ones of the plurality of inputs, the plurality of outputs, the programmable logic block, the analog circuit block, and the analog-to-digital converter. At least one of the inputs may be programmably configured as one of a digital input programmably coupleable to elements in the programmable logic block or as an analog input to an analog circuit in the analog circuit block.
1. An integrated circuit comprising:
a plurality of inputs;
a plurality of outputs;
a programmable logic block;
an analog circuit block coupled to at least one of said inputs;
an analog-to-digital converter programmably coupleable to individual analog circuits in said analog circuit block;
an interconnect architecture programmably coupling selected ones of said plurality of inputs, said plurality of outputs, said programmable logic block, said analog circuit block, and said analog-to-digital converter;
wherein at least one of said inputs is programmably configured as one of a digital input programmably coupleable to elements in said programmable logic block with a slew rate less than about 10 MHz or as an analog input to an analog circuit in said analog circuit block.
2. An integrated circuit comprising:
a plurality of inputs;
a plurality of outputs;
a programmable logic block;
an analog circuit block having at least one analog function circuit including at least one operational amplifier, each of said at least one analog function circuits coupled to one of said inputs;
an analog-to-digital converter programmably coupleable to individual analog circuits in said analog circuit block;
an interconnect architecture programmably coupling selected ones of said plurality of inputs, said plurality of outputs, said programmable logic block, said analog circuit block, and said analog-to-digital converter;
a programmable coupling circuit to selectively couple at least one of said inputs to said programmable logic block;
wherein said programmable coupling circuit interrupts power to said at least one operational amplifier when said coupling circuit is programmed to couple said at least one of said inputs to said programmable logic block.
3. The integrated circuit of claim 2 wherein said at least one analog function circuit includes an analog-voltage pre-scaler circuit and said programmable coupling circuit includes a multiplexer having a first input coupled to said at least one of said inputs, a second input coupled to said at least one of said inputs through said analog-voltage pre-scaler circuit, and at least one programmable select input.
4. The integrated circuit of claim 2 wherein said coupling circuit includes at least one first MOS transistor coupled between a power rail and a power input on said at least one operational amplifier, and at least one second MOS transistor coupled between a power rail and a digital buffer coupled between said at least one of said inputs and said programmable logic block, said at least one first and second MOS transistors controlled by a decoder.
5. The integrated circuit of claim 4 wherein said decoder is driven by data on said at least one programmable select input of said multiplexer.
6. The integrated circuit of claim 2 wherein said coupling circuitry has a maximum digital bandwidth of less than about 10 MHz.