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Hi,
There are several uncomitted OpAmps on some PSoC3s
The outputs seem to be connected to specific pins. Does this mean I can't route them to other pins? Does it mean I can't route them to other internal devices? E.G. ADC.
The inputs also seem to be connected to specific pins, but according to the TRM, there seems to be more options for connecting them to other buses. Is there some advantage to using those specific pins rather than other pins?
Is there any advantage to using those OpAmps rather than the ones in the SC/CT blocks?
Hugo
Solved! Go to Solution.
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PSoC 3
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These ap notes may help -
http://www.cypress.com/?rID=39974
http://www.cypress.com/?rID=57571
Related Application Notes
AN54181 – Getting Started with PSoC 3
AN60631 – PSoC 3 Clocking Resources
AN58304 – PSoC 3 and PSoC 5LP - Pin Selection for
Analog Designs
AN58827 – Internal Routing Considerations for
PSoC 3 and PSoC 5LP Analog Designs
AN54460 – Interrupt Handling in PSoC 3
AN60580 – SIO Tips and Tricks in PSoC 3 and
PSoC 5LP
AN66083 – Using Sleep and Hibernate Modes in
PSoC 3
AN52705 – PSoC 3 and PSoC 5LP - Getting Started
with DMA
Regards, Dana.
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These ap notes may help -
http://www.cypress.com/?rID=39974
http://www.cypress.com/?rID=57571
Related Application Notes
AN54181 – Getting Started with PSoC 3
AN60631 – PSoC 3 Clocking Resources
AN58304 – PSoC 3 and PSoC 5LP - Pin Selection for
Analog Designs
AN58827 – Internal Routing Considerations for
PSoC 3 and PSoC 5LP Analog Designs
AN54460 – Interrupt Handling in PSoC 3
AN60580 – SIO Tips and Tricks in PSoC 3 and
PSoC 5LP
AN66083 – Using Sleep and Hibernate Modes in
PSoC 3
AN52705 – PSoC 3 and PSoC 5LP - Getting Started
with DMA
Regards, Dana.
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Whenever you use one of the opamps its dedicated pins will be in use and cannot be used by another component. The router is able to connect that opamp to another pin when required, but the dedicated pins will still be in use. So the route is "hopping" from the dedicated pin to the target.
This was used to have low-impandence connections for some of the internal devices to the outside.
Bob
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Modificatiuon to what Bob said. Just the OpAmp output pin becomes dedicated,
not its inputs.
Opamp Pin Selection
The opamps are connected to the GPIOs in such a way that they can be used without
any internal analog global busses, See Figure 12. If all connections to the opamp are
external through the GPIOs, it is a good idea to use the dedicated pins. In many cases,
the opamp may be used as a buffer to an internally generated signal, such as a buffer to
a VDAC output. In this case the dedicated opamp input pins may be ignored and used for
another purpose. After the opamp is enabled, the dedicated output GPIO will always be
driven by the output of the opamp. This GPIO is now dedicated to the opamp output and
cannot be used for another signal. Even if this signal is only used internally, the dedicated
output pin will be driven by the opamp. This guarantees that the resistance between the
opamp and GPIO pin is low, about 5 ohms. If you must use a different pin for the output,
the dedicated output pin still outputs the signal. If the opamp is not used, it has no affect
on the GPIOs directly connected to it. These GPIO pins operate as any of the other GPIOs
when the opamp is disabled.
Regards, Dana.
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Makes one wonder if the output pin can be over-ridden with a register write.
After all out R in the path of an OpAmp output, its effective Zo becomes divided
by loop gain.
Regards, Dana.