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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

 Hi, I am developing a medicine  application which includes a programmed Cypress CY8C27443-24PXi integrated circuit. I have been trying to use  it  on a protoboard instead of the PSoC itself for space purpose. I have found  out that, after programming it and putting it on my protobard  to test it, it  does not work. I have put the power lines properly and checked  the pin out diagram for the correct input and output ports but it seems like it does not want  to work at all. I put it  back  to the PSoC  and connect  it to my protoboard with some jumpers  and works just right. Is there something that needs to be considered for the IC to work out of the plataform on a protoboard or on a PCB  desing?

   

Any help would be appreciated.

   

Thanks.

   

Juan Luis Gantus Bernés.

   

9th. Semester Student  of Biomedical Engieering.

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1 Solution
JoMe_264151
Expert II

There is nothing secret / extra to run a PSoC when it is programmed, so you will have to concentrate on the differences between your two configurations.

   

Power supply: Voltage, Noise

   

Bad contacts

   

Caps

   

 

   

Bob

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8 Replies
JoMe_264151
Expert II

There is nothing secret / extra to run a PSoC when it is programmed, so you will have to concentrate on the differences between your two configurations.

   

Power supply: Voltage, Noise

   

Bad contacts

   

Caps

   

 

   

Bob

View solution in original post

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Anonymous
Not applicable

 I have and still not working. I have double checked the  pin out  diagram and the input and outputs thatI declare and proceed to connect  it to the next stage of my circuit  and yet still working wrong. I put pin number 28 (VDD)  to 5V  and  pin number 14(VSS) to ground and use the other declared  ports as inputs and outputs but the resulting signal is not what I should get (Already  got it  on the PSoC board).

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JoMe_264151
Expert II

There is no way out, there is an error in your board.

   

I asked for the noise on your 5V supply. How much is it?

   

Are you using an x-tal on any of your boards?

   

 

   

Bob

Anonymous
Not applicable

 The 5V power supply is just  fine, I  am using a medical grade power supply and regarding the  x-tal the answer is no, I am not using one, I am using the IC internal oscillator. I will keep testing it but for now it  is just not working on my protoboard. Thanks for the help though.

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JoMe_264151
Expert II

" I  am using a medical grade power supply" This is a quality guarant for man-safe design, but not for low noise.

   

"Anything that is not expressed with numbers is a pure opinion" (Robert A Heinlein)

   

 

   

Bob

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ETRO_SSN583
Esteemed Contributor

You have a bypass on the protoboard of typically 10 uF

   

electrolytic and a .1 uF ceramic ? Next to Vdd lead.

   

 

   

The grounds are commoned to one rail on the board ?

   

 

   

You have looked at Vdd with scope, and see < ~ 200 mV noise pk - pk ?

   

Scope if DSO put on infinite persistence when you do this.

   

 

   

Post a picture of board and wiring.

   

 

   

Regards, Dana.

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Anonymous
Not applicable

 Thanks, Dana. I checked everything. Now my circuit is working as it is  supposed to.

   

BTW, Bob, a medical grade power supply is indeed a man-safe guarantee but it's also accurate with its technical specifications since it is made  for  medical applications. Thanks for  not helping, though!

   

Problem solved.

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ETRO_SSN583
Esteemed Contributor

I had occasion as a field engineer to represent several companies

   

making medical grade power supplies. Noise, conducted and radiated,

   

was indeed very much a concern and speced. In light of the issues

   

surrounding EKG, EEG, and other sensor technologies, a lot of attention

   

and specification covered the topic of noise, shielding, transmission,

   

etc..

   

 

   

I worked (as FAE) on portable MRI machine where an extensive, beyond datasheet,

   

charcterization was done and manufacturer advised of changes to upgrade  their

   

already low noise supplies. Capacitor technologies were also extensively examined.

   

As well as LCD display emitted noise and B/L inveter technology.

   

 

   

Regards, Dana.

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