PSoC 4 Prototyping kit : Power issue

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ShVy_264716
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Hi All

   

I am using a PSoC 4 Prototyping kit for a project. My system has to work on 5 Volt. When I connect the kit and other hardware to Miniprog3 and program the kit from the Creator, The project works as per the set goals. But when I disconnect the Miniprog3 after programming and give separate 5 Volt supply to the hardware, the project does not work. I have changed the VDDA and VDDD to 5 Volt in the .cydwr file System configuration as I wanted to configure ADC on 5 Volt reference. Any solution to this would be appreciated.

   

Thanks in advance.

   

 

   

Regards

   

Shaunak

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ETRO_SSN583
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What board are you using ?

   

 

   

Regards, Dana.

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Bob_Marlowe
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From your post I deduct that you are using a CY8C-049-4xxx Prototyping kit.

   

When programming and debugging with MiniProg3 works as expected, the only changes appear to be the 5V supply.

   

Can you please check your 5V for stability (ripple, noise, tolerance) using a scope and the usual test-methods

   

 

   

Bob

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ETRO_SSN583
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From your post I cannot deduct what board you are using, is it (042)

   

 

   

   

 

   

 

   

 

   

 

   

 

   

 

   

 

   

 

   

 

   

or this (049) -

   

 

   

CY8CKit-049

   

 

   

or this (044) ?

   

 

   

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Bob_Marlowe
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@Dana,

   

maybe I'm wrong, but I thought that the -42 and the -44 are named "Pioneer", while the -49 is named "Prototype"

   

 

   

Bob

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ShVy_264716
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@Dana and Bob: I am using CY8CKIT-049 42xx.

   

@Bob: I am using an Industrially tested power supply, so durability is not an issue.

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Bob_Marlowe
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Nonetheless I would suggest you to check the 5V power on the board.

   

 

   

Bob

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ShVy_264716
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@Bob: I checked it on board. It is coming as per the requirement.

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ETRO_SSN583
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They are all prototyping, development, design boards.

   

 

   

Dana.

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rola_264706
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Here is some information

   
    ■   
   
    1.8-5 V from a regulated supply connected to VDD   
   
    It is important to understand that this prototyp   
   
    ing kit does not have any onboard ESD protection cir-   
   
    cuitry. Therefore, the power source for the CY8CKI   
   
    T-049-4xxx must be of a high quality to ensure   
   
    that the board is protected from any over-cur   
   
    rent conditions and sw   
   
    apped-power connections.   
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rola_264706
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And this

   
    Power Pin Connections   
   
    PSoC   
   
    4100/4200   
   
    devices can be powered in regulated mode  or   
   
    unregulated mode. Power pin connections for these two   
   
    modes are illustrated in Figure 1and Figure 2   
   
    . In regulated mode,the internal regulators convert VDDD  input to the power supply for the digital domain. Voltages at the VDDD pins can be from 1.8 V to 5.5V.  Outputs of the regulators are also routed  to  VCCD   
   
    . Do not connect any external load to VCCD except a capacitor, as Figure 1shows in AN88619   
   
    
     IIn both modes, to suppress power supply noise,connect one 0.1-μF and one 1-μF ceramic decoupling capcapacitor to each power supply pin. The PCB trace between the    
    
     pin and the capacitors should be as short as possible. For more information,see Appendix A:PCB laylayout Tips    
    
     Sorry about the formating issues.    
    
     .    
   
   
    

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ShVy_264716
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@bobgoar: I am afraid to say but your post on the thread is not readable and so I could not understand what you tried to convey. Can you please re-post your suggestions?

   

@all: I can not find any solution to the problem yet. Though when I put on my power supply instead of Miniprog3, give a momentary GROUND to the reset and then give HIGH to reset, the circuit works. I do not want to manually GROUND the Reset each time I power ON the circuit. This is the first time I am facing this situation, so any help would be highly appreciated.

   

Thanks in advance.

   

 

   

Regards

   

Shaunak

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Bob_Marlowe
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There are restrictions in the specs of the PSoC regarding power-up ramp. It might turn out that the supply does not come up fast enough. Can you generate a Power-Good signal to use it for XRes?

   

 

   

Bob

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ShVy_264716
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@Bob: How can I generate a Power-Good signal?

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Bob_Marlowe
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External R-C and OpAmp to delay (100ms) the XRes signal

   

 

   

Bob

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Anonymous
Not applicable

 have you changed the setting for the miniprong

   

In the tools->options->program/Debug->port configuration  

   

It might be set wrong 

   

 

   

Hope it helps

   

Max Foster 

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ETRO_SSN583
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@Bob

   

 

   

There are restrictions in the specs of the PSoC regarding power-up ramp.

   


   

What are those specs, I cannot find any other than min operating levels,

   

nothing related to ramp time....

   

 

   

Regards, Dana.

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ETRO_SSN583
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From -

   

 

   

     

   

          

   

http://www.cypress.com/?rID=93402     AN88619 - PSoC® 4100/4200 Hardware Design Considerations

   

 

   

 

   

 

   

 

   

Regards, Dana.

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ShVy_264716
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@Max Foster: My circuit works well with MiniProg3 supply, so that is not an issue.

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ShVy_264716
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@Bob and Dana: I have set VDDA and VDDD at 5 Volts.

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ETRO_SSN583
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ShVy_264716
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Dana,

   

I tried with 0.1 uF capacitor, but it is not working.

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Bob_Marlowe
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@Dana

   

Great, you found what I was talking about. I was still seeking...

   

 

   

Bob

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ETRO_SSN583
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I filed a case on this to get the spec added to datasheets.

   

 

   

Regards, Dana.

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Bob_Marlowe
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@Shaunak

   

Can you please post your project here. Which version of Creator are you using? 3.1 or 3.2??

   

 

   

Bob

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Anonymous
Not applicable

 have you checked that the poly switch is working? 

   

A few ohms when unplugged checking for a near dead short between the pads. 

   

Also make sure your getting 5 ish volts after the poly switch 

   

 

   

Hope it helps 

   

Max Foster 

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ETRO_SSN583
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@Bob

   

 

   

There are restrictions in the specs of the PSoC regarding power-up ramp. It might turn out that the supply does not come up fast enough. Can you generate a Power-Good signal to use it for XRes?

   

 

   

The spec is a maximum ramp rate, not a minimum. Maybe CASE will resolve that as well.

   

 

   

Regards, Dana.

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rola_264706
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Shauna What I was trying to tell you with the spec posts on the PSOC 4 devices is that you need a good regulated power source for your board.  I agree with the others that it could be a slew rate issue on your supply.  I do not know that kind of supply you are using so we can only guess at your issue.  Do you have a scope so you can look at the power source for the ripple and slew rates?  I am from the old school you can never have too good of a supply for your design. Also sometimes more caps are   needed  to fix the issue. So you can shunt the issues to ground but without a scope you are shooting in the dark. .

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