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Forum Index : Microcontroller and PC projects : VT100 capacitor
| Author | Message | ||||
| hitsware Guru  Joined: 23/11/2012 Location: United StatesPosts: 535 |
Does the capacitor (pin 19 to 20) on the VT100 chip need to meet the same specs as for the MicroMite ? |
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MicroBlocks Guru Joined: 12/05/2012 Location: ThailandPosts: 2209 |
Yep. Get a multilayer ceramic XR5 10uF. They work fine. Microblocks. Build with logic. |
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Lou Senior Member  Joined: 01/02/2014 Location: United StatesPosts: 229 |
hitsware, The VT100 chip is the same chip as the MicroMite, so use the same cap. I use a 10uF SMD multilayer ceramic on my PC boards now, I have used a 22uF thru-hole tantalum in the past on my protoboards without problem. Lou Microcontrollers - the other white meat |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
I agree with other posters. If you are making a PCB, I recommend the multilayer ceramic as mentioned by others - 10uF, but just make sure you get the X5R type. They are a little more expensive then the cheaper SMD caps, but there is a reason that this cap needs to be X5R, so don't use anything else if you are using SMD ceramic. 
Otherwise, as others say - you can use a standard Tantalum type - 22uF - 47uF. @ Lou - the VT100 chip is a different part to that of the uM chip, but the cap requirements are the same. Smoke makes things work. When the smoke gets out, it stops! |
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| hitsware Guru Joined: 23/11/2012 Location: United StatesPosts: 535 |
When I got the caps for the MicroMite, I ended up with 470uF in order to meet the ESR specified (which I now forget). I'm looking for ceramic, but with leads .... I'll add X5R .... |
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| hitsware Guru Joined: 23/11/2012 Location: United StatesPosts: 535 |
Here we go ............ |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
Those should do the job nicely, and are from a quality brand name too.  Smoke makes things work. When the smoke gets out, it stops! |
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| hitsware Guru Joined: 23/11/2012 Location: United StatesPosts: 535 |
What's the significance of 'XR5' ? |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
There are others more qualified to answer that then me, but from what I understand, it is essentially a quality rating. From what I gather, standard ceramic caps can vary in capacitance quite a bit depending on voltage, temperature etc. X5R are more stable across variations then cheaper ones, and I think they also have better ESR then cheaper caps. Hopefully, someone will chime in here with the correct knowledge, and explain it better then me. I do remember there were threads in the past on this subject, and from what I can remember, it was important that you chose X5R type caps, if you were using multi-layer ceramics. The X5R thing does not apply for standard Tantalum caps. Smoke makes things work. When the smoke gets out, it stops! |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3272 |
You got it right Grogs! XR5 is the type of dielectric and its features are as you described. Geoff Graham - http://geoffg.net |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
Yay!  Smoke makes things work. When the smoke gets out, it stops! |
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