Harpo
Well-known member
In Eagle click on the 'Ratsnest' button and the status line will tell you, if there are any unrouted airwires left.
michal_k said:This is the last(I hope) revision of the i2c attenuator board:
http://cl.ly/3O2v0w443I1N2S250g3M
I've decided to add pga2311 chips to the digital part of the proto board as well. I'll see how they work and if I see any noticeable differece.
I could have chosen +-15V version of pga, but I've ordered parts late at night and somehow missed it. Now, question:
- Can I run pga2311 of 3.3V rails? Datasheet says 5V, but I figured out I'll ask before putting one more regulator on the pcb.
- If pga2311 runs on 5V and msp430 on 3.3V rails, will I have any problems with logical levels in SPI interface?
- When using SPI interface, can I select Chip enable for both pga's and send data only one time since data for both of the chips is always the same(balanced configuration)? (seems logical)
My schematic:
http://cl.ly/1D150y3s1E070H010S0i
PS I haven't figured out what pins of the msp430 should be connected to the spi data and spi clock
Rochey said:The 2311 will need a 5V, but you can interface 3V3 into it. (SPI).
You may want to use some voltage translation on the SPI, just to ensure that there's no surprises.
michal_k said:I know I am probably boring everyone to death, but a quick question about ground planes. Here's my current situation:
http://cl.ly/1p3Y1M1p3j35030b2K3s
Should I have another ground plane on the top layer? Because of the power supply star thingy the parts of the bottom ground plane are not connected together and I could lay another one on the top layer and fix it with a little bit of via magic. Any possible problems with that solution? That's how it would look like:
http://cl.ly/1x3Z1Y1L3m2b2A3h0U2K
first time I used national plant rather than chinese manufacturer. All I can say is wow, quality is beyond amazing compared to chinese products.
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