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November 14, 2011
about 5 years ago
Also in FIG 4 of the instructions the #4 points to CH_EN, but it is supposedly pointing to CH_EN.
Also in FIG 4 of the instructions the #4 points to DC_ON, but it is supposedly pointing to CH_EN.
Sorry for the confusion.
There are inconsistencies with the schematic designations SJx and the documentation designations of VCIO Select and CH_EN.
The DC_ON pads don’t seem to be listed in the schematic or datasheet and the #4 points to it erroneously for CH_EN. The arrow should be to the left about ¼".
The sense of CH_EN is different for the schematic and the shipped version. If the instructions say it should be removed then so should the schematic, but the instructions say remove and the schematic says install for opposite correct functionality and thus if you look at the schematic you think the default is removed, but when you read the instructions, the default is installed.
I’m very confused.
There are pads labeled CH_EN and DC_ON BUT they don’t exist as those designations in the schematic.
Why should the schematic say “Close to Enable Battery Charging” and here they are Talking about SJ1. Isn’t SJ1 closed when shipped? Isn’t SJ1 really CH_EN?
Where/what does SJ2 in the schematic do? Where is it on the PCB?
SJ2 is I guess VCIO select and is described in #6.
Question still remains what is DC_ON and why does #4 in Fig 4 point to it?
I ordered this board and I hope some of my difficulties will become more clearer when I get it.
The documentation doesn’t map component designations to the silk screen.
I think the data sheet should mention the prototype area and the overall dimensions although it’s in the detailed drawing.
The info for VCIO select really doesn’t tell you what the position is for in or out. I think I get it, though.
4.The p.n of U4 isn’t listed in the schematic, but the p/n’s of all of the other parts are. Is this a 3.3 shunt regulator?
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