An easily obtainable metal bracket is a must have, More power at the USB port would be nice, These laptop hard drives can be power hungry buggers, Some requiring 1 amp or more at spin up Better support for the USB port on the PCB, The USB ports can be replaced with headers for attaching panel mount USB ports if required. Can't think of anything else at the mo.
Thanks for this. The USB spec allows devices to draw max. 100mA from the host when connected. The CH375/6 reference schematic, which the Lo-tech board follows, simply includes a series 2R resistor to allow for this with minimal drop whilst limiting contact current on connection. The connected device can subsequently draw up to 500mA, but only after negotiation with the host. In other words, a device cannot assume 500mA is available.
I think it should be possible to provide 500mA support, which should enable any bus-powered USB2 device to work since that is the limit outside of the battery charging standards. However, it seems to me that the way this would be done is by putting a USB hub in front of the CH375 along with the associated power distribution switches. At a quick count, this adds about 15 components to the board.
We'd need to test if the CH375/6 will work with a mass storage device attached through a USB hub in the first instance (I can't say I've ever owned a USB hub!).
On the other hand, if it does work, perhaps it might be possible to support more than one attached storage device on a single CH375/6? Possibly ISSUE_TOKEN @FreddyV might be of use?