On 3/3/2015 11:39 PM, Michael Kennedy wrote:
Looking for some advice on how to make this.

I need to make a DTDP analog switch work with a few second delay after
receiving input.

I was thinking about a 555 and some kind of analog switch like an AD7512
or something like that.


For example, I have a usb cable I will plug into a tablet. It needs to
short the D+ and D- pins (on the cable going to the tablet) together for
a couple of seconds then connect the the D+ and D- (from a usb hub).


You can read my description below or look at the circuit I drew here.

http://tinypic.com/r/3326wpf/8

The hub will provide power to charge the tablet, but to put the tablet
into charge mode you need to short the pins first. After that you can
disconnect the short and it will continue charging. Switch in the USB
hub's data lines and everything is working. Charging and connected to a
hub all on one USB port.

Do you need it automatic, or can you just put a DPDT momentary switch
on it and be done?
Mikek

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