Other Parts Discussed in Thread: TUSB320LI, TUSB320, TPS25910,
Dear Sir/Madam
We are developing a circuit for a customer which should get a type C connector. Therefore we intend to use the TUSB320LI for it, working with the configuration "DRP in I2C mode". Maximum current when acting as a source: 500 mA.
Our circuit works with a Microcontroller (uC) which have an USB2.0 OTG interface with full speed.
The uC have the pins OTG_FS_ID, OTG_FS_DM and OTG_FS_DP.
I use the datasheet: SLLSEQ8D –OCTOBER 2015–REVISED MAY 2017
At first sight Fig. 12 of this datasheet looks good for our application.
Please confirm if I am right?
I would then connect the ID signal of the TUSB320LI with the OTG_FS_ID-Pin of my uC. For the control of the VBUS switch I would use a spare general purpose output (GPO) of our uC. I assume that our uC have to watch the state of the ID-Signal and control this ENABLE-GPO accordingly.
What is confusing me is the Fig. 10 of the datasheet. This is DRP mode too but there the ID-Pin is not connected to the "Processor". Instead the ID-Pin controls the switch directly.
Which use of the ID signal do you recommend?
By the way another question: In Fig.12 the USB signal lines are not connected directly to the uC, instead there is the VBUS switch between. What is the reason for that?
Which VBUS switch would you recommend for our application? In the Users Guide of the TUSB320 Evaluation Module you use the TPS25910. Would this be a good choice for us too?
(As mentioned we source only 500 mA)
Best regards
Christian Zellner
