Low-cost solution for converting the micro USB port of your phone to a USB Type C connector

we know that the ultimate goal of the USB if proposed type C connector is to unify various USB interfaces.

Despite the development of USB 3.0 in the PC market, but due to the USB 3.0 on the phone 4G LTE EMI and RFI interference, resulting in the market in addition to Samsung phones with USB 3.0 interface, other manufacturers are unable to solve the USB 3.0 on the RF EMI and RFI interference to the handset on the shelf.

If you want to implement the full function of type C interface, need cable Detect IC assistance, and CD function is generally integrated into the USB PD chip, because the current USB PD chip in the market is relatively small and expensive, considering the cost factors, the general handset manufacturers will not adopt this scheme, If the USB Type C connector is canceled because of the CD IC, then our phone will be less than a USB cable Plug and go selling point, so I give a Micro USB 2.0 port in the existing mobile phone to the Type C interface of the low-cost solution, one shows.

Figure A

we know that Type C has the advantage of positive and negative interpolation, and is divided into a and B plane, the recognition principle is through the mother of the A side of the A5 (CC1) and B-side of the B5 (CC2) pin detection of the male plug cc which access to the pull-down RD resistor to determine the positive and negative, and a and B sides have d+ While the male plug cable is only a side with d+ and D-line.

The procedure for the mother's mouth is as follows:

1) Connect the d+ (A6, B6), D (A7, B7) of the A and b sides of the female port to the USB OTG chip d+ and D-on;

2) Connect the mother Port A4, A9, B4, B9 four vbus lines to the Vbus on the USB OTG chip;

3) Connect the A1, A12, B1, B12 four GND lines of the female port to the GND of the USB OTG chip;

4) Connect the A5 of the female port, B5 two cc, to the ID pin of the USB OTG chip;

5) Two USB 3.0 channels and SBU1, SBU2 pins are either floating or grounded.

The procedure for male plugs is as follows:

1) Connect the male plug A4, A9, B4, B9 four vbus lines together;

2) connect the male plug A1, A12, B1, B12 four gnd lines together;

3) The male plug A5, B5 two cc connected together, here in two cases, if the cable is to be made to support the OTG line, need to add a pull-down resistor on the CC line, if OTG is not supported then the CC line floating;

4) USB 2.0 Type C cable does not have USB 3.0 channel and SBU1, SBU2 pin, so it is not processed.

In accordance with the above practice, the mobile phone can be implemented USB Type C cable forward and reverse.

Low-cost scenario for converting a phone micro USB port to a USB Type C connector