PC extension vl822+fe2.1+rtl8153 (fully verified)

Vl822 and fan voltage control verification (with video):

fe2.1 has also been verified;

The conclusion is okay;

# 2022/08/27:

I'll solder the network card part again when I have free time in the future. It should be fine. Refer to the person who verified the circuit;

Network card part rtl8153 reference: https://oshwhub.com/Kirito/usb3-0-wang-ka-rtl8153b

vl822-q7 partial reference: https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/tbt3_5F00_card_5F00_V11.pdf

fe2.1 part reference: https://oshwhub.com/msraphael/FE2.1fang-an-yan-zheng-ban

Fan speed is directly controlled by MP2225 voltage;

The soldering pad on the network card part was scratched off due to scraps of hands. It was not soldered;

I described the circuit in words, not drawings;

#20220830:

I re-soldered the board and the network card;

#20220831: 

    rtl8153 seems to only have a speed of more than 30M. After checking the information, it requires RX TX docking. After flying 4 lines, the speed was 110MB/S;

   At the same time, the speed verification video was uploaded and the PCB RX1 and TX1 lines were corrected;

# Notice:

5v to 3.3v and 2 3.3v to 1.05v. It is recommended to add a heat sink for a total of 3 LDO buck chips. After all, the voltage difference is a bit large;

Because rtl8153 uses built-in LDO to convert to 3.3V, and built-in LDO to convert to 1.05V, which are also two LDOs to step down, a heat sink must be added;

Another netizen asked how to draw a schematic diagram. In fact, I always look at other people's schematic diagrams and then record:

Example: vl822:

# USBOC0, USBOC1, USBOC2, USBOC3, USBOC4(3.3v input or IO):
    3.3v -> 10k -> USBOCn;
    # Description:
        Overcurrent detection; open drain input and output (maximum 3.3V),
        plus pull-up resistor connected to 3.3V;
        when the PIN receives a low level, the chip overcurrent event is triggered;
        when the PIN receives a high level, it can be used normally;
        OC0 is the upstream detection, 0C1-4 is the downstream detection;
        
# USBPE 0-4(output ):
    It's just an indication of turning on. When the USB is inserted and transmitted, the PIN will be low or high. Then the meter will test it and it
    will be either high or low;
    
    
# VBUSDET0 (input 3.3V):
    5V -> (4.7k, 10k) points After voltage = 3.401V -> 2M resistor -> VBUSDET;
    # Description:
        The chip detects whether VBUS is connected. It does not use much current, so add 2M.
        

    #     USBX I ,
    USB        ​​     ​Ground;     # Description:         Whether to turn on the test mode, if the low level does not turn on, it will be used normally;         if it receives a high level, it will turn on;
    
    




        
    
        





    

# GPIO 0->4, 5_EXTPWR, 6_USBSUS (I/O):
    used to modify firmware values, can be NC;
    EXTPWR:
        actually useless, both USB3 ports require 1.4A current;
        even if the downstream is negotiated to allow more The current is not used so much and it is not used for fast charging;
        
    
    
# GPIO7_SMDATA, GPIO8_SMCLK(I/O):
    3.3V -> 4.7K resistor -> GOIO7;
    3.3V -> 4.7K resistor -> GOIO8;
    
    # Description:
        SMBUS DATA and CLOCK, open drain;
        

# RESET#(input):
    3.3V -> (10k, 100K) after voltage division = 2.999V -> 105(1uf) -> RESET;
    
    # Description:
        External reset button, the PIN low level chip restarts, high power is normal Use ING;