ch554t开发板，做usb协议的可以看看
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</colgroup><tbody><tr height="19" style="height:14.25pt">
<td height="19" width="160" style="height:14.25pt;width:120pt">No.</td>
<td width="160" style="width:120pt">Quantity</td>
<td width="160" style="width:120pt">Comment</td>
<td width="160" style="width:120pt">Designator</td>
<td width="160" style="width:120pt">Footprint</td>
<td width="160" style="width:120pt">Value</td>
<td width="160" style="width:120pt">Manufacturer Part</td>
<td width="160" style="width:120pt">Manufacturer</td>
<td width="160" style="width:120pt">Supplier Part</td>
<td width="160" style="width:120pt">Supplier</td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt">1</td>
<td>3</td>
<td>100nF</td>
<td>C1,C2,C3</td>
<td>C0603</td>
<td>100nF</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt">2</td>
<td>1</td>
<td>10uF</td>
<td>C4</td>
<td>C0603</td>
<td>10uF</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt">3</td>
<td>1</td>
<td>47pF</td>
<td>C5</td>
<td>C0603</td>
<td>47pF</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt">4</td>
<td>1</td>
<td>GT-TC025D-H0065-L1</td>
<td>DOWNLOAD1</td>
<td>SW-SMD_4P-L3.0-W2.6-P1.80-LS3.4-TL</td>
<td></td>
<td>GT-TC025D-H0065-L1</td>
<td>G-Switch(品赞)</td>
<td>C778132</td>
<td>LCSC</td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt">5</td>
<td>4</td>
<td>HDR-M_2.54_1x1P</td>
<td>H1,H2,H3,H4</td>
<td>HDR-TH_1P-V-M_XKB_X4611WV-01I-C28D40</td>
<td></td>
<td></td>
<td></td>
<td>C81276</td>
<td></td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt">6</td>
<td>1</td>
<td>10uH</td>
<td>L1</td>
<td>L0603</td>
<td>10uH</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt">7</td>
<td>1</td>
<td>10K</td>
<td>R1</td>
<td>R0603</td>
<td>10K</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt">8</td>
<td>1</td>
<td>CH554T</td>
<td>U1</td>
<td>TSSOP-20_L6.5-W4.4-P0.65-LS6.4-TL</td>
<td></td>
<td>CH554T</td>
<td>WCH(南京沁恒)</td>
<td>C2928938</td>
<td>LCSC</td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt">9</td>
<td>2</td>
<td>HDR1X10</td>
<td>U2,U3</td>
<td>HDR-TH_10P-P2.54-V-F_C9900008052</td>
<td></td>
<td>HDR1X10</td>
<td></td>
<td>C9900008052</td>
<td>LCSC</td>
</tr>
<tr height="19" style="height:14.25pt">
<td height="19" style="height:14.25pt"></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
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