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CH341A
USB to UART / printer port / parallel port / 2-wire / 4-wire, SOIC-28 (SOP-28)
Schematic Symbol
Pin Configuration (28 pins)
| Pin | Name | Type |
|---|---|---|
| 21 | ~{RTS}/D6 | tri_state |
| 22 | ~{SLP}/D7 | tri_state |
| 23 | SDA | bidirectional |
| 24 | SCL | open_collector |
| 25 | ~{RDY}/~{STB}/~{WR} | output |
| 26 | TNOW/~{INI}/~{RST} | output |
| 27 | ~{TEN}/BUSY/~{WT} | passive |
| 28 | VCC | power_in |
| 1 | ~{ACT} | output |
| 2 | RSTI | passive |
| 3 | IN7/~{SIN}/~{AS} | tri_state |
| 4 | ~{ROV}/~{AFD}/~{DS} | tri_state |
| 5 | TXD/~{ERR} | bidirectional |
| 6 | RXD/PEMP | input |
| 7 | ~{INT}/~{ACK} | passive |
| 8 | IN3/SLCT | passive |
| 9 | V3 | passive |
| 10 | UD+ | bidirectional |
| 11 | UD- | bidirectional |
| 12 | GND | power_in |
| 13 | XI | input |
| 14 | XO | output |
| 15 | ~{CTS}/D0 | tri_state |
| 16 | ~{DSR}/D1 | tri_state |
| 17 | ~{RI}/D2 | tri_state |
| 18 | ~{DCD}/D3 | tri_state |
| 19 | ~{OUT}/D4 | tri_state |
| 20 | ~{DTR}/D5 | tri_state |
Footprint
ConfirmedPackage_SO/SOIC-28W_7.5x17.9mm_P1.27mm
Pad Layout
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Pads (28)
| Number | Type |
|---|---|
| 1 | smd |
| 2 | smd |
| 3 | smd |
| 4 | smd |
| 5 | smd |
| 6 | smd |
| 7 | smd |
| 8 | smd |
| 9 | smd |
| 10 | smd |
| 11 | smd |
| 12 | smd |
| 13 | smd |
| 14 | smd |
| 15 | smd |
| 16 | smd |
| 17 | smd |
| 18 | smd |
| 19 | smd |
| 20 | smd |
| 21 | smd |
| 22 | smd |
| 23 | smd |
| 24 | smd |
| 25 | smd |
| 26 | smd |
| 27 | smd |
| 28 | smd |