CH340 Datasheet (I)
6
03H
WP
Internal configuration information write protect flag
57H imply read only, otherwise can be rewrite
00H
05H~04H
VID
Vendor ID, high byte is behind, any value. Set to 0000H or
0FFFFH implies VID and PID using vendor default value
1A86H
07H~06H
PID
Product ID, high byte is behind, any value
7523H
0AH
PWR
Max Power, The maximum supply current in 2mA units
31H
17H~10H
SN
Serial Number, the length of ASCII string is 8, disable the
Serial number when the first byte is not ASCII character
(21H~7FH)
12345678
3FH~1AH
PROD
For CH340B: Product String, Unicode string for product
description. The first byte is by total bytes (less than 26H),
the next byte is 03H, Unicode string after that, using
vendor default description when do not meet
characteristics above.
Using product
default
description when
the first byte is
00H
Others
(Reserved)
00H or FFH
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