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CH341 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

Part # CH341
Description  USB bus convert chip
PDF  14 Pages
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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CH341 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

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The DataSheet of CH341 (the first)
4
4.3.Asynchronous serial interface pins
Pin No.
341A
341T
Pin Name
Pin Type
Pin Description
5
3
TXD
OUT
Serial data output
6
4
RXD
IN
Serial data input, with pull-up resistor
27
19
TEN#
IN
Serial transfer enable, active with low-level, with pull-up
resistor
25
17
RDY#
OUT
Serial receive is ready, low-level active
26
18
TNOW
OUT
Indicate serial interface transfer is carrying out, high-level
active
4
2
ROV#
Tri-state
Output
Serial receive buffer overflow, low-level active
15
No
CTS#
IN
MODEM liaison input signal, clear transfer, low-level
active
16
No
DSR#
IN
MODEM liaison input signal, data equipment is ready,
low-level active
17
No
RI#
IN
MODEM liaison input signal, indication with bell,
low-level active
18
No
DCD#
IN
MODEM communication input signal, carrier wave
detection, low-level active
20
No
DTR#
Tri-state
Output
MODEM liaison output signal, data terminal ready,
low-level active
21
No
RST#
Tri-state
Output
MODEM liaison output signal, request transferring,
low-level active
19
No
OUT#
Tri-state
Output
Self-define common output signal, low-level active
7
5
INT#
IN
Self-define interrupt request, rising edge active, with
pull-up resistor
8
No
IN3
IN
Self-define common input signal, un-connection is
recommended
3
No
IN7
IN
Self-define common input signal, un-connection is
recommended
22
14
SLP#
Tri-state
Output
Sleep state output signal, low-level active
4.4.Print interface mode pins
341A
Pin No.
Pin Name
Pin Type
Pin Description
22~15
D7~D0
Tri-state
Output
8-bit parallel data output, connect to DATA7~DATA0
25
STB#
OUT
Data strobe output, low-level active, connect to STROBE
4
AFD#
OUT
Automatically feed output, low-level active, connect to
AUTO-FEED



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