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PDF CH341A Data sheet ( Hoja de datos )
| Número de pieza | CH341A | |
| Descripción | USB bus convert chip | |
| Fabricantes | ETC | |
| Logotipo |  |
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 1. EEPROM Flash BIOS USB Programmer  Hay una vista previa y un enlace de descarga de CH341A (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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The DataSheet of CH341 (the first)
1
USB bus convert chip CH341
English DataSheet
Version:2D
http://wch.cn
http://wch-ic.com
1. Introduction
CH341 is a USB bus convert chip, providing UART, printer port, parallel and synchronous serial with
2-wire or 4-wire through USB bus.
In UART mode, CH341 provides alternant rate control signals such as serial transfer enable, serial
receive in ready etc. It also supplies common MODEM communication signal in order to expand UART for
computer or upgrade common synchronous interface device to USB bus directly.
In printer port mode, CH341 supplies standard USB printer port which compounds USB relevant
protocol and Windows operate system used to upgrade ordinary parallel printer to USB bus directly.
In parallel mode, CH341 gives out 8-bit parallel in EPP or MEM mode. It can be used to input/output
data directly without MCU/DSP.
Besides, CH341A also supports some common synchronous serial such as 2-wire (SCL, SDA) and
4-wire (CS, SCK/CLK, MISO/SDI/DIN and MOSI/SDO/DOUT) interface.
Computer
and other
USB host
D+
D-
CH341
Convert chip
UART/RS232/RS485/RS422
Parallel printer to USB printer
EPP parallel and MEM parallel
Common 2-wire and 4-wire synchronous serial
2. Features
2.1.Introduction
● Full speed USB device interface, conforms to USB Specification Version 2.0, only needs crystal and
capacitance external.
● Optional: define Vender ID, production ID and list number through external low-cost serial EEPROM.
● Supports 5V and 3.3V power source.
● Low-cost, directly convert serial peripheral equipment, parallel printer and parallel peripheral
equipment.
● SOP-28 and SSOP-20 package lead free, compatible with RoHS.
● Only compatible with application layer because interfaces are diverted via USB.
Free Datasheet http://www.Datasheet4U.com
1 page  
The DataSheet of CH341 (the first)
26 INI#
OUT
3
SIN#
Tri-state
Output
5 ERR#
IN
8 SLCT
IN
6 PEMP
IN
7 ACK#
IN
27 BUSY
IN
5
Initialize printer, low-level active, connect to INIT
Select printer, low-level active, connect to SELECT-IN
Error with printer, low-level active, with pull-up resistor,
connect to ERROR or FAULT
Printer is selected, high-level active, with pull-up resistor,
connect to SELECT or SLCT
Printer is short of papers, high-level active, connect to
PEMPTY or PERROR
Printer data receive answer, active with rising edge, with
pull-up resistor, connect to ACK
Printer is busy, high-level active, with pull-up resistor, connect
to BUSY
4.5.Parallel mode pins
341A
Pin No.
Pin Name
Pin Type
22~15
D7~D0
Bi-directional
tri-state
25 WR#
OUT
4 DS#
OUT
26 RST#
OUT
3
AS#
Tri-state
Output
27 WAIT#
IN
7 INT#
5 ERR#
8 SLCT
6 PEMP
IN
IN
IN
IN
Pin Description
8-bit bi-directional data bus, with pull-up resistor
EPP mode: indicate write operation, write with low-level,
read with high-level
MEM mode: write strobe output WR#, low-level active
EPP mode: data operation select, low-level active
MEM mode: read strobe output RD#, low-level active
Reset output, low-level active
EPP mode: address operation strobe, low-level active
MEM mode: address wire output ADDR or A0
CH341A: request to wait, low-level active, with pull-up
resistor
Interrupt request input, active with rising edge, with
pull-up resistor
Self-define common input, with pull-up resistor
Self-define common input, with pull-up resistor
Self-define common input, with pull-up resistor
4.6.Synchronous serial interface pins
Pin No.
Pin Name
341A 341H
Pin Type
22 17
DIN
IN
21 16
DIN2
IN
20 15
DOUT
Tri-state
Output
19 14
DOUT2
Tri-state
Pin Description
4-wire serial data input, with pull-up resistor
5-wire serial data input 2,with pull-up resistor
4-wire serial data output, other name is MOSI or SDO
5-wire serial data output 2
Free Datasheet http://www.Datasheet4U.com
5 Page 
The DataSheet of CH341 (the first)
11
7. Application
7.1. Basic connection (consult following picture)
P3 is USB endpoint, USB bus contains a double 5V source wires and a double data signal wires.
Usually, the +5V source wire is red while connects to ground wire is black. D+ signal wire is green, D-
signal wire is white. The source current is up to 500mA supplied by USB bus. Generally, CH341 and other
low-cost USB productions can use 5V source directly. If USB productions supply common power by other
mode, CH341 need to use the common power. If these productions use other common power and USB bus
power at the same time, connects 5V power wire of USB bus to 5V common power of USB productions via
1Ω resistance. And join ground wire of the two power devices.
C13 and C14 are monolithic or high frequency ceramic capacitances. The capacity of C13 varies from
4700pF to 0.02uF, eliminates the coupling of inner power of CH341. The capacity of C14 is 0.1uF,
eliminates the coupling of external power. The crystal X3、capacitance C11 and C12 are composed of clock
oscillating circuit of CH341. Frequency of X3 is 12MHz. C11 and C12 are monolithic or high frequency
with capacity of 15pF~30pF capacitances.
If USB production use USB bus power and parallel connects capacitance C15 between VCC and GND,
the process of power-up is slow and release power is not in time when cut power, so the CH341 reset is not
credible. Over connects a 0.1uF or 0.47uF capacitance C26 between RSTI and VCC to delay reset time is
recommended.
When designing the PCB, pay much attention to some notes: decoupling capacitance C13 and C14 must
keep near to connection pin of CH341; makes sure D+ and D- are parallel and supply ground or covering
copper besides to decrease the disturb from outside signal; the relevant signal leads between XI and XO
must be kept as short as possible. In order to lessen the high frequency clock disturb outside, setting ground
wire on the circle or covering copper to the relative equipments.
LED L1 and limited current resistance R1 are optional components and can be omit. External serial
EEPROM configuration chip U3 is optional equipment, when it is omitted, connects SCL and SDA to select
chip function.
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CH341A.PDF ] | |
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