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CH340 Datasheet(PDF) 4 Page - Jiangsu Haoheng Co., Ltd.

Part No. CH340
Description  USB to serial chip
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Maker  WCH [Jiangsu Haoheng Co., Ltd.]
Homepage  http://wch.cn/
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 4 page
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The DataSheet of CH340 (the first)
4
one high-level stop bit. Supporting odd check/even check/flag check/blank check. CH340 supports common
baud rate: 50,75,100,110,134.5,150,300,600,900,1200,1800,2400,3600,4800,9600,14400,19200,28800,
33600,38400, 56000,57600,76800,115200,128000,153600,230400,460800,921600,1500000,2000000 and so
on. The baud rate error of serial transfer signal is less than 0.3%, and permission baud rate error of serial
receive signal is not less than 0.2%.
In the WINDOWS operation system of computer endpoint, drive program of CH340 can communicate
standard serial interface. So the mostly original serial interface application program is totally compatible,
and without any modify.
CH340 can be used to upgrade the former serial interface peripheral equipment, or add extra serial
interface for computer via USB bus. Supply RS232, RS485, RS422 and other interface via adding level
change device.
Only add infrared transceiver, CH340 can add SIR infrared adapter for computer via USB bus, realize
infrared communication between computer and peripheral equipment which is according to IrDA criterion.
6. Parameter
6.1. Absolute maximum rating (Stresses above those listed can cause permanent damage to the device.
Exposure to maximum rated conditions can affect device operation and reliability.)
Name
Parameter note
Min.
Max.
Units
TA
Ambient operating temperature
-40
85
TS
Storage temperature
-55
125
VCC
Voltage source (VCC connects to power, GND to ground)
-0.5
6.5
V
VIO
The voltage of input or output pin
-0.5
VCC+0.5
V
6.2. Electrical parameter (test conditions: TA=25℃, VCC=5V, exclude pin connection of USB bus)
(The every current parameter must multiply the coefficient of 40% when the power is 3.3V)
Name
Parameter note
Min.
Typical
Max.
Units
V3 doesn’t connect to VCC
4.5
5
5.3
VCC
Source voltage
V3 connect to VCC
3.3
3.3
3.8
V
ICC
Total source current when working
12
30
mA
VCC=5V
0.15
0.2
mA
ISLP
Total source current when
USB suspending
VCC=3.3V
0.05
0.08
mA
VIL
Input Voltage LOW
-0.5
0.7
V
VIH
Input Voltage HIGH
2.0
VCC+0.5
V
VOL
Output Voltage LOW (draw 4mA current)
0.5
V
VOH
Output Voltage HIGH (output 3mA current)
(Output 100uA current during chip reset)
VCC-0.5
V
IUP
Input current with pull-up resistor internal
3
150
300
uA
IDN
Input current with pull-down resistor internal
-50
-150
-300
uA
VR
Restrict voltage when power-up reset
2.3
2.6
2.9
V
6.3. sequence parameter (test conditions: TA=25℃,VCC=5V)
Name
Parameter note
Min.
Typical
Max.
Units
FCLK
Frequency of input clock in XI
11.98
12.00
12.02
MHz
TPR
Reset time of power-up
20
50
mS




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