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The DataSheet of CH341 (the first)
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
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
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