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PDF CH315G Data sheet ( Hoja de datos )
| Número de pieza | CH315G | |
| Descripción | USB extension control chip | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CH315G (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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The DataSheet of CH315 (the first)
1
USB extension control chip CH315G
USB signal isolation control chip CH315H
DataSheet
Version:1A
http://wch.cn
http://wch-ic.com
1. Introduction
CH315G is USB extension control chip, used for USB signal real time transmit and extend transfer
distance.
CH315H is USB signals isolation control chip, used for USB bus optical isolator or magnetic isolator.
CH315 supports full-speed and low-speed transfer, support USB device dynamic insert and remove.
The following is application image.
Power
PC
Or other
USB
Host
USB
CH315G
Power
CH315G
Power
Upstream
UP#=GND
Long distance
Signal transfer
Full-speed 75m
Low-speed 300m
Downstream
UP#=VCC
USB
USB keyboard
USB mice
USB Flash
Drive /Flash
disk
USB printer
USB collection
box
USB controller
PC
Or other
USB
Host
Power
USB
CH315H
Upstream
UP#=GND
Photic coupler
isolator
CH315H
Power
Magnetic
coupler
isolator
Downstream
UP#=VCC
USB
USB keyboard
USB mice
USB Flash
Drive /Flash
disk
USB printer
USB collection
box
USB controller
2. Features
● supports 12Mbps full-speed and 1.5Mbps low-speed USB transfer, compatible with USB 2.0.
● supports USB control transfer, bulk transfer, interrupt transfer, synchronous/isochronous transfer.
1 page  
The DataSheet of CH315 (the first)
5
The upstream contains U3, P3 etc. the up port P3 is used to connect to computer or other USB-Host, U3
etc upstream circuit share power with computer or USB host through P3, at least public ground.
The downstream contains U4, P4 etc, the down port P4 is used to connect to USB-Device, such as USB
keyboard, USB mice, USB Flash Drive, USB data acquisition box, USB controller etc. USB device, U4 etc.
downstream circuit share power with USB device, at least public ground.
There is one group electrical wire between upstream U3 and downstream U4, using common network
cable (category 5 or category 5 unshielded twisted-pair super) connection. The cable included XD+ and XD-
two differential signaling lines and at least one public ground. If there are remaining signal lines, it can also
be used an additional ground wire and power wire.
For the normal eight core cable, please consult to the figure RJ45: two differential signal lines, four
ground wires, two power wires. The power wire can offer +5V source to USB device port, but impact by the
network cable DC resistance of the voltage drop, especially when the USB device draws more current, the
USB device port of the actual supply voltage is usually less than 5V, and even individual USB device may be
unable to work, then need to provide independent power for the downstream.
The capacitance of C11, C12, C14, C15 is from 4700pF to 0.02uF, used to decoupling of internal power.
C13 and C16 is 0.1uF, used to decoupling of power of CH315. C17 is decoupling of the USB device on P4
port. R11 and R12 are used to adjust the internal consult power.
USB port contains P3 and P4, USB bus contain one pair of 5V power wire and one pair of data signal.
Usually, +5V power wire is red, the ground wire is black, D+ signal wire is green, D- signal wire is white.
When designing the PCB, pay much attention to some notes: C11, C12, C13, C14, C15 and C16
connected to the pin as close as possible CH315G, makes sure D+ and D- are parallel, XD+ and XD- are
parallel, and supply ground net or pour copper beside them to decrease the disturbance from outside signal.
7.2. USB signal isolator (following image)
The following USB isolator is composed by two groups CH315H circuit.
LSI# pin directly connect to LSO# pin in CH315H, automatically detect USB speed. In actual, if need
to support certain speed, such as, support low-speed USB keyboard, make LSI# as low-level.
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet CH315G.PDF ] | |
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