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CH315G Schematic ( PDF Datasheet ) - ETC

Teilenummer CH315G
Beschreibung USB extension control chip
Hersteller ETC
Logo ETC Logo 




Gesamt 6 Seiten
CH315G Datasheet, Funktion
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.






CH315G Datasheet, Funktion
The DataSheet of CH315 (the first)
6
The upstream contains U1, P1 etc. the up port P1 is used to connect to computer or other USB-Host, U1
etc upstream circuit share power with computer or USB host through P1, at least public ground.
The downstream contains U2, P2 etc, the down port P2 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, U2 etc.
downstream circuit share power with USB device, at least public ground.
There is one group signal isolator circuit between upstream U1 and downstream U2, select magnetic or
optical isolation. The image id optical isolation, the signal isolation is composed by O1+O2 and O3+O4 two
pairs of photic coupler and associated resistance R1~R8, capacitor C7~C10. The type of photic coupler can
select single channel 6N137 or double channels HCPL2631 etc. high-speed photic coupler may require
decoupling capacitors between power pin and ground pin, the figure is not drawn). Used in 12Mbps
full-speed USB signal, need to consider the speed and the speed symmetry, influence on signal slow-moving
and balance, recommended to select the transmission rate is greater than 10Mbit, and adjust the R1/C7,
R2/C8, R5/C9, R6/C10, to optimize the output signal between rising edge and falling edge.
L1 indicates the USB data transfer in progress. The capacitance of C1 and C4 is from 4700pF to 0.02uF,
for Ch315H decoupling the internal power node, C2 and C5 has a capacity of 0.1uF, for Ch315H chip power
supply decoupling.
When designing the PCB, pay much attention to some notes: decoupling capacitors C1, C2, C4 and C5
connect to the pin as close as possible CH315H, makes sure D+ and D- are parallel, and supply ground net or
pour copper beside them to decrease the disturbance from outside signal.

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