CH315H

CH315 ETC

Document overview

• Manufacturer or author: Provided By www.digicamel.com(free datasheet download site)
• PDF pages: 6

Technical content

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. 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. Photic coupler isolator Magnetic coupler isolator Power USB PC Or other USB Host CH315H Upstream UP#=GND CH315H Downstream UP#=VCC USB keyboard USB mice USB Flash Drive /Flash disk USB printer USB collection box USB controller USB Power Power USB PC Or other USB Host CH315G Upstream UP#=GND CH315G Downstream UP#=VCC USB keyboard USB mice USB Flash Drive /Flash disk USB printer USB collection box USB controller USB Long distance Signal transfer Full-speed 75m Low-speed 300m Power Power

The DataSheet of CH315 (the first) 2

• automatically detect USB Full-Speed or USB Low-Speed, CH315H offer USB transfer status indication.
• the same chip can be configured as upstream mode and downstream mode, connect to USB-Host and USB-Device.
• the downstream mode can automatically detect USB device connection and removal, the upstream mode can automatically simulate USB device connection and removal.
• set impedance matching serial resistor of USB signal, pull-up resistor of USB device port, pull-down resistor of USB host port.
• set PLL and 12MHz USB clock internal, no need crystal or crystal resonator, the peripheral circuit is simply.
• set USB signal extension circuit in the CH315G, support category 5 or category 5 unshielded twisted-pair super, the transfer distance is no less than 75m of 12Mbps full-speed USB signal, the transfer distance is no less than 300m of 1.5Mbps.
• set current driven circuit of photic coupler in CH315H, support the low-cost 6N137, the photic coupler can not influenced by electromagnetism.
• only hardware project, real time of USB protocol, no need other drive program, support Windows 98/ME/2000/XP/Vista/Server200X/64bit-Vista and Linux.
• set 3.3V power manostat in the internal. Support 5V power (default) and 3.3V power.
• CH315G adopt SOP-14 lead-free package, CH315H adopt SOP-18 lead-free package, compatible with RoHS. 3. Package Package shape Width of plastic Pitch of pin Instruction of package Ordering type SOP-14 3.9mm 150mil 1.27mm 50mil Small outline package of 14-pin CH315G SOP-18 7.62mm 300mil 1.27mm 50mil Small outline package of 18-pin CH315H 4. Pins CH315G Pin No. CH315H Pin No. Pin Name Pin Type Pin Description 3,9 13,16 VCC POWER Positive power input port, requires an external 0.1uF power decoupling capacitance 2,6 8,17,18 GND POWER Public ground, ground connection for USB 14 3 V3 POWER Attachment of VCC input external power while 3.3V;connects of 0.01uF decoupling capacitance outside while 5V 13 1 UD+ USB signal Directly connect to USB bus D+ data bus

The DataSheet of CH315 (the first) 3 5. Function CH315 can direct use USB power. When using 5V power, V3 pin must connect with about 0.01uF decoupling capacitance. When using 3.3V power, V3 must connect with VCC, and input the outside 3.3V power. CH315G using category 5 or category 5 unshielded twisted-pair super (net wire) or USB signal wire and similar difference signal twisted-pair. If the characteristic impedance is not matching, need to parallel connect resistor to ground of output port XD+/XD-. The transfer distance of CH315G is relative with transfer wire quality. When using common net wire, the transfer distance is no less than 300m of low-speed USB signal, the transfer distance is no less than 75m of full-speed USB signal. The current resistor of common net wire is less than 10Ω/100m. If the current resistor is too big, it will influence on transfer distance, and influence on USB supply power, upgrade ground power of device port. The transfer distance of CH315G has relative with USB host time characteristics of computer chip groups. For full-speed USB signal, the trip acknowledge time of electron in transfer wire does not pass computer waiting time (several ns), so the transfer distance is limited. The ACT# is USB transfer current status output of CH315H, connect with LED to indicate USB 12 2 UD- USB signal Directly connect to USB bus D- data bus

1 No REF Consult

Consult power of internal simulate circuit, require an resistor and decoupling capacitance

5 No XD+ Simulate

signal Directly connect to difference extension wire positive port

4 No XD- Simulate

Directly connect to difference extension wire negative port No 14 OPIP IN Separate transfer P signal input, connect with photic coupler or magnetism coupler P logic output port No 15 OPIN IN Separate transfer N signal input, connect with photic coupler or magnetism coupler N logic output port No 6 OPOP OUT Separate transfer P signal output, connect with photic coupler or magnetism coupler P control input port No 7 OPON OUT Separate transfer N signal output, connect with photic coupler or magnetism coupler N control input port No 5 LSO# OUT USB transfer speed automatically check the result ouput. Low-level is USB low-speed 1.5Mbps, high-level is USB full-speed 12Mbps No 4 LSI# IN USB transfer speed select input, Low-level is USB-low speed 1.5Mbps, high-level is USB full-speed 12Mbps. 10 12 UP# IN Mode select input, with pull-up resistor, Low-level is upstream mode, high-level is downstream mode No 11 ACT# Drain open OUT USB transfer status output, active with low-level, with pull-up resistor 7,8,9 9,10 NC. Un-connect Forbid to connect

The DataSheet of CH315 (the first) 4 transfer. CH315H support the common type 6N137 single channel high-speed photic coupler (need four) or the type is HCPL-2630,2631,0630,0631 double channels (only need two). The isolate power is determined by photic coupler, the typical isolate power is 5000V of 6N137. CH315H also support magnetism coupler, recommended to use photic coupler, not influenced by the electromagnetism. In order to support 12Mbps USB full-speed signal, the transfer speed is more than 10Mbps of photic coupler or magnetism coupler. CH315 is hardware project of USB signal extension and USB signal electric isolation, compatible with the relative criterion, completely transparent to the USB protocol. For the CH315, no need any drive, but the USB device may need to install driver, the method is the same with the no isolation. The common USB Flash Drive, keyboard, mice and other USB device may no need driver. CH315 can automatically detect USB full-speed and USB low-speed, support plug and play, automatically detect and simulate the USB device connect and disconnect. CH315G can be used to produce active USB extension cable, extension USB transmission distance, signal acquisition and on-line remote control; CH315G can be used to produce optical isolator USB signals and reduce signal interference, improve signal acquisition accuracy. 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 6.0 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, excluding pin connection of USB bus) Name Note of parameter Min. Typ. Max. Unit s VCC Power voltage 3.2 5 5.3 V ICCs Static source current 2 5 mA ICCa Source current when working 20 50 mA VIL Input Voltage LOW OPIN/N -0.5 0.8 V VIH Input Voltage HIGH OPIP/N 2.0 VCC+0.5 V VOL Output Voltage LOW (draw 8mA current) OPOP/N 0.5 V VOH Output Voltage HIGH (output 8mA current) OPOP/N VCC-0.5 V IUPup Input current in UP# pin with internal pull-up resistor 3 150 300 uA IUPact Input current in ACT# pin with internal pull-up resistor 100 230 400 uA Lfs Extension distance of full-speed USB signal 75 m Lls Extension distance of low-speed USB signal 300 m 7. Application 7.1. Active USB extension cable (following image) The following USB extension cable is composed by two groups CH315G circuit.

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.

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.