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.
● 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.