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USB bus interface chip CH372 |
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| 1. Introduction |
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CH372 is a USB bus universal device interface chip.It is upgrade production of CH371,and function predigested edition of CH375.At location,CH372 has 8-bit data bus and read strobe input,write strobe input and interrupt output.It is convenient to connect CH372 on controller system bus such as CPU/DSP/MCU/MPU/microprocessors (uPs) and so on.In computer system, the equipped software of CH372 supplies operation interface which is handy and wieldy.When CH372 communicates with local MCU is just like read/write file.
CH372 set up internally lower layer protocol of USB communication.It both has advantageous set firmware up internally mode and flexible set firmware up externally mode.In set firmware up internally mode,CH372 automatically handles with all transaction on default endpoint 0 and local MCU only charges of data conversion,hence the MCU program is very simple.In set firmware externally mode,external MCU deals with various USB requests according to requirements to realize devices in term of various USB analog criterion. |
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●Full-speed USB device interface,complies with Universal Serial Bus Specification Revision 2.0,plug-and-play,only needs crystal and capacitance as peripheral components.
●Supplies a couple of master endpoints and a couple of assistant endpoint,supports control transfer,bulk transfer and interrupt transfer.
●Both has advantageous set firmware up internally mode and flexible set firmware up externally mode.
●In set firmware up internally mode,screens relevant USB protocol,automatically completes standard USB enumerate configuration,totally no needs any process in location controller,simplify firmware program in MCU.
●Universal Windows drive program supplies device layer interface,and supplies API application layer interface via DLL.
●Production venders can self-define Vendor ID and Product ID.
●Universal local 8-bit data bus,4-wire to control:read strobe,write strobe,chip select input and interrupt output.
●The master endpoint upstream and downstream buffer each occupies 64-byte while the assistant endpoint upstream and downstream buffer occupy 8-byte respectively.
●Operation at either +5v or +3.3v power supply input,support low-power mode.
●CH372 is function predigested edition of CH375.It gets rid of some components such as USB host mode and serial communication mode of CH375,so the hardware cost is lower than CH375.But other functions are totally compatible with CH375 and use WDM drive program and DLL Dynamic Link Library of CH375 directly.
●SSOP-20 lead-free package,and compatible with RoHS,pins of CH372 are compatible with CH374T. |
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| 3. Package |
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| 4. Pins |
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CH374DS1.PDF
The DataSheet about CH374
USB-HOST&
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CH375DS1.PDF
The DataSheet of CH375
handy and wi
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