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USB bus interface chip CH374 |
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| 1.Introduction |
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CH374 is a USB bus universal interface chip,and supports both USB-HOST and USB-DEVICE/SLAVE mode.There are three ports of HUB internal.It supports low-speed and full-speed control transfer,bulk transfer,interrupt transfer and synchronous/isochronous transfer.On location,there are 8-bit data bus and read,write,chip select control wire and interrupt output in CH374.It is convenient to link CH374 to controller system bus of DSP/MCU/MPU/microprocessors (uPs). Besides,CH374 supplies SPI serial communication mode to save pins.CH374 connects to MCU/DSP/MPU through 3-wire or 4-wire SPI serial and interrupt output. |
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●Supports low-speed of 1.5Mbps and full-speed of 12Mbps,conforms to USB Specification Version 2.0,only needs crystal and capacitor as peripherals.
●Supports USB host interface and USB device interface,and supports exchanging USB-HOST and USB-DEVICE mode dynamically.
●CH374U has 3 ports of ROOT-HUB internal, and supports 3 USB devices.
●Supports control transfer,bulk transfer,interrupt transfer and synchronous/isochronous transfer of USB device with common low-speed and full-speed.
●Automatically detects connection and disconnection of USB device with low-speed and full-speed,and gives out interrupt information.
●Sets impedance matching serial resistor of USB signal wire,pull-up resistor of USB device endpoint and pull-down resistor of USB host endpoint internal.
●Two kinds MCU interface are optional:8-bit passive parallel interface with 6MB and SPI serial interface with 2.7MB/22MHz.
●Parallel interface contains 8-bit data bus,1-bit address wire and 3-wire to control.The control wires are chip select input wire,write strobe wire and read strobe wire which is optional.
●Parallel interface only occupies 2-bit address:index address port and data port.After reading and writing data port,inner index address increases automatically.
●SPI serial interface contains SPI chip select,serial clock,serial input/output,and supports parallel connecting input to output of SPI.
●Interrupt output pin is optional connection,and active with low-level.Detection of interrupt flag in register can replace of interrupt output pin.
●Supplies assistant function:programmable clock output,power-up reset output and optional watchdog reset.
●Supplies USB flash driver file layer subprogram congregation that supports FAT12/FAT16/FAT32 to realize MCU read and write file in USB flash drive.
●Supports source voltage of 5V and 3.3V.
●Supplies SOP-28,SSOP-20,SSOP-24,SOP-16 lead free package which are compatible with RoHS,and DIP28 swap board is also supplied.The pins basically compatible with CH375 and CH372. |
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| 3. Package |
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| 4.Pins |
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CH372DS1.PDF
The English DataSheet about CH372 or
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CH375DS1.PDF
The DataSheet of CH375
handy and wi
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