WCH CH374T

CH374 is a universal interface chip for USB bus, supports USB-HOST mode and USB-DEVICE/SLAVE mode, has 3-port root HUB, supports low-speed and full-speed control transmission, bulk transmission, interrupt transmission and synchronous/isochronous transmission. At the local side, CH374 has an 8-bit data bus, a read, write and chip selection control line and an interrupt output, and can be easily hooked to the system bus of DSP/MCU/MPU and other controllers. In addition, CH374 also provides SPI serial communication mode saving I/O pins, being connected with DSP/MCU/MPU through 3-line or 4-line SPI serial interface and interrupt output.

• Support 1.5Mbps low-speed and 12Mbps full-speed USB communication, compatible with USB V2.0; only capacitors are required for peripheral components.
• Support USB-HOST interface and USB-Device interface, and support dynamic mode switching between HOST and DEVICE.
• CH374F/U chip has 3-port USB ROOT-HUB, and can connect and manage 3 USB devices simultaneously.
• Support commonly used low-speed and full-speed USB device control transmission, bulk transmission, interrupt transmission and synchronous/isochronous transmission.
• Automatically detect the low-speed and full-speed connection and disconnection of USB device, and provide interrupt notifications for device connection and disconnection.
• The USB signal line impedance matching series resistance, pull-up resistor at the USB device terminal and pull-down resistor at the USB host terminal are provided internally.
• Two MCU interfaces are optional: 6MB 8-bit passive parallel interface and 3.5MB/28MHz SPI serial interface.
• The parallel interface contains an 8-bit data bus, a 1-bit address, and a 3-wire control: chip selection input, write strobe and optional read strobe.
• The parallel interface only occupies two address bits: index address port and data port. The internal index address automatically increases after the data port is read and written.
• The SPI serial interface includes SPI chip selection, serial clock, serial input and output, and SPI output and input can be connected in parallel.
• The interrupt output pin is an optional connection and is active at low level. It can be replaced by querying the interrupt flag bit in the register.
• Provide miscellaneous function: programmable clock output, power on reset output and optional watchdog reset.
• Provide USB flash disk file level subroutine library supporting FAT12/FAT16/FAT32 file system, achieving USB flash disk file read and write by MCU.
• Support supply voltages of 5V, 3.3V and 3V.
• Provide QFN-28, SSOP-24, SOP-16, SOP-28 and SSOP-20 lead-free package, be compatible with RoHS, provide DIP28 conversion board, and pins are basically compatible with CH375 and CH372.