CH377F

CH377 is an industrial-grade USB 2.0 high-speed card reader controller chip for connecting SD cards, MMC cards, and SPI-interface FLASH chips, converting these storage media into standard USB mass storage devices (i.e., USB flash drives). The CH377A variant additionally integrates a 3-port USB 2.0 high-speed hub, with an upstream port supporting USB 2.0 high-speed and full-speed, and downstream ports supporting high-speed 480 Mbps, full-speed 12 Mbps, and low-speed 1.5 Mbps. The CH377F variant supports a serial logger mode, capable of receiving serial pass-through data in real time and saving it as files to the storage media. The chip features industrial-grade design, suitable for computer and industrial PC motherboards, docking stations, peripherals, and embedded systems.

Key features

• 480Mbps high-speed USB device interface, requiring only crystal and capacitors as external components
• Supports SD card, MMC card, and SPI-interface FLASH chips
• Compatible with SD card specification 2.0 and MMC specification 4.5
• Single 3.3V power supply
• CH377F supports serial logger mode for real-time saving of serial pass-through data
• CH377F supports FAT file system and parameter configuration via configuration file
• CH377F supports 4-channel GPIO input/output
• CH377F serial communication baud rate: 2400bps ~ 3000000bps
• CH377A supports 3-port USB2.0 hub functionality with 3 USB2.0 downstream ports, compatible with USB1.1 specification
• CH377A hub supports high-performance MTT mode, providing an independent transaction translator per port for full-bandwidth concurrent transfers
• CH377A supports dual-disk functionality: SD card or MMC card as Disk 1, SPI-interface FLASH chip as Disk 2
• CH377A supports 4-wire or 8-wire SDIO mode; CH377F supports 4-wire SDIO mode only
• Built-in EEPROM for configuring VID, PID, maximum current, manufacturer and product information strings, and other parameters
• Available in QFN28 lead-free package, RoHS compliant