This device is a companion chip for microcontrollers to provide USB connectivity with the USB host. Six USB endpoints are supported with 8/8/8/64/8/64-byte FIFO for endpoint 0~5 respectively. An external interrupt output to the host MCU is used for interrupt-driven operation. However, the host MCU may also poll the status register to obtain the latest status if the interrupt is not used.

The possible applications include low-cost data links for computers/peripherals, portable and battery operated devices/instruments, factory automation and process control.

Features:

• Operating Voltage (VDD): 3.3V~5.5V
• I2C pins Voltage (VDDIO): 1.8V~VDD (Less than VDD voltage)
• Fully integrated internal 12MHz oscillator with 0.25% accuracy for all USB modes which requires no external components
• USB interface
  • USB 2.0 Full Speed compatible
  • Implements USB protocol composite device:
    • Communication Device Class (CDC) for communications and configuration
    • Human Interface Device (HID) for user configure USB VID, PID and device description strings
  • Integrated an internal 1.5kΩ pull-high resistor on D+ pin
• Serial Interface -- I2C
  • Supports clock rate up to 400kHz
  • Supports Master and Slave modes decided by AP command
  • Supports maximum 62 bytes transmit buffer and 62 bytes receive buffer
  • Supports SDA (Master mode) and SCL or SDA (Slave mode) pins resume signal to request a remote wake-up
  • Supports VDDIO pin for I2C and A0~A1 pins power supply
• Support standard Windows® drivers for Virtual Com Port (VCP): Windows XP (SP2), Vista, Windows 7, Windows 8, Windows 8.1 (only an INF file is required) and Windows 10
• Support Android 4.0 or later version and Mac OS X
• Integrated 256 bytes internal true EEPROM for user memory
• Power down and wake-up functions to reduce power consumption
• Package types: 8-pin SOP, 10-pin MSOP