AU9420 - USB Keyboard Controller

The AU9420 is a single chip integrated USB keyboard controller chip.
The USB descriptors and keyboard matrix can be customized via internal 4K bytes of OTP ROM or directly select the internal 4 different models from internal ROM. It also support I2C interface to external EEPROM for key matrix customization.
To minimize BOM cost, the AU9420 integrated all other components typically founded in an USB keyboard including 6MHz oscillator, power-on-reset and a watch dog timer. This single chip integration makes the AU9420 the most cost effective USB keyboard solution available in the market.

Main Features:

• Fully compliant with the Universal Serial Bus Specification - Version 1.1
• USB keyboard design is compliant with USB Device Class Definition for Human Interface Devices (HID) - Version 1.1
• USB Low Speed interface
• Built-in 4K bytes OTP
• Built-in 6MHz oscillator available to reduce BOM cost
• 3 LED direct sink pins
• Built-in power-on reset
• Supported endpoints: Interrupt In, Control
• Remote wakeup provided
• Contains 4 different key matrix in internal ROM
• Built in Watch Dog Timer
• Phantom Key Detection
• Support for 20 x 8 key matrix with 48 pin package and Dies.
• Support individual FN key (not available in 48 pin package)
• USB vendor ID, product ID, and key matrix table can be customized via optional external EEPROM.
• Software features: Modifiable key matrix, device descriptor, modified key matrix can be dumped to excel file, Configuration web key application

Application Diagram: