Decoder addresses automotive-compliant USB device charging systems

Diodes Incorporated has responded to the growing opportunities in pre-installed in-vehicle USB charging, by announcing a highly integrated dual-channel USB Type-C protocol decoder. The DIODES AP43776Q supports USB PD 3.1 SPR and PPS as well as Quick Charge QC5, fast charging protocols. It also supports legacy BC 1.2 and is highly optimised for multi-port automotive USB device charging systems.

The device features a built-in MCU with 12kB of OTP ROM, plus a MTP ROM resource tool. Each PD 3.1 port is fully PPS compliant, providing a 3.3V to 21V output voltage range with 20mV/step and 50mA/step adjustment. They allow independent charging output voltages for greater power usage optimisation.

An I2C interface allows inter-chip communication with DC-DC controllers and converters in the charging system. This simplifies the control loop and reduces overall component costs. Utilising the UART interface, two separate AP43776Q devices mauy be interconnected, so that smart power-sharing may be conducted over all four of their combined USB ports. Besides managing power negotiation attachment procedure, it enables DisplayPort over USB-C by detecting USB Type-C Alternate Mode and driving a fitting USB/DP mux. This helps the carrying of video data over the system’s USB connection.

The device is AEC-Q100 Grade 1 qualified, manufactured in IATF 16949 certified facilities, and PPAP capable. It is provided in a 20-pin W-QFN4040 wettable flank package format (with a 4mm x 4mm footprint).