This application note describes the application of the STOTG04 full-speed USB-OTG transceiver in an audio carkit environment. The paper also illustrates the carkit use and operation, connection between cellular phone and the carkit, physical connection and external circuitry of the STOTG04 required for a correct operation. Proper setup of the internal registers of the STOTG04 needed for audio mode is also described.
This document details the application of the STOTG04 full-speed USB-OTG transceiver within an audio CarKit environment. It explains how to connect a cellular phone to a Car stereo via Mini-AB USB receptacles using either four-wire or five-wire protocols.
The note covers three signaling modes: UART, mono, and stereo. It provides specific instructions on configuring the internal registers of the STOTG04 for audio mode operation, including setting driver directions and interrupt masks to enable hands-free speakerphone functionality.
The interface supports UART mode, mono mode, and stereo mode.
Yes, it supports carkit signaling on both D+ and ID lines to operate with either protocol.
The interface enables phone charging, hands free speakerphone, push-to-talk, stereo playback, and others like telematics.