Datasheet

Functional Description
MC13783 Technical Data, Rev. 3.5
Freescale Semiconductor 45
An ID detector is used to determine if a mini-A or mini-B style plug has been inserted into a mini-AB style
receptacle on the phone. The ID voltage can be read out via the ADC channel ADIN7.
4.5.1.2 RS-232 Interface
In RS232 mode, USBVCC is used for the supply of the interface with the microprocessor. VUSB is used
as the supply for the RS232 transceiver and the drivers at the cable side. In this mode, the USB transceiver
is tri-stated and the USB module IC pins are re-used to pass the RS232 signals from the radio connector
to the digital sections of the radio.
Flexibility is provided for RS232 Rx and Tx signal swapping at the cable side interface pins UDP and
UDM, and the possibility to enable the RS232 receiver while tri-stating the transmitter.
4.5.1.3 CEA-936-A Accessory Support
Support for CEA-936-A is provided, including provision for audio muxing to UDP and UDM and ID
interrupt generation. All audio path switches are residing in the USB block and are powered from the
VUSB regulator. Please refer to CEA-936-A specification for details.
4.5.1.4 Booting Support
The MC13783 supports booting on USB. The boot mode is entered by the USBEN pin being forced high
by the booting equipment which enables the transceiver.
4.5.2 Lighting System
The lighting system of MC13783 is comprised of independent controlled circuitry for backlight drivers
and tri-color LED drivers. This integration provides flexible backlighting and fun lighting for products
featuring multi-zone and multi-color lighting implementations. Figure 12 illustrates the lighting system
utilization for a typical application.