beaglebone-black - Flipbook - Page 63
BeagleBone Black
6.6.7 Power Connections
昀椀gure-46 shows the power connections to the TDA19988 device. All voltage rails for the device are at 1.8V. A
昀椀lter is provided to minimize any noise from the 1.8V rail getting back into the device.
Fig. 6.29: HDMI Power Connections
All of the interfaces between the processor and the TDA19988 are 3.3V tolerant allowing for direct connection.
6.6.8 HDMI Connector Interface
昀椀gure-47 shows the design of the interface between the HDMI Framer and the connector.
The connector for the HDMI interface is a microHDMI. It should be noted that this connector has a di昀昀erent
pinout than the standard or mini HDMI connectors. D6 and D7 are ESD protection devices.
6.7 USB Host
The board is equipped with a single USB host interface accessible from a single USB Type A female connector.
«昀椀gure-48» is the design of the USB Host circuitry.
6.7.1 Power Switch
U8 is a switch that allows the power to the connector to be turned on or o昀昀 by the processor. It also has an
over current detection that can alert the processor if the current gets too high via the**USB1_OC** signal. The
power is controlled by the USB1_DRVBUS signal from the processor.
6.7.2 ESD Protection
U9 is the ESD protection for the signals that go to the connector.
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Chapter 6. Detailed Hardware Design
