BeagleBone System Reference
Manual
Page 7 of 92
5.3.7 A/D Converters......................................................................................................................26
5.3.8 GPIO......................................................................................................................................26
5.3.9 CAN Bus ................................................................................................................................26
5.3.10 TIMERS.............................................................................................................................26
5.3.11 PWM .................................................................................................................................26
6.0 DETAILED BOARD DESIGN.........................................................................................................28
6.1SYSTEM BLOCK DIAGRAM...............................................................................................................28
6.2 PROCESSOR......................................................................................................................................28
6.2.1 Processor Block Diagram......................................................................................................29
6.3 SYSTEM POWER ...............................................................................................................................30
6.3.1 TPS65217B PMIC .................................................................................................................30
6.3.2 5V DC Power Input ...............................................................................................................33
6.3.3 USB Power ............................................................................................................................33
6.3.4 Power Source Selection.........................................................................................................34
6.3.5 Power Consumption ..............................................................................................................34
6.3.6 Power Sequencing .................................................................................................................35
6.3.7 TPS65217B Power Up...........................................................................................................35
6.3.8 Voltage Rails..........................................................................................................................36
6.3.9 Power Indicator LED ............................................................................................................37
6.3.10 Expansion 3.3V LDO ........................................................................................................38
6.4 CURRENT MEASUREMENT................................................................................................................38
6.4.1 SYS_5V Connection...............................................................................................................38
6.4.2 SYS_VOLT Connection..........................................................................................................39
6.4.3 MUX_OUT Connection .........................................................................................................39
6.4.4 Current Calculation...............................................................................................................39
6.5 TWO PORT USB HUB......................................................................................................................40
6.5.1 Processor USB Port...............................................................................................................40
6.5.2 HUB Power ...........................................................................................................................40
6.5.3 Crystal and Reset...................................................................................................................41
6.5.4 FT2232H Serial Adapter .......................................................................................................41
6.5.5 Processor USB Port...............................................................................................................41
6.6 FT2232H USB TO SERIAL ADAPTER ...............................................................................................42
6.6.1 EEPROM...............................................................................................................................42
6.6.2 JTAG......................................................................................................................................43
6.6.3 Serial Port .............................................................................................................................43
6.7 256MB DDR2 MEMORY .................................................................................................................43
6.7.1 DDR 2 Design........................................................................................................................44
6.7.2 DDR VTP Termination Resistor ............................................................................................45
6.7.3 User LEDs .............................................................................................................................45
6.8 10/100 ETHERNET............................................................................................................................46
6.8.1 Ethernet PHY Design.............................................................................................................46
6.8.2 Processor Signal Description................................................................................................47
6.8.3 Clocking Mode.......................................................................................................................48
6.8.4 PHY Mode .............................................................................................................................48
6.8.5 MDIO Interface .....................................................................................................................49
6.8.6 PHY Reset..............................................................................................................................49
6.8.7 Status LEDs ...........................................................................................................................49
6.8.8 Power.....................................................................................................................................49
6.9 USB HOST .......................................................................................................................................50
6.9.1 USB Host design....................................................................................................................50
6.10 SD CONNECTOR..........................................................................................................................51
6.11 EEPROM....................................................................................................................................51
6.12 ADC INTERFACE.........................................................................................................................53
6.12.1 ADC Inputs .......................................................................................................................53
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