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REF: BB_SRM_xM BeagleBoard-xM System
Reference Manual
Revision A2
Page 103 of 164
U4B Processor
GPIO_149
AA9
GPIO_150
W8
HUB_3V3
USB ACTIVE
DC_5V_USB
R136
330
GRN
D14
LTST-C190GKT
U16_FB
R111
56.2K,1%
R113
32.4K,1%
U16
TL1963A
IN
2
SHDN
1
OUT
4
ADJ
5
GND
3
GND
6
C177
4.7uF,6.3V,0603
GRN
D12LTST-C190GKT
VBAT
R64 330
R40
330
R39 330
VBAT
VBAT
GRN
D6
LTST-C190GKT
47k
10k
Q1B
RN1907
4 3
5
47k
10k
Q1A
RN1907
1 6
2
USER1
USER0
GRN
D7
LTST-C190GKT
R130
10K
U19
TPS3803G15
NC
1
GND
2
RSET
3
VDD
4
SENSE
5
GRN
D13
LTST-C150CKT
VOLTERR_R
VOLT_ERR
DC_IN
VOLTDETVOLTDET
R121
510
47k
10k
Q2A
RN1907
1 6
2
DC_IN
R12
330
AUX_3V3
GRN
D5
LTST-C190GKT
U18A SN74LVC2G06DCKR
1
2 5
6
VIO_1V8
POWER
U2
TPS2141PWP
LDO_IN
4
LDO_EN
6
SW_IN
2
GND
7
LDO_PLDN
10
LDO_OUT
11
ADJ
9
LDO_PG
8
SW_OUT
12
SW_PLDN
14
SW_PG
1
SW_EN
5
SW_IN
3
SW_OUT
13
PPAD
15
VBAT
R8
10K
U7A TPS65950
LEDA/VIBRA.P
F15
LEDB/VIBRA.M
G15
LEDGND
F16
GPIO.1
N12
Figure 49. Indicator Design
8.22.1 Power Indicator
This indicator, D5, connects from the 3.3V rail supply and ground. It indicates that the
entire power path is supplying the power to the board. Indicator D5 does not indicate
which power source is being used to supply the main power to the board but only that it is
active. Software does have the ability to turn off this regulator and thereby turning off the
LED. By default this is always disabled on power up.
8.22.2 PMU Status Indicator
This output is driven from the TPS65950 using the LED.B output. The TPS65950
provides LED driver circuitry to power two LED circuits that can provide user indicators.
The first circuit can provide up to 160 mA and the second, 50 mA. Each LED circuit is
independently controllable for basic power (on/off) control and illumination level (using
PWM). The second driver, LED.B, is used to drive an LED that is connected to the
VBAT rail through a resistor.
The PWM inside the TPS65950 can be used to alter the brightness of the LED if desired
or it can be turned on or off by the processor using the I2C bus. The PWM is
programmable, register-controlled, duty cycle based on a nominal 4-Hz cycle which is
- BeagleBoard-xM Rev A2 1
- System Reference Manual 1
- Table of Contents 5
- Figures 9
- Tables 11
- 1.0 Introduction 13
- 2.0 Change History 15
- 2.2.2 Software Changes 16
- 4.0 BeagleBoard Overview 17
- Figure 2. USB Y-Cable 21
- 6.0 Product Contents 28
- 7.0 BeagleBoard Hookup 30
- BEAGLEBOARD 36
- VOLT_ERR 45
- 8.2.1 Detection 46
- 8.2.2 Indication 46
- 8.2.3 Shutdown 46
- USB_CLIENT / 47
- OTG PORT 47
- DC_POWER 47
- 8.3.1 USB DC Source 48
- 8.3.2 Wall Supply Source 48
- 8.3.3 DC Source Control 48
- 8.3.4 AUX 3.3V Supply 49
- Figure 25. Main Power Rails 55
- 8.7.6 VOCORE_1V3 56
- 8.7.7 VDD2 56
- 8.8.1 VDD_PLL2 57
- 8.8.2 VDD_PLL1 58
- 8.8.3 VDAC_1V8 58
- 8.8.10 EXP_VDD 60
- 8.9.1 Boot Configuration 60
- 8.9.2 RTC Backup Battery 60
- 8.9.3 Power Sequencing 61
- Figure 27. Power Sequencing 61
- 8.9.4.3 User Reset 63
- 8.9.4.4 PWRON 63
- 8.9.5 mSecure Signal 63
- 8.10.1 Overview 64
- 8.10.2 SDRAM Bus 65
- 8.10.3 GPMC Bus 65
- Processor 66
- 8.10.9 GPIO Mapping 69
- 8.10.10 Interrupt Mapping 69
- Figure 33. POP Memory 70
- Figure 34. System Clocks 70
- 8.12.1 32KHz Clock 71
- 8.12.2 26MHz Clock 71
- 8.12.2.1 26MHz Source 71
- 8.12.2.2 TPS65950 Setup 71
- 8.12.2.3 Processor 26MHz 71
- 8.12.3 McBSP_CLKS 72
- 8.13.1 USB OTG Overview 72
- 8.13.2 USB OTG Design 73
- Figure 35. USB OTG Design 73
- 8.13.3 OTG ULPI Interface 73
- 8.13.3.2 TPS65950 Interface 74
- 8.13.4 OTG Charge Pump 74
- 8.13.5 OTG USB Connector 75
- 8.13.6 OTG USB Protection 75
- 8.14.1 Power 76
- 8.14.2 HS USB PHY 77
- Figure 38. USB PHY Design 78
- 8.14.3 USB HUB 79
- Figure 39. USB HUB Design 80
- 8.14.4 USB Port Connectors 81
- 8.14.5 Ethernet 82
- 8.15.1 microSD Power 83
- 8.15.2 Processor Interface 83
- 8.15.3 Card Detect 84
- Figure 43. Audio Circuitry 85
- 8.16.3 Audio Output Jack 86
- 8.16.4 Audio Input Jack 86
- Figure 44. DVI-D Interface 87
- 8.17.2 LCD Power 89
- 8.17.3 TFP410 Power 89
- 8.17.4 TFP410 Framer 89
- 8.17.6.8 DVI to VGA 93
- Table 16. P11 LCD Signals 93
- Table 17. P13 LCD Signals 94
- 8.20.4 Camera Modules 100
- Figure 47. Camera Modules 100
- 8.21.1 Processor Interface 101
- 8.21.2 Level Translator 101
- 8.21.3 RS232 Transceiver 102
- 8.21.4 Connector 102
- 8.22.1 Power Indicator 103
- 8.22.2 PMU Status Indicator 103
- Figure 49. Indicator Design 103
- 8.22.3 User Indicators 104
- 8.22.4 HUB Power Indicator 104
- Figure 50. JTAG Interface 105
- 8.23.1 Processor Interface 105
- Table 21. JTAG Signals 105
- 8.23.2 JTAG Connector 106
- 8.24.1 Processor Interface 106
- 8.24.2 Expansion Signals 108
- 8.24.3 Power 109
- 8.24.4 Reset 109
- 8.24.5 Power Control 109
- Table 24. P11 GPIO Signals 110
- MUX:0 MUX:2 MUX:4 110
- Table 25. P13 GPIO Signals 110
- 8.26.1 MCBSP5 Signals 111
- 8.26.2 MMC3 Signals 112
- 8.26.3 ETK Signals 112
- 8.26.4 HSUSB1 Signals 113
- 8.26.5 Alternate Clock 113
- 8.26.6 HDQ 1-Wire 113
- 8.26.7 ADC 113
- 8.26.8 GPIO Signals 114
- 8.26.9 DMAREQ 114
- Figure 52. Power Connector 115
- Figure 56. DVI-D Connector 118
- DVI-D interface itself 118
- Figure 57. DVI-D Cable 119
- Figure 58. DVI-D Cable 119
- 9.5.1 Connector Pinout 120
- Table 33. P11 LCD Signals 120
- Table 34. P13 LCD Signals 121
- 9.5.2 Camera 122
- Figure 60. Camera Connector 123
- Figure 61. Camera Module 123
- 9.5.3 Audio McBSP2 Port 124
- 9.5.6 Mounting Scenarios 127
- Figure 66. Audio In Plug 128
- Figure 68. Audio Out Plug 129
- Table 39. JTAG Signals 130
- 9.9.1 Battery 132
- Figure 73. Optional Battery 132
- 9.9.2 Battery Installation 132
- Figure 75. Resistor R65 133
- Table 41. DC Power Supplies 135
- Figure 76. DC Power Supply 135
- Figure 79. USB to Bluetooth 138
- 11.0 Mechanical Information 140
- 11.2.1 Mounting Method 141
- 11.2.2 Expansion EEPROM 143
- Table 46. Voltages 145
- 12.1.1 Signal Access Points 146
- Table 47. Troubleshooting 147
- 13.0 Known Issues 148
- 15.0 Schematics 151
- 16.0 Bills of Material 163
- 17.0 PCB Information 164
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