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Revision 0.1
OMAP4460 Pandaboard ES
System Reference Manual
September 29, 2011
DOC-21054
The VAUX2 LDO is a programmable LDO that is only connected to pin 1 of the LCD Expansion
Connector J4. Its possible output voltage settings include 1.2V, 1.8V, 2.5V, 2.75V, and 2.8V, and its
maximum output current is 200mA. The voltage to be programmed will be dependent on the board
plugged into the LCD Expansion connectors, but will most likely be 2.8V.
The VAUX3 LDO is a programmable LDO that is only connected to pin 30 of the Camera Expansion
Connector, J17. Its possible output voltage settings include 1.0V, 1.2V, 1.3V, 1.8V, 2.5V, 2.8V, 3.0V,
and its maximum output current is 200mA. The output voltage to be utilized would depend on the
implementation of the camera module.
The VCXIO LDO is a fixed 1.8V, 200mA LDO that provides a 1.8V input to certain noise sensitive
OMAP4460 balls. The balls powered by this LDO include the VDDA_CSI2 balls (V28 and W28), the
VDDA_DPLL balls (G13, P9 and Y16), and on this revision of the Pandaboard ES, the
VDDS_DV_BANK7 ball (M28). This LDO also provides power for the onboard 38.4 MHz oscillator.
The VDAC LDO is a fixed 1.8V, 50mA LDO that provides a 1.8V input to certain noise sensitive
OMAP4460 balls. The balls powered by this LDO include the VDDA_HDMI_VDAC balls (A11 and
G12).
The VMMC LDO is a programmable LDO that provides the voltage to the VDDS_MMC1 balls on the
OMAP processor (pins G7 and H7) as well as the SDMMC cardcage. This LDO is off when the board is
powered on, but is turned on and set to 1.8V or 3.0V depending on card capabilities detected.
The VRTC LDO is an adjustable LDO that provides internal voltages to the TWL6030 device. Its
possible output voltage settings are 1.8V and 2.5V and its maximum output current is 25mA. In normal
operation, it should always be set to 1.8V.
The VUSB LDO is a fixed 3.3V, 35mA LDO that provides voltage to the OMAP4460 that it uses for its
internal USB transceiver. The only ball powered by this LDO is the VDDA_USBA0OTG_3P3V ball
(ball A5).
The VPP LDO is adjustable LDO that powers the VPP_CUST and VPP_STD balls on OMAP (balls J8
and Y22). This LDO is only needed for eFuse operations and can be left disabled for normal Pandaboard
ES operation.
2.5.7
TWL6030 Clock Circuitry
The TWL6030 has an 32.768 KHz crystal connected across its OSC32KIN and OSC32KOUT balls. This
crystal is used by the TWL6030 to generate three output 32.768 KHz, 1.8V square wave clock outputs.
These outputs are:
CLK32KAO: always on clock connected to the SYS32K input of the OMAP4460 processor.
CLK32KAUDIO: clock connected to the CLK32K input of the TWL6040 Audio Companion IC.
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