Belkin XM Commander Spezifikationen PDF herunterladen (Seite 59)

REF: BB_SRM_xM BeagleBoard-xM System

Reference Manual

Revision A2

Page 59 of 164

8.8.4 VDD_SIM

This voltage regulator is a programmable, low dropout, linear voltage regulator supplying

the bottom 4 bits of the 8 bit SD/MMC card slot. The VSEL field

(VSIM_DEDICATED[3:0]) can be programmed to provide output voltage of 1.0 V, 1.2

V, 1.3 V, 1.8 V, 2.8 V, or 3.0 V and can deliver up to 50mA. The default output voltage

of this LDO as directed by the TPS65950 boot pins is 1.8V.

8.8.5 VMMC2

The VMMC2 rail uses the VMMC2.OUT rail from the TP65950. VMMC2 is adjustable

from 1.85 to 3.15V and can deliver up to 100mA of current. VMMC2 is provided as an

auxiliary voltage rail on P17, the Auxiliary Access Header. The proper setting of this rail

is determined by the application and the HW supplied that connects to P17.

8.8.6 VDD_VMMC1

The VMMC1 LDO regulator is a programmable linear voltage converter that powers the

MMC1 slot and includes a discharge resistor and overcurrent protection (short-circuit).

This LDO regulator can also be turned off automatically when the MMC card extraction

is detected. The VMMC1 LDO is powered from the main VBAT rail. The VMMC1 rail

defaults to 3.0V as directed by the TPS65950 boot pins and will deliver up to 220mA. It

can be set to 3.0V in the event 3V cards are being used.

8.8.7 CAM_2V8

This rail powers the optional camera module and uses the VAUX4.OUT rail from the

TPS65950. VAUX4 is adjustable from .7 to 2.8V and can deliver up to 200mA of power.

This railed should be set to 1.8V for proper operation of the camera module. See the

camera module section for more information.

8.8.8 CAM_1V8

This rail powers the optional camera module and uses the VAUX3.OUT rail form the

TPS65950. VAUX4 is adjustable form 1.5 to 2.8V and can deliver up to 100mA of

power. This railed should be set to 1.8V for proper operation of the camera module. See

the camera module section for more information.

8.8.9 USB_1V8

The VAUX2 LDO regulator is a programmable linear voltage converter that powers the

1.8V I/O rail of the USB PHY and includes a discharge resistor and overcurrent

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Belkin XM Commander Spezifikationen Seite 59