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L.O.U.I.S - LOW COST USB ISDN SOLUTION

STMicroelectronics 

ST5481

7 - POWER MANAGEMENT

The device can be supplied by the USB bus

power lines VBUS (5 volts) and GNDBUS

(ground). This is enabled when RPSM (remote

power supply mode) is at logic one. Then on-chip

regulators bring 3.3 volts to internal analog and

digital blocks. When RPSM is high, a supply is

brought to external devices through pins GNDD1,

VREGD1, GNDD2, VREGD2, GNDA, VREGA.

Figure 4 : Bus-Powered Mode (RPSM=1)

From

USB bus

To other

digital

device

8 RPSM

5 VBUS

3 GNDBUS

4 VREGD1

44 GNDD1

34 VREGD2

Figure 5 : Self Powered Mode (RPSM=0)

From

USB bus

From 3.3V

externally

regulated

supplies

8 RPSM

5 VBUS

3 GNDBUS

4 VREGD1

44 GNDD1

34 VREGD2

35 GNDD2

6 VREGA

7 GNDA

ST 5481

To other

analog

device

35 GNDD2

6 VREGA

7 GNDA

ST 5481

The power budgeting is done by the host when

initializing the pipe:

The needed information (maximum power

consumption) is adjusted through pins CFG0,

CFG1 and as well as RPSM for “remote wake up

ability” information.

The following mechanism is used to do "a get

description device".

7/18

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