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Si47xx-EVB
The Si47xx EVB can be powered using one of the following power supply options:
1. USB power supply via J79
2. External dc (Ext DC) power supply via power jack J78 or battery via J77
3. Three separate power supplies (Vdd, Vio, Vmcu) via terminal block J76
The EVB has three supply rails: Vdd, Vio, and Vmcu. Vdd and Vio are routed directly to the daughtercard to power
the Vdd and Vio pins on the Si47xx chip, while Vmcu is used to power the baseboard.
The external dc power supply and battery should not be connected simultaneously. Refer to Section 9. "Using the
EVB with a 9 V Battery?" on page 109 for more information.
USB Power Supply & EXT DC Power Supply
Switch SW1 is used to select between the USB power supply and Ext dc power supply.
The USB power supply or the Ext dc power supply can be configured in one of the following two modes:
1. Fixed +3.3 V
2. Adjustable Vdd and Vio
Fixed +3.3 V
Only one LDO is used in this mode which outputs a +3.3 V supply to all three rails (Vdd, Vio, and Vmcu). The
jumpers need to be set according to Figure 3 to use the EVB in this configuration. This is the default configuration
on the EVB.
Vio
J68
Vdd
J69
Vmcu
J61
Figure 3. Default Fixed +3.3 V Jumpers Setting
Terminal Block Power Supply
If the terminal block supplies are used, then jumpers J61, J68, and J69 need to be set according to Figure 4. The
user then needs to connect three different power supplies for Vdd, Vio, and Vmcu.
Vio
J68
Vdd
J69
Vmcu
J61
Figure 4. Terminal Block Jumpers Setting
10
Rev. 0.8
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