Selecting The Evb Power Supply - u-blox EVK-JODY-W3 User Manual

To operate the JODY-W3 EVB, the external power supply source (power mux) and input voltage
levels to the module must be configured using jumpers on the EVB. The power supply tree, including
the jumpers on the EVB, is shown in Figure 8. See also
• J104–J106 configure the EVB power supply source (SDIO, PCIe, USB or external) to the VIN_3V3
domain, which generates the internal power rails for the module.
•
J1-J7 configure the input voltages for the JODY-W3 series module, which can be selected
between the internally generated voltages and the external supplies from J103-J103.
DC-DC converters are used to step-down the external and USB supplies to the power mux and
generate the required input voltages for the module.
Figure 8: JODY-W3 EVB power supply tree

3.3.1 Selecting the EVB power supply

Use jumpers J104–J106 to select the EVB power supply (power mux) for the EVB. Figure 9 shows
the arrangement of external power supply sources for each jumper position.
Figure 9: External power supply selection, J104-J106
VIN_3V3 is the input to the DC-DC converter on the EVB that generates the required voltage rails
(3V3_DCDC, 1V8_DCDC, 3V3_VIO, and 1V8_VIO) for the module, as shown in Figure 8. A single
jumper is connected between VIN_3V3 and the chosen voltage supply to the EVB.
UBX-20030840 - R04
Jumpers and
Board description
EVK-JODY-W3 - User guide
connectors.
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