EVK-R41Z - User guide
UBX-19033357 - R03
Hardware description
Page 8 of 23
2.2.1
Power configuration switch
The power configuration switch allows easy and quick adjustment of most power settings on
the R41Z evaluation board.
Figure 4: Power configuration switch
SW position Default (SW position off)
Option (SW position on)
1
Bypass Power Mode
DC-DC Power Mode. Buck Mode by default; Boost
mode selectable with Power Configuration
Jumpers. See DC-DC Mode Selection.
2
PSWITCH OFF. When in Buck Mode, the DC-DC
converter will not start when power is applied.
Use this option when using Bypass Mode.
PSWITCH ON. When in Buck mode, the DC-DC
converter will automatically start when power is
applied. Use this option when using Boost Mode.
3
Regulator On. When USB is connected, the LDO
regulator will supply power to the evaluation
board.
Regulator Off. When USB is connected, the LDO
regulator will not supply power.
4
Regulator 3.6 V. When USB is connected, the
LDO regulator will output 3.6 V. With the reverse
protection diode, 3.3 V is applied to the R41Z.
Regulator 1.8 V. When USB is connected, the LDO
regulator will output 1.8 V. With the reverse
protection diode, 1.5 V is applied to the R41Z.
Useful for using Boost mode.
Table 3: Power configuration switch options
2.2.2
DC-DC mode selection
For details regarding the electrical connections required to implement each power mode,
please reference the R41Z evaluation board Schematic and R41Z Module Data Sheet. These
documents are available online at the u-blox website.
Switching between Bypass Mode and Buck mode can be accomplished using the Power
Configuration Switch. To use Boost Mode there are other changes that must be made through
the power configuration jumpers, summarized below.
Figure 5: Power configuration jumpers (Default)
