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2.1.2
High-voltage mode (EVK-NORA-B10 only)
☞
The HV mode switch, SW1, in the schematic is labeled "Module power" on the silk screen.
With the power switch in the ON position, and the HV mode switch in the HV (high-voltage) position,
NORA-B10 is powered by VMODH. The following power signals are active:
• VDD, sourced by 3.3V LDO = debug interface power and reference voltage. Level shifters are used
to allow independent NORA-B1 I/O voltage settings
• VMOD, sourced by NORA-B1 VDD = 1.8 VDC to 3.3 VDC supply output, configured by application
software, and I/O voltage reference for NORA-B10.
• VSYS, sourced by VMOD = EVK system power
• VSHLD, sourced by VSYS = power source for shields connected through the Arduino header, J27
and J9
• VHV, sourced by VBUS_H = power from sources 1 through 4.
• VMODH, sourced by VHV = NORA-B10 VDDH module power input
☞
EVK-NORA-B12 does not support high voltage mode. The HV mode switch is not present.
Figure 2: EVK schematic – power supply
UBX-20030319 - R06
C1-Public
Hardware description
EVK-NORA-B1 - User guide
Page 8 of 31
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