EVK-NORA-B1 - User guide
UBX-20030319 - R06
Hardware description
Page 8 of 31
C1-Public
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