NORA-B1 series - System integration manual
UBX-20027617 - R02
System description
Page 8 of 58
C1-Public
1.3
Architecture
1.3.1
Block diagram
Figure 1: NORA-B1 series block diagram
1.3.2
Hardware options
NORA-B1 series modules use an identical hardware configuration except for the different antenna
solutions. An external 32.768 kHz low-frequency crystal can be used if LFCLK accuracy better than
+/-250 ppm is required. DC-DC converters are integrated to provide higher efficiency across operating
modes.
1.3.3
Software options
NORA-B1 series modules are open CPU solutions that allow custom applications to be developed with
the Nordic Semiconductor nRF Connect SDK, which includes the Zephyr Real Time Operating System
(RTOS), MCUboot bootloader, and nrfxdrv drivers for optimizing connected peripheral performance.
1.4
Pin assignments
For information about the function, configuration, and characteristics of module pins, see the
NORA-B1 series data sheet [1].
1.5
Supply interfaces
1.5.1
Main supply input
NORA-B1 utilizes three power inputs,
VDDH
,
VDD,
and
VBUS
. These inputs connect to internal
regulators that provide the application and network core operating voltages, USB subsystem power,
and GPIO voltage references.
In normal voltage mode, a single power source is connected to both
VDDH
and
VDD
. This bypasses
the high voltage regulator (VREGH). The GPIO voltage is equal to the external power source voltage.
