NINA-B50 series - Hardware integration manual
UBX-22021116 - R02
Module integration
Page 10 of 57
C1-Public
2.1.2
DCDC, digital I/O and system input supply (VCC_IO)
NINA-B50 series modules require an additional supply input
VCC_IO
which provides power to the
following internal blocks:
•
DC-DC buck converter: Used for regulating system core and radio power, providing the best power
efficiency.
•
LDO-SYS: A low-dropout regulator for generating the system voltage for the module.
•
Analog domain, including an Analog-to-digital converter (ADC), comparators (CMP) and Voltage
Reference (Vref) parts.
•
Digital I/O interfaces
VCC_IO
must be supplied via either
VCC
or
VOUT_SWITCH
information.
☞
The voltage level of
VCC_IO
must be same as the
VCC
.
2.1.3
VCC application circuits
The power for NINA-B50 series modules is applied through the
VCC
pins. These supplies are taken
from either of the following sources:
•
Switching Mode Power Supply (SMPS)
•
Low Drop Out (LDO) regulator
An SMPS is the ideal design choice when the available primary supply source is significantly higher
than the operating supply voltage of the module. This offers the best power efficiency for the
application design and minimizes the amount of current drawn from the main supply source.
⚠
When taking VCC supplies from an SMPS, make sure that the AC ripple voltage is kept as low as
possible at the switching frequency. Design layouts should focus on minimizing the impact of any
high-frequency ringing.
Use an LDO linear regulator for primary VCC supplies that have a relatively low voltage. As LDO
regulators dissipate power linearly related to the step-down voltage, LDOs are not recommended for
the step down of high voltages.
DC/DC efficiency should be regarded as a trade-off between the active and idle duty cycles of an
application. Although some DC/DC devices achieve high efficiency at light loads, these efficiencies
typically degrade as soon as the idle current drops below a few milliamps. This can have a negative
impact on the life of the battery.
If decoupling capacitors are needed on the supply rails, it is best practice to position these as close as
possible to the NINA-B50 series module. The power routing of some host system designs makes
decoupling capacitance unnecessary.
For electrical specifications, see also the appropriate NINA-B50 series data sheet
2.1.4
Battery
The low current consumption and wide voltage range of NINA-B50 series modules means that a
battery can be used as a main supply. In which case, the capacity of the battery must be selected to
match the application. Ensure that the battery can deliver the peak current required by the module.
For further information about current consumption and other performance data, see also the
electrical specifications in the NINA-B50 series data sheet
