NRF52820-QDAA-R datasheet(418/437 Pages) NORDIC

418 / 437 page

Hardware and layout

D, E

D2, E2

Min.

0.80

0.00

0.15

4.90

3.50

0.20

0.30

Nom.

0.85

0.035

0.203

0.20

5.00

3.60

0.40

0.35

Max.

0.90

0.05

0.25

5.10

3.70

0.40

Table 116: QFN40 dimensions in millimeters

7.3 Reference circuitry

To ensure good RF performance when designing PCBs, it is highly recommended to use the PCB layouts

and component values provided by Nordic Semiconductor.

Documentation for the different package reference circuits, including Altium Designer files, PCB

layout files, and PCB production files can be downloaded from the product page for the nRF52820 on

www.nordicsemi.com.

In this section there are reference circuits for QDAA QFN40 package, showing the components and

component values to support on-chip features in a design.

Note: This is not a complete list of configurations, but all required circuitry is shown for further

configurations.

Some general guidance is summarized here:

• When supplying power from a USB source only, VBUS must be connected to VDDH if USB is to be used.

• Components required for DC/DC function are only needed if DC/DC mode is enabled for that regulator.

• USB can be used in any configuration as long as VBUS is supplied by the USB host.

• The schematics include an optional series resistor on the USB supply for improved immunity to

transient overvoltage during VBUS connection. Using the series resistor is recommended for new

designs.

Circuit configurations for QDAA QFN40

Supply configuration

Features that can be enabled for

each configuration example

Config no.

VDDH

VDD

DCDCEN1

USB

Config. 1 USB (VDDH = VBUS)

N/A

Yes

Config. 2 N/A

Battery/Ext. regulator

Yes

Config. 3 N/A

Battery/Ext. regulator

Yes

Config. 4 N/A

Battery/Ext. regulator

Table 117: Circuit configurations

7.3.1 Circuit configuration no. 1 for QDAA QFN40

This section contains a configuration summary, a schematic, and bill of materials table for QDAA QFN40

circuit configuration number 1.

4463_156 v1.0

418

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