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Korlinx

NX15 FAQ

This page collects common questions for NX15 Series BLE module development.

note

FAQ is the main place for troubleshooting. Other pages should keep only short troubleshooting notes and link back here when deeper explanation is needed.

General​

What is the NX15 Series?​

NX15 Series is a compact BLE module family for low-power IoT and embedded wireless applications.

For a short product overview, see:

Where should I start?​

Start with:

  1. NX15 Overview
  2. NX15 Quick Start
  3. NX15 Hardware Design
  4. NX15 Antenna Design
  5. NX15 Low Power Guide

Hardware Bring-up​

The board does not power on. What should I check?​

Check:

AreaCheck
PowerConfirm VDD_nRF is within the recommended range
GroundConfirm all GND pads are connected
DecouplingConfirm bypass capacitors are placed close to VDD pads
Short circuitCheck for solder bridge or assembly issue
Current limitConfirm the power supply is not current-limited too low

See:

I cannot flash firmware. What should I check?​

Check:

SignalCheck
SWDIORouted correctly and accessible
SWDCLKRouted correctly and accessible
GNDCommon ground between debugger and target
NRESETAccessible and not held low unexpectedly
PowerTarget board is powered correctly

See:

BLE Operation​

The device does not appear in a BLE scanner. What should I check?​

Possible causes:

CauseCheck
Firmware not runningCheck LED, log, or debug session
Advertising not enabledCheck application configuration
Wrong board targetConfirm pin and board configuration
RF issueCheck antenna design and module placement
Power issueCheck supply stability during radio activity

See:

BLE signal is weak. What should I check?​

Check the antenna path first.

VariantCheck
NX15iAntenna keep-out, PCB edge placement, nearby metal, battery position
NX15Eu.FL connector, RF trace, antenna cable, external antenna placement

See:

Low Power​

Current consumption is higher than expected. What should I check?​

Common causes:

CauseCheck
Device not sleepingConfirm firmware enters low-power state
Advertising too oftenIncrease advertising interval if possible
Connection interval too shortAdjust interval based on latency requirement
Debug logs activeReduce or disable logs in release firmware
External sensors activePut sensors into sleep mode
LEDs activeDisable LEDs in low-power mode

See:

Should I optimize hardware or firmware first?​

Both matter, but the practical order is:

  1. Confirm hardware power path is correct.
  2. Confirm firmware can enter sleep.
  3. Disable unused peripherals.
  4. Measure current on real hardware.
  5. Adjust BLE timing and application behavior.

Antenna​

Should I choose chip antenna or u.FL?​

Use the model selection and antenna design pages.

General rule:

OptionUse When
Chip antennaYou need compact design and can follow keep-out requirements
u.FL antennaYou need external antenna placement or better control of antenna position

See:

Can I place metal or battery near the antenna?​

Avoid placing metal, shield cans, batteries, or dense copper near the antenna area. These can reduce range or make RF behavior unstable.

See:

Thread / Matter​

Does NX15 support Matter?​

NX15 can be used for Matter over Thread depending on the selected software stack and firmware configuration.

See:

Should I use BLE, Thread, or Matter?​

It depends on the application.

NeedConsider
Phone connection or local configurationBLE
Low-power mesh networkThread
Smart home interoperabilityMatter over Thread
Existing 802.15.4 ecosystemZigbee or Thread, depending on requirement

Production and Validation​

What should I validate before production?​

At minimum, validate:

AreaCheck
PowerStable supply and expected current
FirmwareCorrect board configuration and reliable boot
BLEAdvertising / connection behavior
AntennaRF performance in final enclosure
Low powerSleep and average current
ProgrammingSWD or production flashing access
AssemblySoldering, handling, and inspection process