NX15 Model Selection
This page helps you select the correct NX15 module variant before starting PCB design.
NX15 variants are mainly selected by two hardware decisions:
- Antenna type
- External Flash requirement
Model Lineup
| Model | Antenna | Flash | GPIO | Typical Use |
|---|---|---|---|---|
| NX15i32 | Chip antenna | 32 Mbit SPI Flash | 25 | Compact design with external Flash |
| NX15E32 | u.FL connector | 32 Mbit SPI Flash | 25 | External antenna design with external Flash |
| NX15i00 | Chip antenna | None | 25 | Compact design without external Flash |
| NX15E00 | u.FL connector | None | 25 | External antenna design without external Flash |
Naming Rule
| Code Part | Meaning |
|---|---|
NX15 | NX15 Series BLE module |
i | Integrated chip antenna |
E | External antenna through u.FL connector |
32 | 32 Mbit SPI Flash |
00 | No external Flash |
Antenna Selection
Choose the antenna type based on product enclosure, PCB layout, and RF validation requirement.
| Option | Use When |
|---|---|
| Chip antenna | You need compact design and can follow antenna keep-out rules |
| u.FL external antenna | You need external antenna placement, enclosure flexibility, or better antenna positioning |
tip
Antenna selection should be decided before PCB layout. Changing from chip antenna to u.FL later can affect PCB placement, enclosure design, and RF validation.
Flash Selection
Choose the Flash option based on firmware and storage requirements.
| Option | Use When |
|---|---|
| 32 Mbit SPI Flash | Application requires external storage or larger firmware/storage margin |
| No external Flash | Application is compact and does not need external Flash |
caution
On Flash models, confirm whether QSPI-related pins are reserved before using them as user GPIO.
Selection Guide
| Requirement | Recommended Direction |
|---|---|
| Smallest antenna integration | NX15i variant |
| External antenna placement | NX15E variant |
| More storage margin | 32 model |
| Simpler design without external Flash | 00 model |
| Maximum GPIO flexibility | Confirm firmware and Flash pin reservation before layout |
| Enclosed product with antenna constraints | Evaluate NX15E with external antenna |
Decision Checklist
Before finalizing the model, check:
| Question | Status |
|---|---|
| Does the final product require chip antenna or external antenna? | ☐ |
| Does the firmware require external Flash? | ☐ |
| Are QSPI-related pins needed as GPIO? | ☐ |
| Is the antenna location compatible with the enclosure? | ☐ |
| Is SWD access available for firmware bring-up? | ☐ |
| Has the selected model been verified on prototype hardware? | ☐ |