SolidSense N8 BLE Module Variants

Intro

This page documents the two BLE module options used across SolidSense N8 hardware revisions, how they map to SKUs, and the key UART pin differences developers must consider. It also links to the module schematics and provides migration notes between PCB revisions.

Hardware Variants & PCB Revisions

Legacy N8 (PCB ≤ v1.3): populated with u-blox NINA-B1.
Current N8 (PCB v1.4+): populated with Fujitsu FWM7BLZ22.

Both variants are functionally compatible at the system level but differ in BLE module and UART pin mapping.

SKU-to-Module Mapping

SRG40x.01SD (x ∈ {1, 2, 5, 6, 7}) → u-blox NINA-B1
SRG40x.02SD (x ∈ {1, 2, 5, 6, 7}) → Fujitsu FWM7BLZ22
Example:
- SRG0405.01SD — N8 Compact with Wi-Fi, BLE-u-blox, LTE, RS485, CAN, ETH-Atheros
- SRG0405.02SD — N8 Compact with Wi-Fi, BLE-FWM7BLZ22, LTE, PoE, RS485, CAN, ETH-ADIN

Note: “.02SD” SKUs ship FWM7BLZ22 with BLE firmware by default. “.02SW” SKUs (e.g., SRG40x.02SW) ship with Wirepas firmware.

Firmware Options & Defaults

NINA-B1: BLE stack as per u-blox defaults.
FWM7BLZ22:
- .02SD → BLE firmware by default.
- .02SW → Wirepas firmware preloaded. If a different firmware load is required, specify at order time.

UART Pinout Differences (Developer Critical)

Module

UART_0_TX

UART_0_RX

UART_0_RTS

UART_0_CTS

u-blox NINA-B1

N.C.

Fujitsu FWM7BLZ22

N.C.

Legend: N.C. = Not Connected, PD = Pulled Down. Impact: If migrating from NINA-B1 to FWM7BLZ22, update any pin mappings that reference UART0 RX (pin 5 → pin 8).