SolidSense N8 BLE Module Variants
- Yazan Shhady
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 | 6 | 5 | N.C. | PD |
Fujitsu FWM7BLZ22 | 6 | 8 | N.C. | PD |
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).
Schematics & Hardware Resources
NINA-B1 Module Schematic
TX/RX Nordic pin number
UART_TX on pin 6 and UART_RX on pin 5
Fujitsu FWM7BLZ022W Module Schematic
TX/RX Nordic pin number
UART_TX on pin 6 and UART_RX on pin 8
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