Mining Helmet App Prototype
Thought for 1 min 50 sec
Based on Flux knowledge‐base guidance for “designing board-to-board connectors,” your 6-pin, 2.0 mm pitch SMT connector should carry power, ground and your RS-485 bus. On the sensor board you have J1; on the main board you’ll place the mating 6-pin 2.0 mm connector (e.g. the same 2.0-A-6PWB footprint as J2). Wire pins 1–4 for the bus and leave 5–6 as no-connect or future use:
• On both boards tie pin 1 to your VCC_3V3 net and pin 2 to GND.
• Route the differential pair (pins 3/4) as a controlled-impedance RS-485 bus.
• Pins 5–6 may be left unconnected or reserved for future I²C/UART/interrupt lines.
• Route the differential pair (pins 3/4) as a controlled-impedance RS-485 bus.
• Pins 5–6 may be left unconnected or reserved for future I²C/UART/interrupt lines.
Let me know if you’d like to assign those spare pins to I²C (SDA/SCL) or a UART channel next.
I'd like to reserve pins 5/6 for UART TX/RX: @library find a 3.3 V bidirectional level shifter in SOT-23.
Thought for 1 min 22 sec
Here are the top 2 SOT-23 bi-directional level shifters suitable for 3.3 V UART TX/RX:
Table
| Part | Description | Key Specs | Datasheet |
|---|---|---|---|
| SN74LVC1T45DBVT | 1-channel, 420 Mbps bidirectional translator | SOT-23-6, VCCA 1.2–3.6 V, VCCB 1.65–5.5 V | |
| TXS0101DBVR | 1-channel, 24 Mbps bidirectional translator | SOT-23-6, VCCA 1.2–3.6 V, VCCB 1.65–5.5 V |
Recommendation:
- SN74LVC1T45DBVT
- Very high-speed (420 Mbps) so it easily handles UART baud rates up to several Mbps.
- Wide VCCA range down to 1.2 V if you reuse it in other parts of the system.
- TXS0101DBVR
- Lower max data rate (24 Mbps) but still adequate for typical UART (<1 Mbps).
- Slightly higher unit cost but broadly available.
Choose SN74LVC1T45DBVT for headroom if you ever bump UART speeds above 1 Mbps. Let me know which one to add to your sensor-board schematic (pins 5/6 → TX/RX).
Choose SN74LVC1T45
Choose TXS0101DBVR
Add decoupling cap
Confirm pin mapping
