BSM3 hydrogen alarm module
A 20 × 20 mm PCB module with a 3.3 V GPIO alarm output.
- Alarm setpoint
- 500 ppm H₂
- Typical current
- <100 µA
- Module size
- 20 × 20 mm
Module specifications
| Alarm setpoint | 500 ppm H₂, set by TIPS before shipment |
|---|---|
| Factory test | Alarm ≤30 s at 4000 ppm H₂ |
| Calibration | Each module calibrated before shipment |
| Sampling rate | ≥0.5 Hz |
| Standard | Push-pull GPIO, 3.3 V: High when alarm is active, Low when inactive or cleared |
|---|---|
| Project options | UART or CAN — project development and validation required |
| Supply | 5 V |
|---|---|
| Current | <100 µA (typical) |
| Size | 20 × 20 mm |
| Supply format | PCB module, without enclosure |
| Temperature | -10 to 50 °C |
|---|---|
| Humidity | 20–80% RH, non-condensing |
| Damp heat test | 85 °C / 85% RH, 1,000 h |
|---|---|
| Result | Alarm function normal, no recalibration required |
| Source | TIPS internal test |
Pinout
Standard integration uses the five pins on the right edge.
1 · +5 V2 · Heartbeat3 · Alarm4 · Mode5 · GND| 1 · Top | +5 V supply |
|---|---|
| 2 | Heartbeat output |
| 3 | Alarm output (3.3 V GPIO, active high) |
| 4 | Mode — details provided with the datasheet |
| 5 · Bottom | GND |
Left-edge pads are for programming, debug and serial access, and are not used in standard integration.
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