Brochage
Brochage Amplificateur de cellule de charge HX711
Broches
- MCU side: VCC (2.7–5V), DT/DOUT (data), SCK (clock — NOT I2C, a custom 2-wire protocol), GND
- Load-cell side: E+ / E− (excitation), A+ / A− (channel A signal)
- B+ / B− — second input channel (fixed gain 32)
- Red = E+, black = E−, white = A−, green = A+ on most 4-wire cells
Caractéristiques
| Tension d'alimentation | 2.6–5.5 V |
|---|---|
| ADC resolution | 24 bit |
| Channel A gain | 128 or 64 (±20 mV / ±40 mV full scale at 5 V) |
| Channel B gain | 32 (±80 mV full scale at 5 V) |
| Output data rate | 10 or 80 samples/s (RATE pin; most modules 10) |
| Interface | 2-wire serial (DOUT + PD_SCK), not I2C |
| Supply current | < 1.5 mA normal, < 1 µA power-down |
| Power-down | PD_SCK held HIGH > 60 µs |
| Load cell | 4-wire full Wheatstone bridge |
