Description
The TM7711 (or HX710A-compatible) Weighing Sensor Module is a single-channel 24-bit analog front-end designed specifically for high-precision electronic scale systems. It accepts low-level differential signals directly from load cells, strain gauges, and bridge sensors, converting them to serial digital output using Σ-Δ conversion technology with 24-bit no-missing-code performance .
The TM7711 features a gain-programmable front-end and an on-chip digital filter whose notch frequency and output update rate can be adjusted via the communication interface . The HX710A variant, by contrast, has a fixed gain of 128 and includes an on-chip temperature sensor for system compensation . Both operate from a single 2.6V to 5.5V supply with very low power consumption (typical 1.2mA, power-down <1µA) and include a built-in clock oscillator requiring no external components .
Critical limitations: This is an ADC module, not a complete scale. A load cell (separate component) and calibration are required. The 2-wire interface is not standard SPI or I2C—it uses a bit-banged protocol where the number of clock pulses selects the next reading type and rate . Do not connect to a standard SPI bus. Power supply noise directly affects measurement stability; a clean, regulated supply with proper decoupling is essential.
Features
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24-Bit No-Missing-Code Resolution: Precision ADC for weigh scales and bridge sensors .
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Σ-Δ Conversion Technology: Low noise and high accuracy for low-frequency measurements.
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Selectable 10Hz/40Hz Output Rate: 10Hz for stable static weighing; 40Hz for faster response .
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Built-in Clock Oscillator: No external crystal or components required .
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Simple 2-Wire Interface: DOUT and PD_SCK pins; no internal register programming needed .
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Low Power Consumption: 1.2mA typical; <1µA power-down .
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Wide Supply Range (2.6V–5.5V): Compatible with 3.3V and 5V systems .
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Simultaneous 50/60Hz Rejection: Reduces mains interference for stable readings .
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