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MSP430F42x单芯片电子称
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When designing applications for weight， force， torque， and pressure measurement， resistive full-bridge
sensors are widely used. Most of the bridge sensors require a high excitation voltage （typically in the 10-V
range）， while still outputting a rather low， full-scale differential voltage in the range of 2-mV/V excitation
voltage. The output from the sensor is typically amplified by an instrumentation amplifier. After signal
conditioning， the signal is digitized by a high resolution analog-to-digital converter （ADC）。 Typically， such
high resolution ADCs are not integrated in conventional microcontrollers （MCUs）。 A general purpose MCU
is then used for further processing and display.
The conventional approach of using a bridge sensor excitation voltage of 10 V and an Instrumentation
amplifier to achieve a full-scale ADC input voltage increases chip count and complexity of powe
management with high power consumption. An energy-efficient and cost-effective solution is to use a
microcontroller with an integrated high-resolution ADC and integrated programmable gain amplifier （PGA）。
The entire application can then be powered from a 3-V battery. The MSP430F42x has integrated 16-bit
sigma delta ADCs with differential inputs and PGA with gain up to 32. This device offers a single chip
solution for this application with not only high resolution ADCs with PGA， but also LCD driver and
brownout protection.
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