Most weight scales use bridge transducers for precise measurements. The challenge with this implementation is that the output differential signal from the transducer is very small and needs to be amplified before processing. For general MCU control systems, this typically involves using instrumentation amplifiers with high-accuracy ADCs and voltage references. The advantage of the RA2A2 is that it integrates these high-precision analog functions, such as op amps, 24-bit sigma-delta ADC, 16-bit ADCs, and DAC. This enables designers to simplify their design by eliminating external components. It also reduces overall system space and cost, while increasing system reliability. The integration of analog functions in a microcontroller offers interesting ways to create combined analog and digital functions that work together under full user control. This system provides an accurate method for sensing the transducer signal and measuring it with the MCU.

System Benefits:

  • An integrated op amp configuration function
  • 24-bit sigma-delta A/D converter function built into the MCU



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Template 1 CN155 CN155 CN155 Connector double arrow Connector Arrow 4.5V 4.5V 4.5V 1.5V x3 1.5V x3 1.5V x3 Connector Line Battery 3-Cell Sheet.274 Sheet.275 Sheet.276 Sheet.277 Line 1pt.1552 Line 1pt.1608 Sheet.280 Sheet.281 Ground (earth) Sheet.283 Sheet.284 Sheet.285 Sheet.286 3.3V 3.3V 3.3V Connector Line.423 Connector Arrow.424 Connector Arrow.425 Connector Arrow.426 Connector Arrow.427 Connector Arrow.428 Connector Line.431 Connector Line.432 Connector Arrow.435 Connector Arrow.436 LDO LDO LDO Mode Switch Non-Renesas Component Mode Switch Mode Switch Mode Switch SPST NO Switch Sheet.414 Sheet.415 Sheet.416 Sheet.417 Sheet.418 Sheet.419 Battery Voltage Monitor Battery Voltage Monitor Battery Voltage Monitor Weight Sensor Weight Sensor Weight Sensor Connector 1.160 Connector double arrow.438 MCU EP Multi-function block MCU MCU OPA OPA OPA IRQ IRQ IRQ 16-bit ADC 16-bit ADC 16-bit ADC 24-bit ADC 24-bit ADC 24-bit ADC I2C I2C I2C Connector Arrow.440 Non-Renesas Component Sheet.457 Sheet.445 Sheet.446 Sheet.447 Sheet.449 Sheet.450 Line.758 Line.759 OLED Sheet.519 Label Text 10pt.160 (128*64) (128*64) Sheet.521 Sheet.522 Sheet.523 Sheet.524 Sheet.525 Sheet.526 Sheet.527 Sheet.528 Sheet.529 Sheet.530 Sheet.531 Sheet.532 Sheet.533 Sheet.534 Sheet.535 Sheet.536 Sheet.537 Sheet.538 Sheet.539 Sheet.540 Sheet.541 Sheet.542 Sheet.543 Sheet.544 Sheet.545
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