This application report shows how the ADS1100 16-bit sigma-delta differential A/D converter can be interfaced with the MSP430F413 microcontroller. As an application example, the output of a resistive full-bridge strain gauge sensor is measured and displayed on an LCD.The MSP430F413 device used in this application is a low-cost MCU with integrated LCD driver[3]. It reads the external A/D converter and shows the computed measurement result on an LCDdisplay. The ADS1100 has an I2C interface for connecting to a master device. As the used MSP430F413 controller does not have a hardware I2C communication module, port pins P2.0 and P2.1 have been used to implement an I2C interface. The selection of these port pins is arbitrary, and can be changed by modifying the I2C_Master.h header file. 10-kW pullup resistors are used on the I2C bus lines. Figure 1 shows the application schematic.
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