DSAI130 57120001-P5 | ABB | MCU embedded system module

Description

DSAI130 57120001-P5 | ABB | MCU embedded system module

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In order to avoid interference between channels, the reference voltage of the DSAI130 57120001-P5 bridge uses a DC-DC isolated power module UA2 for each channel. The resistance value of RA3/RA4/RB2 is selected according to the measurement range of temperature, the gain of SDADC and the selected thermistor. The resistance values in Figure 3 are configured using a gain G= 8x, PT100 thermistor. The temperature range measured by this selection is 0 ° C ~350 ° C. The specific formula derivation can be seen in the design of Wheatstone Bridge. I won’t derive it here.

DSAI130 57120001-P5 Previous multi-channel analog measurements were made using multi-channel ADC chips or multiple single-channel ADC chips. Obviously, the cost of multi-channel ADCs and multiple ADC chips will inevitably increase. The design adopts the mode of single channel high speed ADC+ analog switch. In fact, the multi-channel ADC is also an A, D and C core + a multi-channel analog switch. However, this design scheme has a price advantage over multi-channel ADC. And the isolation is better. The performance of the analog switch can be selected according to isolation requirements. The differential signal A1+/A1 in the analog front end is selected by the analog switch to enter the filtering network of the analog signal to filter out common mode interference. The filtered differential signal is then fed into the SDADC module pin of the STM32F372. The internal 16-bit Sigma-Delta analog-to-digital converter is used to convert the differential signal. See Figure 4 for specific circuit design:

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