How does the max31865 resistance to digital converter work?
The MAX31865 is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets the sensitivity for the RTD being used and a precision delta-sigma ADC converts the ratio of the RTD resistance to the reference resistance into digital form. The MAX31865’s inputs are
Which is the maximum voltage for umaxvoltagechange?
UMaxVoltageChange = maximum voltage change in HV DC bus during this current surge/peak. I.e. if drive is set to fault at 56V and supply voltage is 48VDC, then 56-48V=8V should be used.
What kind of ADC does max31865 have?
Detailed Description. The MAX31865 is a sophisticated RTD-to-digital converter with a built-in 15-bit analog-to-digital converter (ADC), input protection, a digital controller, an SPI-compatible interface, and associated control logic.
When do over voltage and under voltage faults occur?
These faults occur when drive measures a HV DC bus supply voltage that is not within the range defined by Under voltage fault thresholdFUV and Over voltage fault thresholdFOV parameters. The deviation of voltage may be impossible to notice with multimeter as length of these voltage surges can be in millisecond range.
The MAX31865 is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets the sensitivity for the RTD being used and a precision delta-sigma ADC converts the ratio of the RTD resistance to the reference resistance into digital form.
Can a resistor be converted to a voltage?
If you put the resistor into a non inverting amplifier as the input or feedback resister, you could easily convert resistance into voltage, and then convert to resistance after measuring the output voltage via an ADC, which is widely available on cheap ucontrollers.
Can a max31865 EV kit be used as an RTD?
The EV kit includes a MAX31865ATP+ installed as well as a USB-to-SPI interface. The USB-to-SPI master section of the EV kit can be used to interact with the MAX31865 EV kit software and exercise the device’s functionality. The evaluation kit does NOT come with an RTD. To evaluate temperature, a user-supplied RTD must be connected.
Is there a parallel port for an A / D converter?
If you really want to use the parallel port get yourself an A/D converter chip with two inputs and measure the reference voltage and te voltage over your resistor, with a known series resistor. A/D converter chips are available in parallel, SPI or I2C fashion (to name a few), which can be interfaced to a parallel port (with some SW effort).