azaz104
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dc voltage reference
Dear all,
I have a CC2430 chip "i think it's based on the 8051 MCU" , which i use to measure some analog sensor readings, the AVDD of the chip is 3.3 volts, and in the manual it's said that the chip can measure up to AVDD only.
I have a sensor that outputs a range of 5 volts, and I need to measure this voltage too, I rescaled it to 3 volts somehow , to measure it means i need to compare against EXTERNAL VOLTAGE REFERENCE, which the manual says should be applied to input pin 7 (the MCU has AIN0 to AIN7 , ADC pins)
when I connect the voltage reference to it. it shorts out, I measured the resistance and it turns out to be approximately ZERO !
how could I get this to work ?
anyone ?
Dear all,
I have a CC2430 chip "i think it's based on the 8051 MCU" , which i use to measure some analog sensor readings, the AVDD of the chip is 3.3 volts, and in the manual it's said that the chip can measure up to AVDD only.
I have a sensor that outputs a range of 5 volts, and I need to measure this voltage too, I rescaled it to 3 volts somehow , to measure it means i need to compare against EXTERNAL VOLTAGE REFERENCE, which the manual says should be applied to input pin 7 (the MCU has AIN0 to AIN7 , ADC pins)
when I connect the voltage reference to it. it shorts out, I measured the resistance and it turns out to be approximately ZERO !
how could I get this to work ?
anyone ?