Comments on Do we need to use pull up resistors in SPI lines when the ADC and Microcontroller are far apart
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Do we need to use pull up resistors in SPI lines when the ADC and Microcontroller are far apart
I have an ADC board. This board will communicate with a STM32 develoment board via SPI interface. I am using jumper cables for connecting the ADC SPI lines to ST32 evaluation board.
Below is my ADC schematic. I gave the ADC schematic for review to the concerned analog devices team. The response received is given below.
We recommend adding the pull-up resistors on all lines. Generally, a 10k pull-up resistor can be used. However, if track/distance is long i.e. more than 5 to 8 inches then we would suggest using a 4.7k resistor. It could be useful to design these pull-up resistors in and they can be used as a ‘population option’.
For robustness and reliability (over time) Analog devices suggested to include pull-up resistors on the connector J4 going to the SPI pins.
May I know your thoughts.
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