I'm trying to run ads7924 using stm32f series.
But i2c does not work so I check the i2c line.
Between 0R, MCU side 3.3V but ads7924 side 0V. I set pull up setting of MCU internally .
What is the problem? below is the circuit i designed
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2\$\begingroup\$ If you have 3.3V at the MCU end of the SDA line, and 0 V at the ADC, you must have a broken connection (open circuit) between the MCU and ADC. \$\endgroup\$– Peter BennettMay 29, 2020 at 23:04
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1\$\begingroup\$ Is 0R a zero ohm resistor? If so, you cannot have different voltages on each side. \$\endgroup\$– AnnieMay 29, 2020 at 23:05
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1\$\begingroup\$ I see no ground connection on MCU side. Is MCU ground connected to ADS7924 DGND? \$\endgroup\$– glen_geekMay 29, 2020 at 23:25
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1\$\begingroup\$ "I set pull up setting of MCU internally" the internal MCU pull-ups are nowhere even close to the I2C slew requirements \$\endgroup\$– MapleMay 30, 2020 at 0:17
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\$\begingroup\$ Annie - yes.. its 0R. I designed it to debug point.. \$\endgroup\$– jeong boseungMay 30, 2020 at 5:23
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