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Hi All,
I'm trying to use the 8-channel ADC_SAR_SEQ on the CY8CKIT-042-BLE development kit. I can get appropriate ADC measurement readings for the first 4 channels, but the ADC cannot read voltages 0-995mV on channels 4 (P3[4]) & 5 (P3[5]), and cannot read voltages 0-311mV on channels 6 (P3[6]) & 7 (P3[7]). I am using a benchtop supply to feed the input voltage directly into the ADC_SAR pins through (P3[0]-P3[7]).
I'm using the following ADC configurations:
Vref Select: External Vref
Vref Value: 2.5V
Single ended negative input: Vref
Single ended result format: Unsigned
Clock source: Internal
All 8 channels use 12-bit resolution single-ended mode
Acq time: 1.5us
Conversion time 16us
Do you have any idea what could be preventing the last 4 channels from reading the low voltages? Thank you very much for your time!
Solved! Go to Solution.
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BLE
- Tags:
- adc_sar_seq
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Have a look at the kit's schematic files. Probably your input pins are already connected to some caps or other hardware. Schematics have been installed on your PC when you installed the kit files.
Bob
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Have a look at the kit's schematic files. Probably your input pins are already connected to some caps or other hardware. Schematics have been installed on your PC when you installed the kit files.
Bob
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Bob,
Thanks for your response. It turns out P3_4 & P3_5 are tied to I2C_SDA & I2C_CLK while P3_6 & P3_7 are tied to the Green & Blue LEDs. I really appreciate your help.
-Junya