Hi
We uses TMP235A4DCKT to design a temperature sensor.
Could you help check the schematic? Thank you!
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Hi
We uses TMP235A4DCKT to design a temperature sensor.
Could you help check the schematic? Thank you!
Hi Hank,
Thank you for posting to the Sensing forum.
The external filter capacitor (C60) is too large. The TMP235 is characterized with a 1000-pF maximum capacitive load. This load is shown as the sum of CFILTER + CMUX + CSAMPLE in the datasheet figure below. It is recommended to maximize the external filter while keeping an allowance for the specified ADC input capacitance.
The TMP235 datasheet recommends a 680-pF CFILTER to account for ADC input capacitance without exceeding the 1000-pF maximum load.
Section 8.2.1.1 in the datasheet covers these design requirements in more detail.
Best regards,
Nicole