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ADS1299: Vcap的電壓問題

Part Number: ADS1299

使用自製的PCB版,檢測輸入點電壓都沒問題,如圖1到圖3

圖1.(DVDD,3.3V)

https://drive.google.com/file/d/14FyHR4_YttuthcytrHVe8Ccsv7FpT8Pi/view?usp=drive_link


圖2.(AVDD,2.5V)

https://drive.google.com/file/d/15yKJl_j1WJpt1pncAWI4_B_3yMCZyHyV/view?usp=drive_link


圖3.(AVSS,-2.5V)

https://drive.google.com/file/d/1m-osH07E7S8VqnFsTCNtCWRpNOJtc4ev/view?usp=drive_link



圖4.VCAP1

https://drive.google.com/file/d/1Gebw_Ylmfq-jrMOwv2-oAHGeQyxdxSHz/view?usp=drive_link


圖5.VCAP2

https://drive.google.com/file/d/1cn1Hlm4lHCAgVqQf-ZW1b6wOjMZUxriF/view?usp=drive_link


圖6.VCAP3

https://drive.google.com/file/d/1gszNp-F86tMML8pT6XjxrcZABmt5ItPk/view?usp=drive_link


圖7.VCAP4

https://drive.google.com/file/d/1E-tGPdh3uZipjPc4i5npxBuN2aa5A1Lp/view?usp=drive_link


圖8.Vref

https://drive.google.com/file/d/1E-tGPdh3uZipjPc4i5npxBuN2aa5A1Lp/view?usp=drive_link



根據[FAQ] ADS1298: ADS129x:如何验证 ADS129x 器件是否仍然正常工作? ,檢測內部電壓節點,發現VCAPx 都有問題
ADS1299的 連接 VCAP1 的電容C22跨壓卻是0V,C22兩端皆為-2.5V,連接 VCAP2 的電容C23跨壓在-1~-0.3V之間來回,連接 VCAP3 的電容C18跨壓為4.07V,連接 VCAP4 的電容C19跨壓為1.1V,連接 Vref 的電容C14跨壓為0.07V
想請問可能的原因?

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