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CC2340R5: DIO21为模拟量输入,外部直接连接放大器时,芯片不能运行。

Part Number: CC2340R5
Other Parts Discussed in Thread: SYSCONFIG

芯片:CC2340R5  RGE QFN24

DIO21_A10作为模拟量输入采集接口

一、当直接连接运放的输出,运放输出电压低于3V,芯片不能正常启动。

(1)请问是需要串联匹配电阻吗,匹配电阻串联 多少合适?

(2)DIO21作为模拟量采集功能接口时,其内部电阻为多大?

二、串联10K电阻后,芯片能够正常运行,但采样值变化很大,这会是什么原因?