DCOUPL 40 RBIAS 30 作用

cc2540管脚  DCOUPL  40   RBIAS 30  的作用详解    为什么一定要是C401电容  和56K的电阻

DCOUPL  40  Power (digital) 1.8-V digital    power-supply decoupling. Do not use for supplying external circuits. 

C401 Decoupling capacitor for the internal 1.8-V digital voltage regulator 

The 1.8-V on-chip voltage regulator supplies the 1.8-V digital logic. This regulator requires a decoupling capacitor
(C401) for stable operation.

RBIAS   30    Analog I/O   External precision bias resistor for reference current  

R301 Precision resistor ±1%, used for internal biasing