TI中文支持网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
Susan Yang：
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
