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CC2530-RBIAS 电阻值设置为多少依据是什么?



CC2530-RBIAS 电阻值设置为多少依据是什么?

datasheet描述为

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

设置参考电流(bias resistor for reference currentreference current),,设置什么的参考电流呢?
电阻值对应的参考电流,计算方法是什么呢? 请帮忙详细说明一下

参看回复说,要设置是56K, why? 如果是要固定56k,  为什么不在芯片里固化呢?