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关于ads1192 ecg芯片的部分疑问,请教各位高手们

Other Parts Discussed in Thread: ADS1192

(学生党一枚)看完ADS1192的芯片手册,总结出下列几个不解之处:

1、管脚不理解:

                        a,关于芯片拥有的两个GPIO1和GPIO2,是用来做什么的?

                        b、芯片位双通道,为什么还会有个IN3管脚

                       c、既然是PGA,那么为什么还要讲pga管脚要接出来,

哪位大神能解答一下。对于芯片手册,,还在看,,已经很多看不懂了