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ADS1234 低温-40℃总是测得满量程?

Other Parts Discussed in Thread: ADS1234

不知道是什么原因,MSP430采集ADS1234AD一到低温-40℃就成满量程了,慢慢升温回来,数据又自动恢复,请问什么原因,是买到假片了吗?