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CDCM6208: 没有用到SEC_REF, SEC_REF管脚和VDD_SEC_REF管脚应该如何接

Part Number: CDCM6208


没有用到SEC_REF, SEC_REF_P、SEC_REF_N管脚和VDD_SEC_REF管脚应该如何接?能否悬空?产品手册是否有依据(我没找到)?