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TMCS1108受磁干扰问题

Part Number: TMCS1108

继电器触点电路中串入霍尔芯片TMCS1108A3B,测量触点上电流,此霍尔芯片在负载电流为0的情况下,继电器触点闭合与不闭合输出电压差了13mv,经测试发现是继电器线圈引起的磁干扰造成,同时周边其他继电器或者大电流都会引起TMCS1108A3B的输出变化,最大可能导致0.1V的偏差,对应偏差的电流高达0.5A,请问大家有何改善措施