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ISO1540: 为何移除ISO1540 B-Side 上拉电阻后,可以带动更长的通讯 线材?

Part Number: ISO1540

当前测试ISO1540 可以带到最长 16m, SMBUS协议 烧录成功;

但是无意中,移除ISO1540 B-SIDE端 上拉电阻 SMBC/SMBC 1Kohm 后;可以带到最长 25.2m, SMBUS协议 烧录成功;

本意用逻辑分析仪查看,但目前 尚无法找到原因?

通讯线材  AFS铁氟龙耐高温线材 2芯双绞 0.2平方毫米;长度测试如下 表格;