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PCA9306 issue

Other Parts Discussed in Thread: PCA9306

我们采用的PCA9306 chip. 电路低压侧为3.3V, 高压侧为5V.

 EN and VREF2 信号 通过200k ohm 电阻连5V,100nf 电容接地!

发现当5V 关闭时(即PCA9306 disable),I2C BUS 会在一段时间被拉低到2.1V

分析是:5V 关断过程中,100nf 通过200k ohm 电阻放电,速度过慢引起

将200kohm 电阻修改10K电阻后,I2C BUS 不会再出现拉低的现象!

但是问题点是: 从datasheet上看,EN: Switch enable input. Connected to VREF2 and pulled up through a high resistor.

并且推荐值为200K ohm,请问如果将200K OHM 改为10K ohm,会有问题吗?

电阻的大小的改变会影响哪些方面?谢谢!