SN65HVD33: Resistance problem

yichuan guo

Part Number: SN65HVD33

It is used in RS422 circuit. Why the resistance of B Pin and GND Pin of SN65HVD33DR is 2.2Ω， they are short circuit. But the communication is normal.

1 年多前

0 Kailyn Chen 1 年多前

TI__Guru**** 295050 points

Hello， if the receiver is enable, output is always determined by VID. If it above VIT+ the output will be high; if it is below VIT- the output will be low.

So even though the B is short, if the Vid is still above VIT+ threshold ,it could also output high.

In addition, SN65HVD33 has integrated failsafe circuit, please refer to "9.3.4 Receiver Failsafe" section.

https://www.ti.com.cn/cn/lit/ds/symlink/sn65hvd33.pdf

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SN65HVD33: Resistance problem