SN65C1167E: Alternative to SN65C1167E for higher ambient temperature

Vijaymahantesh Surkod

Part Number: SN65C1167E
Other Parts Discussed in Thread: UCC21756-Q1, AM26C31, AM26C32

Tool/software:

Hi,

I am currently in the process of making a gate driver board that will have UCC21756-Q1. I would like to use a differential receiver at the gate driver board (to receive 4 PWM to drive a H-Bridge), and I went through EVM User's Guide: UCC217XXQDWEVM-054, in which SN65C1167E driver receiver is used. We estimate our ambient temperature to be anything around 80 to 100 degrees Celsius. So I would like some help regarding choosing a differential driver and receiver which has four channels (driving in the control board and receiving in the gate driver board. I would think, as of now, the signals might have to travel about 150 cm to 200 cm (it is going to be a highly noisy environment). So, can you let me know if AM26C31/32 can be used for such a distance (switching frequency is 100kHz)? or do you suggest any other part that has an operating temperature of at least 125 degrees Celsius?

Thank you

1 month ago

+1 Clemens Ladisch 1 month ago

Guru 271570 points

Here is a list of four-channel drivers and receivers that support 100 °C: ti.com/interface/rs-485-rs-422/products.html#993=0;4&994=4;0&1192=-25;105

RS-422 easily can transmit over hundreds of meters.

For noise resistance, ensure that the cable uses twisted pairs. To increase noise resistance even more, add common-mode chokes and/or shielding.

0 Vijaymahantesh Surkod 1 month ago in reply to Clemens Ladisch

Prodigy 230 points

Thank you for the reply. For AM26C32 and AM26C31, do you have any recommended circuits at the driver side and receiver side termination, like it was shown in EVM User's Guide: UCC217XXQDWEVM-054, and any recommended CM chokes?

+1 Clemens Ladisch 1 month ago in reply to Vijaymahantesh Surkod

Guru 271570 points

As shown in the EVM schematic, you need a termination resistor only at the differential receiver. The EVM uses inductors and a capacitor as a low-pass filter; what values to use depends on what frequency you will be using. What common-mode choke to use depends on what noise frequencies you expect.

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SN65C1167E: Alternative to SN65C1167E for higher ambient temperature