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SN65HVD82: Please Recommend Suitable part with lowest cost

Genius 9710 points

Replies: 1

Views: 60

Part Number: SN65HVD82

Dear Team,

Customer have below requirements for RS485, please recommend suitable part with the lowest cost:

All serial ports shall be able to handle the following communication speeds with a maximum deviation in transmitting and receiving speed(s) of ±3 %:

- 300 bps

- 1.2 kbps

- 2.4 kbps

- 4.8 kbps

- 9.6 kbps

- 19.2 kbps

- 38.4 kbps

- 57.6 kbps

- 115.2 kbps

- 230.4 kbps

 

All serial port shall have at least a 16-byte FIFO.

 

The RS485 bus transceiver shall be of type “Slew-Rate limited”.

 

The serial port shall support RS485 Modbus and pro-vide the power output of +12V, 200mA from each port.

Note: RS485 is a balanced signal point-to-multi-point layer 1 interface according to /ISOIEC8482/ and /TIA-EIA/

 

Serial port transceivers must have upper slew rate limit above or equal to 230.4 Kbit and below or equal to 2 * 230.4 Kbit.

 

There shall be a SW selectable line to line termination/bias for RS485 with 330-ohm termination and 680ohm pull-up to +3.3V & 680ohm pull-down to 0 V.

 

The RJ45 connector pinning shall be as specified in below table.  Pin1 & Pin3 is same A, Pin2 & Pin6 is same B

The ports must be isolated to each other and polarity protection must be ensured.

 

BR

Kevin

  • Kevin,

    I guess 12V supply and SW selectable termination/pull up/pull down are system (module) requirement.

    The low-cost RS-485 transceiver for your application would be THVD1500 (5V supply). Although it's not mentioned in the datasheet, THVD1500 does have the slew rate control function. If you're interested in other newly released TI RS-485, please refer to this post.

    https://e2e.ti.com/support/interface/f/138/t/849650

    Regards,

    Hao 

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