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  • TI Thinks Resolved

Isolated RS485 driver IC

Hi All,

Doing RS485 daisy chain test for transfer data more than 500 meters, system has one master(MSP430F5329)  to 11 (TMS320F28062)slaves, master to 1st slave RS485 cable length is 1meter and 2nd to 3rd has more than 20 meters RS485 cable length like that reaming also. 

my problem is mater to 7 slaves up to 120 meters RS485 signal voltages are fine (>4.5v) as per RS485 driverIC ISO3082, after increasing  length of RS485 length it's going to less than 4.5v , also device is running but don't want to take risk.

Can any body suggest RS485 signal voltage levels less than 3v supported driverIC, other wise I/P voltage is greater than 5v means 12v or 18v and output side(RS485 signal voltage) 5v.  

  • Hi All,

    Can any body suggest RS485 out put signal voltage levels less than 3v and input voltage is 5v  supported RS485 driver IC, other wise I/P voltage is greater than 5v means 12v or 18v and output side(RS485 signal voltage) go down up to 5v.  

  • In reply to mahdhu kommu1:

    Mahdhu,

    Do you need isolated RS 485?

    Respectfully,

    Lucas Schulte

    Apps Engineer

    ASC-INT-ISO

  • In reply to Lucas Schulte9:

    HI Lucas,
    thanks for replay, yes , need Isolated RS485 driver IC.

    my requirement is less output rs485 signal minimum voltage, presently using ISO3082 in that minimum output voltage is 4.5v.
  • In reply to mahdhu kommu1:

    Mahdhu,

    The ISO35 may work for this condition. The minimum output voltage is 2.4V . Also, using the M-LVDS transceivers, such as the SN65MLVD204B, combined with basic digital isolation devices like the ISO7740 family may also be a solution to handle your particular application. 

    -Lucas Schulte

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