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TPS65235: Band high/low not changing, even after the LNB is configured according to the datasheet.

Shaji Mathew
Prodigy 20 points

We are observing that the Band(High/Low) is not changing on the LNB monitor, even after the LNB is configured according to the datasheet.
The LNB is configured by setting bit 3 (EN) of Control Register 2 to 1 and then setting the bits VSET0 to VSET3 according to table 6 to get voltages of 13.4,14,18.2,19.4 and 20 (any one voltage at a time). These settings are done using the I2C interface. But there is no change in the LNB voltage output – it remains greater than 15V as seen on an LNB monitor.  Is there any sample code which illustrates how to set the output voltage?
Also, how is polarization changed from vertical to horizontal and vice versa?

  • 0
    TI__Genius 15135 points
    Hi, shaji

    1. I think the most possible reason is that you used wrong I2C Address Selection.
    How do you configure ADDR pin? please look up the table4 and check if used correct I2C Address Selection.

    2. sorry, there is no sample code for your reference.

    3. sorry too, i don't know the polarization.

    thanks.

    zhao
  • 0 in reply to Zhao Ma
    Prodigy 20 points
    Hi Zhao,

    Thank you for responding.
    After setting the I2C_CON bit in control register1 , it wasn't necessary to set bit 3 (EN) of Control Register 2 and setting high/low band worked.

    Regards
    Shaji