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CDCE706: Default Reg values and Revision Code

Takashi Onawa
Genius 13200 points
Part Number: CDCE706


Hi team,

Could you share the default Reg dump of CDCE706? The datasheet only says non-Reserved bits info. 

My customer is facing abnormal heating of CDCE706 and frequency is also strange against settings so I want to be back it to default by the initial Reg setting.

Also, I want to check Revision Code as well. The datasheet says "01h" should be written for Byte 0 but generated setting by TI Clock pro tool shows "11h" for Byte 0.
Which should be correct for now?

Regards,

Takashi Onawa

  • 0
    TI__Mastermind 20900 points

    Hi Onawa-san,

    attached is the default EEPROM setting for CDCE706.

    Fullscreen cdce_706_default.txt Download 
    Bit  ==>  76543210
Byte 00 - 00010001
Byte 01 - 00000001
Byte 02 - 00000001
Byte 03 - 11100000
Byte 04 - 00000001
Byte 05 - 00000001
Byte 06 - 00000000
Byte 07 - 00000001
Byte 08 - 00000001
Byte 09 - 00000000
Byte 10 - 00000000
Byte 11 - 00000000
Byte 12 - 00000000
Byte 13 - 00000001
Byte 14 - 00000001
Byte 15 - 00000001
Byte 16 - 00000001
Byte 17 - 00000001
Byte 18 - 00000001
Byte 19 - 00111000
Byte 20 - 00111000
Byte 21 - 00111000
Byte 22 - 00111000
Byte 23 - 00111000
Byte 24 - 00111000
Byte 25 - 00000000
Byte 26 - 00011011

    Can you elaborate on "abnormal heating"?

    Byte0 is a read only register and cannot be changed via programming. It should readback 11h.

    regards,

    Julian

  • 0 in reply to Julian Hagedorn
    TI__Genius 13200 points

    Hi Julian-san,

    Thank you for your prompt response on this.

    OK, I understood that the readback value of Byte0 should be 11h for now.

    I don't have the EVM in my office so Can you check that on your bench after I got their setting table?

    According to the engineer, they change SSC modulator setting during their evaluation. so this point caused something bad in the device since datasheet says as below.

    The PLL must be bypassed (turned off) when changing the SSC Modulation Frequency Factor on-the-fly. This can be done by the following programming sequence: bypass PLL2 (byte 3, bit 6 = 1); write new Modulation Factor (byte 25); re-activate PLL2 (byte 3, bit 6 = 0).

    I'm just asking them bypassing PLL2 before modulation factor change. and waiting their feedback now.

    Regards,

    Takashi Onawa

  • 0 in reply to Takashi Onawa
    TI__Mastermind 20900 points

    Hi Onawa-san,

    did you got feedback if the new programming sequence solved that issue?

    regards,

    Julian

  • +1 in reply to Julian Hagedorn
    TI__Mastermind 20900 points

    Hi Onawa-san,

    i am closing this thread as i did not hear from you.

    Please post again, if you have additional information.

    regards,

    Julian

  • +1 in reply to Julian Hagedorn
    TI__Genius 13200 points

    Hi Julian-san,

    Sorry for my slow response on this.

    I have confirmed they can solve this issue. It seems that they notice there was something wrong in their sequential write data in I2C. After correct the point, the device worked properly.

    I really appreciate your quick and strong assists to solve this issue.

    Regards,

    Takashi Onawa