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LMX1214: Differences between register settings the datasheet and TICS Pro.

user4950923
Prodigy 110 points

Part Number: LMX1214

I configured the LMX1214 registers using TICS Pro, but there are discrepancies with the datasheet. 

(1) R8 Register AUXCLKOUT_EN: In the datasheet, it's assigned to D5, but in TICS Pro, it seems to be assigned to D4.
Which is correct, the datasheet or TICS Pro?

AUXCLKOUT_EN.png

 

(2) In the TICS Pro GUI below, checking the MUXOUT checkbox sets D6 of R23 Register to '1', but in the datasheet, it's '0', and it appears nothing is assigned. Is it necessary to set R23 D6 bit to '1' when using MUXOUT?

MUXOUT.png

  • 0
    TI__Guru** 121130 points

    Hi there,

    1. AUXCLKOUT_EN, TICS Pro is correct, this bit is located in R8[4].

    2. MUXOUT (R23[6]), is a configurable bit, 0 = lock detect output; 1 = register read back; silicon default = 0. So if we want to do register read back, we need to program this bit to =1. 

  • 0 in reply to Noel Fung
    Prodigy 110 points

    Hi Noel,

    MUXOUT (R23[6]), is not mentioned in the LMX1214 datasheet.
    Could you let me know, when R23[6] = '0', 
    does MUXOUT pin 'High' indicates 'Lock Detect',
    MUXOUT pin 'Low' indicates 'Unlocked'.

  • 0 in reply to user4950923
    TI__Guru** 121130 points

    Hi There,

    Correct, when R23[6] is set to 0, the MUXOUT pin represents lock detect output. If the multiplier is locked, this pin goes HIGH. 

  • 0 in reply to Noel Fung
    Prodigy 110 points

    Hi Noel,

    I'd like to ask one more question.

    In the LMX1214 datasheet, the notes for register R7[0] state 'Program this field to 0x1.'.  I wrote 0x1, but when I read it back, it returns '0x0'.
    This bit is 'UNDISCLOSED' in the datasheet.
    Is it normal for register R7[0] to read 0x0?
    And, is it possible for other 'UNDISCLOSED' register values ​​to read values ​​different from the written values?

  • 0 in reply to user4950923
    TI__Guru** 121130 points

    HI There,

    Yes, it is normal that the read back values may not be equal to the written values, datasheet has the following notes on SPI read back.