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cc430+cc1190 patable setting

Dragos Ionescu
Intellectual 680 points
Other Parts Discussed in Thread: CC1190

Hi,

I have a custom board with cc430+cc1190 combination and I would like to find the patable setting where the power transmitted is less than 7dBm. In AN094, table4.6 there is no such setting, where should I look for?

Thanks,

Dragos

  • 0
    TI__Guru**** 317180 points

    Since CC430 alone is capable of giving +10 dBm we have not looked into which setting that has to be used for CC430+CC1190 to get +7 dBm. You could look at the setting with lowest output power in http://www.ti.com/lit/an/swra356/swra356.pdf, assume linear relation and subtract the required dB on the input power and look up the value in http://www.ti.com/lit/pdf/swra151

  • 0 in reply to TER
    Intellectual 680 points

    The reason I need this is related to the EC certification. Basically the module is working in two modes: interactive and sync locked. In interactive mode I need no limit in duty cycle and in sync lock mode I need power.

    This can be achieved (I think) by using two freq intervals:

    1. For no limit on duty cycle but TX power limited to 7dBm use 869.7-870 Mhz band

    2. For 10% duty cycle but up to +18dBm TX power use 869.4 – 869.65 MHz band

    The problem is that I have to change the base frequency when switching from one mode to another.

    Another approach would be to use multiple logical channels in adjacent bands, basically I need only to change the channel and the power level. Is this possible?

    Thanks,

    Dragos

  • 0 in reply to Dragos Ionescu
    TI__Guru**** 317180 points

    It is easy to change channel with CC430 by using the CHANNR register and channel spacing, see MDMCFG1 and MDMCFG0. The power level is easy to change by changing by adjusting the PATABLE register.