• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 53 subscribers
  • Views 705 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

cc1190 same power HGM=0 or HGM=1

Buyssens Hubert
Intellectual 685 points
Other Parts Discussed in Thread: CC1190, CC1101

Hello,

 

I’m working on a board with CC430 and CC1190 (same design as http://www.ti.com/tool/cc1101-cc1190em869rd , but the CC1101 is replaced by a CC430).

I’m sending some word alternatively with high power and reduced power, so the receiver could receive if range is short or extended.

I’m driving CC1190 with PA_TABLE = 0x81, so should be +5dBm according to AN I read.

 

But I’ve noticed that when I toggle with following settings :

High power : PA_EN=1 / HGM=1

Reduced power : PA_EN=1 / HGM=0

TX power (measured with RSSI value in RF Packet sniffer) are the same.

 

When I toggle with following settings

High power : PA_EN=1 / HGM=1

Reduced power : PA_EN=0 / HGM=0

TX power (measured with RSSI value in RF Packet sniffer) are different.

 

But CC1190 datasheet suggests to do it with first setting…

So, anyone have an explanation?

Does the CC1190 could be damaged if TX when PA_EN=0 (or RX when LNA_EN=0)?

Regards,

Hubert

  • 0
    TI__Guru**** 317180 points

    - What is your goal by toggling HGM?

    - For CC1190 the difference in output power setting HGM='0' or '1' is minimal, this mode is mainly used in RX. If you want lower output power, the the PA table on CC430 lower.

  • 0 in reply to TER
    Intellectual 685 points

    My goal is to set lower power.
    So OK, it's better to do it with PA_TABLE.
    But, if results are good whith PA_EN=0, is it OK for CC1190?
    Is there a risk to damaged it?

    I think that Power should be few dB differences with HGM=0 or 1.
    And, as I'm facing some range problem, I want to be sure that the CC1190 is OK with PA enable and High Gain, to be sure that my output power is at its best.

    I can't have access to a spectrum analyzer so I can't really measure output power, but I need maximum range.
    Is it an other way to measure if the CC1190 is used at its best TX performances?

    Regards,

  • 0 in reply to Buyssens Hubert
    TI__Guru**** 317180 points

    From my experience setting PA_EN=0 will attenuate the signal by ~30 dB (basically leakage through the PA switch). Using this option should be ok from a reliability perspective but you will have more control over the output power if you use the PA table.

    To get maximum range you should use the settings from the CC1101+CC1190 app note. Note that for ETSI you can't use maximum output power to comply with the regulation.