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CC1110 -> CC1120 reception - As good as CC1120 -> CC1120?

Alex Andreae
Prodigy 20 points
Other Parts Discussed in Thread: CC1120, CC1190, CC1310

We're looking to implement an 802.15.4 network at 915Mhz with very low data communication (~10 bytes) at long range.

There will be 2 products: a base station and slow moving remote sensors that may come in/out of range of base station periodically. The base station will be powered and can be 'large'. The sensors need to be as small as possible. 

The current part plan would be:

Sensor: CC1110. This can be pushed to the max transmit power.

Base Station: MCP430 (or similar processor) with CC1120 transceiver.

There will not be directly line of sight with transmissions through walls. We're hoping to get ~1mile transmissions from the sensors to the base station.

The CC1110 is selected since it's smaller with the microprocessor built-in. My understanding is that the CC1120 has much better receiver characteristics, but the transmission characteristics of both the CC1110 and CC1120 seem similar. With the topology above, it means the base station should (ideally) still be able to receive transmitted data while the remote sensors may not be able to receive information from the base station.. which is acceptable for us.

The Sensor's may even use the CC1190 as a booster for extra transmission range.

Does that seem like a correct selection of transceivers for our requirements?

Would there be any real transmission benefit of using the CC1120 over the CC1110 in the sensor? We'd prefer not to, due to space/cost, but if I'm missing something, we'd like to know now.

Thanks,

Alex

  • 0
    TI__Guru**** 317180 points

    With CC1110+CC1190 the maximum output power will be around +20 dBm, with CC1120 it's possible to do +27 dBm. Without CC1190 CC1110 does 10 dBm, CC1120 14 dBm. But a CC1110 sensor will be more compact than CC1120+MCU as you point out but if you include a CC1190 the gain is smaller since CC1190 needs some space due to the high output power.

  • 0 in reply to TER
    Prodigy 105 points

    Hello TER,

    I am sorry. I know this is not a right topic to post my query.

    But I saw a line in this post, which relates to my query. Below line 

    "With CC1110+CC1190 the maximum output power will be around +20 dBm"

    Is this right choice to integrate CC1110 to CC1190. I see, No "Smart RF studio" is supporting this combination to test.

    Can you please support me to setup radio registers of CC1110+CC1190. I already have a custom PCB with this combination.

    To achieve better range (500m), What is the data rate, RX filter, Deviation, output power, Settings. I am working on 868Mhz Band.

    Sorry for my poor English.

    Thanks in Advance,

    Best regards

    Bharath Muthukuri

  • 0 in reply to muthukuri bharath
    TI__Guru**** 317180 points
    For CC1110-CC1190, use the same settings as CC1101-CC1190. See SmartRF Studio and www.ti.com/.../swra356

    For better range you need to increase the link budget which can be done by increasing the output power or improve the sensitivity. The later is possible be reduce the datarate and the Rx bandwidth.

    What is the background for choosing CC1110 and not CC1310?