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CC1101 + CC1190 with MSP430FG4618/F2013 Experimenter Board transmission problem

marco cavatorta
Prodigy 50 points
Other Parts Discussed in Thread: MSP430FG4618, CC1101, CC1190

Hi everybody

I'm using the MSP430FG4618/F2013 Experimenter Board to control the CC1101CC1190 transceiver(both 915 and 869 MHz).

My current goal is transmitting power at a certain freq. (869/915) in continuous way. I'm using IAR embedded workbench to program.

I've downloaded the software "Wireless interface using MSP430" for IAR and I based my software on it.

First of all I used the CC1101EM 868/915 MHz, and I used the values given by SmartRF Studio 7 in order to  transmit only in continuous way, and it worked in that way.

Afterwards I took the CC1101-CC1190EM,I used the same program and I used the register settings given by SmartRF Studio 7(choosing the appropiate range extender).

The SmartRF Studio settings are the following:

Base frequency: 915 (or 869);

Channel number: 0;

Channel spacing: 200 kHz;

Xtal freq. : 26 MHz (27 MHz);

Data rate: 1.2 kBaud;

RX filter BW: 58 kHz;

Modulation format: ASK/OOK;

Continuous transmission, unmodulated;

Data format: Sync. serial mode.

Output power: 15 dBm.

In this way it does not work very well, I mean, randomly the RF signal switches from 13 dBm to -30/ -40 dBm.

I put the jumper on the tranceivers in this way:

PA_EN = GDO0;

LNA_EN = GDO2;

HGM = VDD.

Since I want only to transmit, I need this configuration: PA = ON, LNA=OFF, HGM =ON. Hence I've tried to change the GDOX_CFG as follows:

IOCFG0 = 6F

     > GDO0_INV = 01 (Hardwired to 1 = PA on)

     > GDO0_CFG= 2F (can be used to control external PA/LNA, from page 62 of CC1101 datasheet)

IOCFG2 = 2F 

      > GDO2_INV = 00 (Hardwired to 0 = LNA off)

      > GDO2_CFG = 2F

In this case I have almost the same RF signal behavior as before. It's seems like a power supply problem.

Have you got any tips? 

Thanks in advance.

  • 0
    TI__Mastermind 39860 points

    Have you checked if the experimeters board have the necessary current source capability? Try to power the CC1101-CC1190EM from a lab supply.

  • 0 in reply to Sverre
    Prodigy 50 points

    Hi Sverre

    Yes, I tried to power the experimenters board with a lab supply, rather than the batteries supply.  I set the voltage at 3 V, but the behavior is always the same, randomly the RF signal switches from 13 dBm to -30/ -40 dBm.

    When it transmit at 13 dBm the current consumption is 106 mA.

    I have also the MSP-430FR5739 experimenter's board, and in the user guide is written that it's compatible with CCxxxx transceivers.

    Is it compatible also with CC1101-CC1190EM combo board?

  • 0
    TI__Guru**** 317180 points

    In the case the output power goes from +15dBm to -30dBm, could you please monitor the PA_EN pin on CC1190? I suspect it for some reason goes up and down.

    Could you please try to hardwire the PA_EN and LNA_EN to VDD/GND and see if that solves the problem. I know that you need to be able to control the pins but it is a way to try to pinpoint the problem.

  • 0 in reply to TER
    Prodigy 50 points

    Hi TER,

    I tried to hardwired PA_EN and LNA_EN to VDD/GND and it work in this way.

    Thank you a lot.