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CC1120 and external lna

Rene Gruhle
Intellectual 355 points
Other Parts Discussed in Thread: CC1120

Hi,

we are planning to design CC1120 with an external lna. Is it possible to control the lna with CC1120 gpio? high in rx and low in tx. In register description of gpiox_cfg there is setting 24 (lna_pd) for control external lna. Can I use this?

thx

  • 0
    TI__Guru**** 317180 points

    Yes.

    Note: When the IOCFGx.GPIOx_CFG setting is less than 0x30 and IOCFGx.GPIOx_INV is 0 (1), GPIO2 pins will be hardwired to 0 (1), and GPIO3 will be hardwired to 1 (0) in the SLEEP state.

    Dependent on if you need a PD signal or a ENABLE signal to control the external LNA you have to use either GPIO2 or GPIO3 to set the pin correct in SLEEP given that you need the external LNA in power down when CC1120 is in sleep.