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CC1200 low power mode RX/TX

Rene Gruhle
Intellectual 355 points
Other Parts Discussed in Thread: CC1125, CC1200, CC1120

Hi, how can I set the CC1200 into low power rx and tx? There is no "switch" as provided with CC1125! I tried some reg Settings for TX: - xosc1:xosc_buf_sel (0x0) - fs_dig0:tx_lpf_bw (0x0) The current falls from 36,3mA @ 10dBm @3V to 34,8mA @ 10dBm @3V! In RX I modify the agc_cfg2:fe_performance_mode (0x2)! Are there any other register to set for low power mode? Does the low power mode in TX affects the spectrum? best regards, REG
  • 0
    TI__Guru**** 317180 points

    You could get lower power consumption by using: 

    FS_CFG 12
    IF_ADC1 EE
    IF_ADC0 10
    FS_DIG1 7
    FS_DIG0 50
    FS_CAL1 40
    FS_CAL0 E
    FS_DIVTWO 3
    FS_DSM1 2
    FS_DSM0 33
    FS_DVC1 F3
    FS_DVC0 13
    FS_PFD 0
    FS_PRE 6E
    FS_REG_DIV_CML 1C
    FS_SPARE AC
    FS_VCO0 B8
    XOSC5 E
    XOSC1 1
  • 0 in reply to TER
    Intellectual 355 points
    That works! In TX the current falls from 36,3 mA to 33,6 mA @ 3V @ 10dBm! Does this affects the spectrum (e.g. phase noise ...) ? In RX I also set agc_cfg2:fe_performance_mode to low power with reduced gain range! The Current ist 19 mA!
  • 0 in reply to Rene Gruhle
    TI__Guru**** 317180 points

    The lower current consumption is achieved mainly by reducing the internal swings in the synth. This increases the phase noise. Please check the blocking performance stated in the datasheet for CC1200 and CC1120 for the two mode to see the effect.

    I have sent in a request to include Low Power Mode in Smart RF Studio for CC1200 in an upcoming release.