Texas Instruments 3138 155 232931 - Manual (Page 75)

CC2420
SWRS041B Page 75 of 89
MANOR (0x22) - Manual signal OR override register
Bit Field Name Reset R/W Description
15 VGA_RESET_N 0 R/W The VGA_RESET_N signal is used to reset the peak detectors in
the VGA in the RX chain.
14 BIAS_PD 0 R/W Global Bias power down (1)
13 BALUN_CTRL 0 R/W The BALUN_CTRL signal controls whether the PA should receive
its required external biasing (1) or not (0) by controlling the
RX/TX output switch.
12 RXTX 0 R/W RXTX signal: controls whether the LO buffers (0) or PA buffers
(1) should be used.
11 PRE_PD 0 R/W Powerdown of prescaler.
10 PA_N_PD 0 R/W Powerdown of PA (negative path).
9 PA_P_PD 0 R/W Powerdown of PA (positive path). When PA_N_PD=1 and
PA_P_PD=1 the up-conversion mixers are in powerdown.
8 DAC_LPF_PD 0 R/W Powerdown of TX DACs.
7 XOSC16M_PD 0
6 RXBPF_CAL_PD 0 R/W Powerdown control of complex bandpass receive filter calibration
oscillator.
5 CHP_PD 0 R/W Powerdown control of charge pump.
4 FS_PD 0 R/W Powerdown control of VCO, I/Q generator, LO buffers.
3 ADC_PD 0 R/W Powerdown control of the ADCs.
2 VGA_PD 0 R/W Powerdown control of the VGA.
1 RXBPF_PD 0 R/W Powerdown control of complex bandpass receive filter.
0 LNAMIX_PD 0 R/W Powerdown control of LNA, down-conversion mixers and front-
end bias.
AGCCTRL (0x23) - AGC Control
Bit Field Name Reset R/W Description
15:12 - 0 W0 Reserved, write as 0
11 VGA_GAIN_OE 0 R/W Use the VGA_GAIN value during RX instead of the AGC value.
10:4 VGA_GAIN [6:0] 0x7F R/W When written, VGA manual gain override value; when read, the
currently used VGA gain setting.
3:2 LNAMIX_GAINMODE_O
[1:0]
0 R/W LNA / Mixer Gain mode override setting
0 : Gain mode is set by AGC algorithm
1 : Gain mode is always low-gain
2 : Gain mode is always med-gain
3 : Gain mode is always high-gain
1:0 LNAMIX_GAINMODE
[1:0]
3 R Status bit, defining the currently selected gain mode selected by
the AGC or overridden by the LNAMIX_GAINMODE_O setting.