CC2420 Datasheet, PDF (75/92 Pages) List of Unclassifed Manufacturers – 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver

CC2420
MANOR (0x22) - Manual signal OR override register
Bit
15
Field Name
VGA_RESET_N
14
BIAS_PD
13
BALUN_CTRL
12
RXTX
11
PRE_PD
10
PA_N_PD
9
PA_P_PD
8
DAC_LPF_PD
7
XOSC16M_PD
6
RXBPF_CAL_PD
5
CHP_PD
4
FS_PD
3
ADC_PD
2
VGA_PD
1
RXBPF_PD
0
LNAMIX_PD
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
The VGA_RESET_N signal is used to reset the peak detectors in
the VGA in the RX chain.
Global Bias power down (1)
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.
RXTX signal: controls whether the LO buffers (0) or PA buffers
(1) should be used.
Powerdown of prescaler.
Powerdown of PA (negative path).
Powerdown of PA (positive path). When PA_N_PD=1 and
PA_P_PD=1 the up-conversion mixers are in powerdown.
Powerdown of TX DACs.
Powerdown control of complex bandpass receive filter calibration
oscillator.
Powerdown control of charge pump.
Powerdown control of VCO, I/Q generator, LO buffers.
Powerdown control of the ADCs.
Powerdown control of the VGA.
Powerdown control of complex bandpass receive filter.
Powerdown control of LNA, down-conversion mixers and front-
end bias.
AGCCTRL (0x23) - AGC Control
Bit
15:12
11
10:4
Field Name
-
VGA_GAIN_OE
VGA_GAIN [6:0]
Reset R/W
0
W0
0
R/W
0x7F R/W
3:2
LNAMIX_GAINMODE_O 0
R/W
[1:0]
1:0
LNAMIX_GAINMODE
[1:0]
3
R
Description
Reserved, write as 0
Use the VGA_GAIN value during RX instead of the AGC value.
When written, VGA manual gain override value; when read, the
currently used VGA gain setting.
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
Status bit, defining the currently selected gain mode selected by
the AGC or overridden by the LNAMIX_GAINMODE_O setting.
SWRS041B
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