CC2420 Chipcon AS, CC2420 Datasheet - Page 73

• Manufacturer Part Number: CC2420
• Description: 2.4 GHz RF Transceiver for IEEE 802.15.4 and ZigBee
• Manufacturer: Chipcon AS

MANOR (0x22) - Manual signal OR override register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
AGCCTRL (0x23) - AGC Control
15:12
11
10:4
3:2
1:0
Chipcon AS SmartRF ® CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
Bit
Bit
Field Name
VGA_RESET_N
BIAS_PD
BALUN_CTRL
RXTX
PRE_PD
PA_N_PD
PA_P_PD
DAC_LPF_PD
XOSC16M_PD
RXBPF_CAL_PD
CHP_PD
FS_PD
ADC_PD
VGA_PD
RXBPF_PD
LNAMIX_PD
Field Name
-
VGA_GAIN_OE
VGA_GAIN [6:0]
LNAMIX_GAINMODE_O
[1:0]
LNAMIX_GAINMODE
[1:0]
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
0
0
0x7F
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
R/W
W0
R/W
R/W
R/W
R
SmartRF
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
frontend bias.
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 gainmode selected by
the AGC or overridden by the LNAMIX_GAINMODE_O setting.
®
CC2420
Page 73 of 85