CC2420 Datasheet, PDF (74/92 Pages) List of Unclassifed Manufacturers – 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver

CC2420
MANAND (0x21) - Manual signal AND override register¹
Bit
15
14
13
Field Name
VGA_RESET_N
BIAS_PD
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
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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
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.
1 _{For some important signals the value used by analog and digital modules can be overridden manually. This is done}
as follows for the hypothetical important signal IS:
IS_USED = (IS * IS_AND_MASK) + IS_OR_MASK,
using boolean notation.
The AND-mask and OR-mask for the important signals listed resides in the MANAND and MANOR registers,
respectively.
Examples:
• Writing 0xFFFE to MANAND and 0x0000 to MANOR will force LNAMIX_PD≡0 whereas all other signals will be
unaffected.
• Writing 0xFFFF to MANAND and 0x0001 to MANOR will force LNAMIX_PD≡1 whereas all other signals will be
unaffected.
SWRS041B
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