CC2420 Chipcon AS, CC2420 Datasheet - Page 72

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

MANAND (0x21) - Manual signal AND override register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
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:
•
•
Chipcon AS SmartRF ® CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
For some important signals the value used by analog and digital modules can be overridden manually. This is done
Bit
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 MANOVR will force LNAMIX_PD≡1 whereas all other signals will be
unaffected.
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
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
SmartRF
Description
The VGA_RESET_N signal is used to reset the peak detectors in
the VGA in the RX chain.
Reserved, write as 0
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.
1
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CC2420
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