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參數(shù)資料
| 型號(hào)： | EM2420TR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver |
| 中文描述： | 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee的射頻收發(fā)器 |
| 文件頁數(shù)： | 76/89頁 |
| 文件大?。?/td> | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 76 of 89
MANAND (0x21) - Manual signal AND override register
1
Bit
Field Name
Reset
R/W
Description
15
VGA_RESET_N
1
R/W
The VGA_RESET_N signal is used to reset the peak detectors in
the VGA in the RX chain.
14
BIAS_PD
1
R/W
Reserved, write as 0
13
BALUN_CTRL
1
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
1
R/W
RXTX signal: controls whether the LO buffers (0) or PA buffers
(1) should be used.
11
PRE_PD
1
R/W
Powerdown of prescaler.
10
PA_N_PD
1
R/W
Powerdown of PA (negative path).
9
PA_P_PD
1
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
1
R/W
Powerdown of TX DACs.
7
XOSC16M_PD
1
R/W
6
RXBPF_CAL_PD
1
R/W
Powerdown control of complex bandpass receive filter calibration
oscillator.
5
CHP_PD
1
R/W
Powerdown control of charge pump.
4
FS_PD
1
R/W
Powerdown control of VCO, I/Q generator, LO buffers.
3
ADC_PD
1
R/W
Powerdown control of the ADCs.
2
VGA_PD
1
R/W
Powerdown control of the VGA.
1
RXBPF_PD
1
R/W
Powerdown control of complex bandpass receive filter.
0
LNAMIX_PD
1
R/W
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 MANOVR will force LNAMIX_PD
≡
1 whereas all other signals will be
unaffected.
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