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CC2520 Datasheet(PDF) 19 Page - Texas Instruments

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Part # CC2520
Description  2.4 GHZ IEEE 802.15.4/ZIGBEE RF TRANSCEIVER
PDF  133 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CC2520 Datasheet(HTML) 19 Page - Texas Instruments

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CC2520 DATASHEET
2.4 GHZ IEEE 802.15.4/ZIGBEE® RF TRANSCEIVER
SWRS068 – DECEMBER 2007
WWW.TI.COM
19
5.10
Low-Current Mode RX
Applications that spend more time waiting for an input
signal than actually receiving it, might benefit from using
the special low-current RX mode. This mode draws less
current at the expense of sensitivity.
Note that when using this mode, neither RSSI nor CCA
is valid. This means that these settings can not be used
in conjunction with STXONCCA, for instance. Also note
that the interferer rejection will drop at stronger input
signal levels compared to when using the regular
recommended settings.
Important: The low-current RX mode is only valid from -40 to 85ºC !
5.10.1 Low-Current RX Mode Parameters
TA =25°C, VDD=3.0 V, fc=2440 MHz if nothing else stated. All parameters measured on Texas Instruments’ CC2520 EM 2.1 reference design with 50 Ω load
.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
RX current
Wait for sync
18.8
mA
Sensitivity
[2] requires -85 dBm
-90
dBm
Wanted signal 3 dB above the sensitivity level, 802.15.4 modulated
interferer at 802.15.4 channels:
±5 MHz from wanted signal. [2] requires 0 dB
52
dB
±10 MHz from wanted signal. [2] requires 30 dB
54
dB
Interferer Rejection
±20MHz or above.
55
dB
Table 1: Low-current RX mode. Use in addition to regular recommended settings.
Register
Setting (hex)
Comment
RXCTRL
33
Reduces sensitivity and current consumption
FSCTRL
12
Reduces current consumption and valid temperature range
AGCCTRL2
EB
Reduces sensitivity and current consumption
INTERFERER REJECTION (802.15.4 INTERFERER) VS
CARRIER LEVEL WHEN USING RX_LOCUR
0
20
40
60
-87
-78
-69
-60
-51
CARRIER LEVEL (dBm)



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