IC RF TXRX SNGL-CHIP LP 20-QFN

CC2500-RTR1

Manufacturer Part NumberCC2500-RTR1
DescriptionIC RF TXRX SNGL-CHIP LP 20-QFN
ManufacturerTexas Instruments
CC2500-RTR1 datasheet
 


Specifications of CC2500-RTR1

Frequency2.4GHzData Rate - Maximum500kBaud
Modulation Or Protocol2-FSK, ASK, GFSK, MSK, OOKApplicationsISM, SRD
Power - Output-30dBm ~ 10dBmSensitivity-104dBm
Voltage - Supply1.8 V ~ 3.6 VCurrent - Receiving17mA
Current - Transmitting21.5mA @ 1 dBmData InterfacePCB, Surface Mount
Antenna ConnectorPCB, Surface MountOperating Temperature-40°C ~ 85°C
Package / Case20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFNOperating Temperature (min)-40C
Operating Temperature (max)85COperating Temperature ClassificationIndustrial
Product Depth (mm)4mmProduct Length (mm)4mm
Operating Supply Voltage (min)1.8VOperating Supply Voltage (typ)2.5/3.3V
Operating Supply Voltage (max)3.6VFor Use With296-24121 - DEV WRLSS TOOL FOR MSP430296-23125 - TARGET BRD WIRELESS EZ430-RF2500296-23031 - DEV WRLSS TOOL FOR MSP430/CC2500296-22903 - KIT EVAL MODULE FOR CC2500296-23077 - KIT DEV FOR CC2500/CC2550
Lead Free Status / RoHS StatusContains lead / RoHS non-compliantMemory Size-
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Page 36/96

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IOCFGx.GDOx_CFG=14 and in the status
register bit PKTSTATUS.CS.
Other uses of Carrier Sense include the TX-if-
CCA function (see Section 17.5 on page 37)
and the optional fast RX termination (see
Section 19.7 on page 43).
CS can be used to avoid interference from e.g.
WLAN.
17.4.1 CS Absolute Threshold
The absolute threshold related to the RSSI
value depends on the following register fields:
AGCCTRL2.MAX_LNA_GAIN
AGCCTRL2.MAX_DVGA_GAIN
AGCCTRL1.CARRIER_SENSE_ABS_THR
AGCCTRL2.MAGN_TARGET
For a given AGCCTRL2.MAX_LNA_GAIN and
AGCCTRL2.MAX_DVGA_GAIN
absolute threshold can be adjusted ±7 dB in
steps
of
1
CARRIER_SENSE_ABS_THR.
The MAGN_TARGET setting is a compromise
between
blocker
tolerance/selectivity
sensitivity. The value sets the desired signal
level in the channel into the demodulator.
Increasing this value reduces the headroom
for blockers, and therefore close-in selectivity.
It is strongly recommended to use SmartRF
Studio
[5]
to
generate
MAGN_TARGET setting.
Table 26 and Table 27 show the typical RSSI
readout values at the CS threshold at 2.4
kBaud and 250 kBaud data rate respectively.
The default CARRIER_SENSE_ABS_THR=0 (0
dB) and MAGN_TARGET=3 (33 dB) have been
used.
For other data rates the user must generate
similar tables to find
the CS absolute
threshold.
Table 26: Typical RSSI Value in dBm at CS
Threshold with Default MAGN_TARGET at 2.4
setting
the
dB
using
and
Table 27: Typical RSSI Value in dBm at CS
Threshold with Default MAGN_TARGET at 250
®
the
correct
If the threshold is set high, i.e. only strong
signals are wanted, the threshold should be
adjusted
MAX_LNA_GAIN
MAX_DVGA_GAIN value. This will reduce
power consumption in the receiver front end,
since the highest gain settings are avoided.
17.4.2 CS Relative Threshold
The relative threshold detects sudden changes
in the measured signal level. This setting is not
dependent on the absolute signal level and is
thus useful to detect signals in environments
with a time varying noise floor. The register
field AGCCTRL1.CARRIER_SENSE_REL_THR
is used to enable/disable relative CS, and to
select threshold of 6 dB, 10 dB or 14 dB RSSI
change
SWRS040C
MAX_DVGA_GAIN[1:0]
00
01
10
000
-99
-93
-87
001
-97
-90.5
-85
010
-93.5
-87
-82
011
-91.5
-86
-80
100
-90.5
-84
-78
101
-88
-82.5
-76
110
-84.5
-78.5
-73
111
-82.5
-76
-70
kBaud
MAX_DVGA_GAIN[1:0]
00
01
10
000
-96
-90
-84
001
-94.5
-89
-83
010
-92.5
-87
-81
011
-91
-85
-78.5
100
-87.5
-82
-76
101
-85
-79.5
-73.5
110
-83
-76.5
-70.5
111
-78
-72
-66
kBaud
upwards
by
first
reducing
value
and
then
Page 36 of 89
11
-81.5
-78.5
-76
-74
-72.5
-70
-67
-64
11
-78.5
-77.5
-75
-73
-70
-67.5
-65
-60
the
the