Texas Instruments CC2500 User Manual

CC2500
S
WRS040
C
Page
20
of
89
Transmit mode
Receive mode
Idle
Manual freq
.
synth
.
calibration
RX FIFO
overflow
TX FIFO
underflow
Frequency
synthesizer on
SFSTXON
SRX or wake
-
on
-
radio
(
WOR
)
STX
STX
STX or RXOFF
_
MODE
=
10
RXOFF
_
MODE
=
00
SFTX
SRX or TXOFF
_
MODE
=
11
SIDLE
SCAL
SFRX
Idle
TXOFF
_
MODE
=
00
SFSTXON or RXOFF
_
MODE
=
01
SRX or STX or SFSTXON or wake
-
on
-
radio
(
WOR
)
Sleep
SPWD or wake
-
on
-
radio
(
WOR
)
Crystal
oscillator off
SXOFF
CSn
=
0
CSn
=
0
TXOFF
_
MODE
=
01
Frequency
synthesizer startup
,
optional calibration
,
settling
Optional freq
.
synth
.
calibration
Default state when the radio is not
receiving or transmitting
.
Typ
.
current consumption
:
1
.
5
mA
.
Lowest power mode
.
Most
register values are retained
.
Typ
.
current consumption
400
nA
,
or
900
nA when
wake
-
on
-
radio
(
WOR
)
is
enabled
.
All register values are
retained
.
Typ
.
current
consumption
;
0
.
16
mA
.
Used for calibrating frequency
synthesizer upfront
(
entering
receive or transmit mode can
then be done quicker
).
Transitional state
.
Typ
.
current
consumption
:
7
.
4
mA
.
Frequency synthesizer is turned on
,
can optionally be
calibrated
,
and then settles to the correct frequency
.
Transitional state
.
Typ
.
current consumption
:
7
.
4
mA
.
Frequency synthesizer is on
,
ready to start transmitting
.
Transmission starts very
quickly after receiving the
STX command strobe
.
Typ
.
current consumption
:
7
.
4
mA
.
Typ
.
current consumption
:
11
.
1
mA at
-
12
dBm output
,
15
.
1
mA at
-
6
dBm output
,
21
.
2
mA at
0
dBm output
.
Typ
.
current
consumption
:
from
13
.
3
mA
(
strong
input signal
)
to
1
6
.
6
mA
(
weak input s
i
gnal
).
Optional transitional state
.
Typ
.
current consumption
:
7
.
4
mA
.
In FIFO
-
based modes
,
transmission is turned off
and this state entered if the
TX FIFO becomes empty in
the middle of a packet
.
Typ
.
current consumption
:
1
.
5
mA
.
In FIFO
-
based modes
,
reception is turned off and
this state entered if the RX
FIFO overflows
.
Typ
.
current consumption
:
1
.
5
mA
.
Figure
5
: Simplified
S
tate
D
iagram with
T
ypical
U
sage and
C
urrent
C
onsumption at 250
kBaud
D
ata
R
ate and
MDMCFG2.DEM_DCFILT_OFF
=1
(
current optimized
)
9
Configuration Software
CC2500
can
be configured using the SmartRF

Studio software
[5]
.
The SmartRF

Studio
software is highly recommended for obtaining
optimum register settings, and for evaluating
performance and functionality. A screenshot o
f
the SmartRF

Studio user interface for
CC2500
is shown in
Figure
6
.
After chip reset, all the registers have default
values as shown in the tables
in Section
32
.
The op
timum register setting might differ from
the default value. After a reset all registers that
shall be different from the default value
therefore needs to be programmed through
the SPI interface.

Texas Instruments CC2500 Specifications

General

Brand	Texas Instruments
Model	CC2500
Category	Transceiver
Language	English