Table of Contents
Advertisement
Default state when the radio is not
receiving or transmitting. Typ.
current consumption: 1.5mA.
Used for calibrating frequency
synthesizer upfront (entering
receive or transmit mode can
then be done quicker).
synth. calibration
Transitional state. Typ. current
consumption: 7.4mA.
Frequency synthesizer is on,
ready to start transmitting.
Transmission starts very
quickly after receiving the
STX command strobe.Typ.
current consumption: 7.4mA.
Typ. current consumption:
11.1mA at -12dBm output,
15.1mA at -6dBm output,
21.2mA at 0dBm output.
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: 1.5mA.
Figure 5: Simplified State Diagram with Typical Usage and Current Consumption at 250 kBaud
Data Rate and MDMCFG2.DEM_DCFILT_OFF=1 (current optimized)
9
Configuration Software
CC2500 can be configured using the SmartRF
Studio software [5]. The SmartRF
software is highly recommended for obtaining
optimum register settings, and for evaluating
performance and functionality. A screenshot of
Studio user interface for CC2500
the SmartRF
is shown in Figure 6.
SIDLE
SCAL
Manual freq.
SRX or STX or SFSTXON or wake-on-radio (WOR)
Frequency
synthesizer startup,
optional calibration,
SFSTXON
Frequency
synthesizer on
STX
STX
TXOFF_MODE=01
SFSTXON or RXOFF_MODE=01
STX or RXOFF_MODE=10
Transmit mode
SRX or TXOFF_MODE=11
TXOFF_MODE=00
Optional transitional state. Typ.
current consumption: 7.4mA.
TX FIFO
Optional freq.
underflow
synth. calibration
SFTX
Studio
SWRS040C
SPWD or wake-on-radio (WOR)
CSn=0
Idle
SXOFF
CSn=0
oscillator off
Frequency synthesizer is turned on, can optionally be
calibrated, and then settles to the correct frequency.
Transitional state. Typ. current consumption: 7.4mA.
settling
SRX or wake-on-radio (WOR)
Receive mode
RXOFF_MODE=00
SFRX
Idle
After chip reset, all the registers have default
values as shown in the tables in Section 32.
The optimum 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.
CC2500
Lowest power mode. Most
register values are retained.
Typ. current consumption
Sleep
400nA, or 900nA when
wake-on-radio (WOR) is
enabled.
All register values are
Crystal
retained. Typ. current
consumption; 0.16mA.
Typ. current
consumption:
from 13.3mA (strong
input signal) to 16.6mA
(weak input signal).
In FIFO-based modes,
reception is turned off and
RX FIFO
this state entered if the RX
overflow
FIFO overflows. Typ.
current consumption:
1.5mA.
Page 20 of 89
Advertisement
Table of Contents
