CC2500-RTR1 datasheet(20/99 Pages) TI1

20 / 99 page

CC2500

SWRS040C

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 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

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: 1.5mA.

Lowest power mode. Most

Typ. current consumption

400nA, or 900nA when

wake-on-radio (WOR) is

enabled.

All register values are

retained. Typ. current

consumption; 0.16mA.

Used for calibrating frequency

synthesizer upfront (entering

receive or transmit mode can

then be done quicker).

Transitional state. Typ. current

consumption: 7.4mA.

Frequency synthesizer is turned on, can optionally be

calibrated, and then settles to the correct frequency .

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.

Typ. current

consumption:

from 13.3mA (strong

input signal) to 16.6mA

(weak input signal).

Optional transitional state. Typ.

current consumption: 7.4mA.

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.

In FIFO-based modes,

reception is turned off and

this state entered if the RX

FIFO overflows. 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)

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 of

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 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-RTR1 数据表(PDF) 20 Page - Texas Instruments

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