1250 datasheet(13/50 Pages) TI

13 / 50 page

CC2550

Preliminary Data Sheet (rev. 1.1)

SWRS039

Page 13 of 51

Details of each configuration register can be

found in section 33, starting on page 32.

Figure 4 shows a simplified state diagram that

explains the main

CC2550 states, together with

typical usage and current consumption. For

detailed information on controlling the

CC2550

state machine, and a complete state diagram,

see section 23, starting on page 23.

Transmit mode

IDLE

Manual freq.

synth. calibration

TX FIFO

underflow

Frequency

synthesizer on

SFSTXON

STX

SFTX

SIDLE

SCAL

IDLE

TXOFF_MODE=00

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: 1.2mA.

Lowest power mode.

Typ. current consumption:

200nA.

All register values are

retained. Typ. current

consumption; 0.18mA.

Used for calibrating frequency

synthesizer upfront (entering

transmit mode can then be

done quicker). Transitional

state. Typ. current

consumption: 6.8mA.

Frequency synthesizer is turned on, can optionally be

calibrated, and then settles to the correct frequency.

Transitional state. Typ. current consumption: 4.7mA.

Frequency synthesizer is on,

ready to start transmitting.

Transmission starts very

quickly after receiving the

STX command strobe.Typ.

current consumption: 6.8mA.

Typ. current consumption:

12.8mA at -12dBm output,

16.4mA at -6dBm output,

22.8mA at 0dBm output.

Optional transitional state. Typ.

current consumption: 6.8mA.

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: 1.2mA.

Figure 4: Simplified state diagram, with typical usage and current consumption

16 Configuration Software

CC2550 can be configured using the SmartRF®

Studio software, available for download from

http://www.chipcon.com. 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

CC2550

is shown in Figure 5.

1250 Datasheet(PDF) 13 Page - Texas Instruments

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