CC115LRGPR datasheet(30/74 Pages) TI2

30 / 74 page

CC115L

SWRS105B – MAY 2011 – REVISED JUNE 2014

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5.10.4 Transmit Mode (TX)

Transmit mode is activated directly by the MCU by using the STX command strobe.

The frequency synthesizer must be calibrated regularly. CC115L has one manual calibration option (using

the

SCAL

strobe),

and

three

automatic

calibration

options

that

are

controlled

the

MCSM0.FS_AUTOCAL setting:

•

Calibrate when going from IDLE to TX (or FSTXON)

•

Calibrate when going from TX to IDLE automatically (not forced in IDLE by issuing an SIDLE strobe)

•

Calibrate every fourth time when going from TX to IDLE automatically (not forced in IDLE by issuing an

SIDLE strobe)

If the radio goes from TX to IDLE by issuing an SIDLE strobe, calibration will not be performed. The

calibration takes a constant number of XOSC cycles; see Table 5-5 for timing details regarding calibration.

When TX is active the chip will remain in the TX state until the current packet has been successfully

transmitted. Then the state will change as indicated by the MCSM1.TXOFF_MODE setting. The possible

destinations are:

•

IDLE

•

FSTXON: Frequency synthesizer on and ready at the TX frequency. Activate TX with STX

•

TX: Start sending preamble

The SIDLE command strobe can always be used to force the radio controller to go to the IDLE state.

5.10.5 Timing

5.10.5.1 Overall State Transition Times

The main radio controller needs to wait in certain states in order to make sure that the internal

analog/digital parts have settled down and are ready to operate in the new states. A number of factors are

important for the state transition times:

•

The crystal oscillator frequency, fxosc

•

OOK used or not

•

The data rate in cases where OOK is used

•

The value of the TEST0, TEST1, and FSCAL3 registers

Table 5-5 shows timing in crystal clock cycles for key state transitions.

Note that the TX to IDLE transition time is a function of data rate (fbaudrate). When OOK is used (that is,

FREND0.PA_POWER=001b), TX to IDLE will require 1/8×f baudrate longer times than the time stated in

Table 5-5.

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