CC1150-RTR1 datasheet(32/67 Pages) TI

32 / 67 page

CC1150

SWRS037A

Page 32 of 60

CSn

goes low. The state machine will then go

to the IDLE state. The SO pin on the SPI

interface must be pulled low before the SPI

interface is ready to be used; as described in

Section 10.1 on page 19.

Crystal oscillator start-up time depends on

crystal ESR and load capacitances. The

electrical specification for the crystal oscillator

can be found in section 4.3 on page 8.

16.3

Voltage Regulator Control

The voltage regulator to the digital core is

controlled by the radio controller. When the

chip enters the SLEEP state, which is the state

with the lowest current consumption, the

voltage regulator is disabled. This occurs after

CSn

is released when a SPWD command

strobe has been sent on the SPI interface. The

chip is then in the SLEEP state. Setting CSn

low again will turn on the regulator and crystal

oscillator and make the chip enter the IDLE

state.

On the

CC1150, all register values (with the

exception of the MCSM0.PO_TIMEOUT field)

are lost in the SLEEP state. After the chip gets

back to the IDLE state, the registers will have

default

(reset)

contents

and

must

reprogrammed over the SPI interface.

16.4

Active Mode

The active transmit mode is activated by the

MCU by using the STX command strobe.

The frequency synthesizer must be calibrated

regularly.

CC1150 has one manual calibration

option (using the SCAL strobe), and three

automatic calibration options, controlled by the

MCSM0.FS_AUTOCAL

setting:

•

Calibrate when going from IDLE to TX

(or FSTXON)

•

Calibrate when going from TX to IDLE

•

Calibrate every fourth time when going

from TX to IDLE

The calibration takes a constant number of

XOSC cycles; see Table 20 for timing details.

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

indicated

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 preambles

The SIDLE command strobe can always be

used to force the radio controller to go to the

IDLE state. Note that if the radio goes from TX

to IDLE by issuing an SIDLE strobe, the

automatic calibration-when-going-from-TX-to-

IDLE will not be performed.

16.5

Timing

The radio controller controls most timing in

CC1150, such as synthesizer calibration and

PLL lock. Table 20 shows timing in crystal

clock cycles for key state transitions. Timing

from IDLE to TX is constant, dependent on the

auto calibration setting. The calibration time is

constant 18739 clock periods. Power on time

and XOSC start-up times are variable, but

within the limits stated in Table 6. Note that in

a frequency hopping spread spectrum or a

multi-channel protocol the calibration time can

be reduced from 721 µs to approximately 150

µs. This is explained in section 24.2.

CC1150-RTR1 Datasheet(PDF) 32 Page - Texas Instruments

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