CC1150-RTY1 datasheet(28/67 Pages) TI1

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CSn

XOSC Stable

XOSC and voltage regulator switched on

SRES

40 µs

CC1150

SWRS037B – JANUARY 2006 – REVISED MARCH 2015

www.ti.com

Figure 5-13. Power-up with SRES

NOTE

The above reset procedure is only required just after the power supply is first turned on. If

the user wants to reset the CC1150 after this, it is only necessary to issue an SRES

command strobe.

It is recommended to always send a SRES command strobe on the SPI interface after power-on even

though power-on reset is used.

5.11.2 Crystal Control

The crystal oscillator is automatically turned on when CSn goes low. It will be turned off if the SXOFF or

SPWD command strobes are issued; the state machine then goes to XOFF or SLEEP respectively. This

can only be done from IDLE state. The XOSC will be turned off when CSn is released (goes high). The

XOSC will be automatically turned on again when 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 5.5.1.

Crystal oscillator start-up time depends on crystal ESR and load capacitances. The electrical specification

for the crystal oscillator can be found in Section 4.7.

5.11.3 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 be reprogrammed over the SPI interface.

5.11.4 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

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