CC115LRGPR.B datasheet(29/74 Pages) TI2

29 / 74 page

CC115L

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SWRS105B – MAY 2011 – REVISED JUNE 2014

NOTE

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

the user wants to reset the CC115L after this, it is only necessary to issue an SRES

command strobe.

5.10.2 Crystal Control

The

crystal

oscillator

(XOSC)

either

automatically

controlled

always

on,

MCSM0.XOSC_FORCE_ON is set.

In the automatic mode, the XOSC 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 the 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.

If the XOSC is forced on, the crystal will always stay on even in the SLEEP state.

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.

5.10.3 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.

Detailed Description

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CC115LRGPR.B Datasheet(PDF) 29 Page - Texas Instruments