CC2430 Datasheet, PDF (223/234 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
16 Voltage Regulators
The CC2430 includes two low drop-out
voltage regulators. These are used to
provide a 1.8 V power supply to the
CC2430 analog and digital power supplies.
Note: The voltage regulators should not be
used to provide power to external circuits
because of limited power sourcing
capability and also due to noise
considerations.
The analog voltage regulator input pin
AVDD_RREG is to be connected to the
unregulated 2.0 to 3.6 V power supply.
The regulated 1.8 V voltage output to the
analog parts, is available on the
RREG_OUT pin. The digital regulator input
pin AVDD_DREG is also to be connected to
the unregulated 2.0 to 3.6 V power supply.
The output of the digital regulator is
connected internally within the CC2430 to
the digital power supply.
The voltage regulators require external
components as described in section 11 on
page 29.
17 Evaluation Software
Chipcon provides users of CC2430 with a
software program, SmartRF^® Studio,
which may be used for radio performance
16.1 Voltage Regulators Power-on
The analog voltage regulator is disabled
by setting the RF register bit
RFPWR.RREG_RADIO_PD to 1. When the
analog voltage regulator is powered-on by
clearing the RFPWR.RREG_RADIO_PD bit,
there will be a delay before the regulator is
enabled. This delay is programmable
through the RFPWR RF register. The
interrupt flag RFIF.IRQ_RREG_PD is set
when the delay has expired. The delayed
power-on can also be observed by polling
the
RF
register
bit
RFPWR.ADI_RADIO_PD.
The digital voltage regulator is disabled
when the CC2430 is placed in power
modes PM2 or PM3 (see section 13.10).
When the voltage regulators are disabled,
register and RAM contents will be retained
while the unregulated 2.0 to 3.6 power
supply is present.
and functionality evaluation. SmartRF^®
Studio runs on Microsoft Windows 95/98
and Microsoft Windows NT/XP/2000.
SmartRF^® Studio can be downloaded from
Chipcon’s
web
page:
http://www.chipcon.com
CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A
Page 223 of 232