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MC13224VR2 Fiches technique(PDF) 11 Page - Freescale Semiconductor, Inc

No de pièce MC13224VR2
Description  Advanced ZigBee?? Compliant Platform-in-Package (PiP) for the 2.4 GHz IEEE짰 802.15.4 Standard
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC13224VR2 Fiches technique(HTML) 11 Page - Freescale Semiconductor, Inc

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MC13224V Technical Data, Rev. 1.2
Freescale Semiconductor
11
programmed parameters and have selectable sizes of RAM retention. Hibernate has lowest power,
but Doze allows high accuracy sleep timing. The CRM manages the recovery from low power,
similar to power-up from reset, providing regulator and clock management.
— Wake-up can be based on external interrupts through 4 KBI inputs
— Wake-up can be from internal interrupts
— Wake-up can be based on an RTI (wake-up) timer.
The RTI timer has two possible frequency sources that provide a very low power wake-up option
from sleep
— One option is an onboard, low accuracy 2 kHz oscillator
— A second option is to add an external 32.768 kHz crystal for the RTI clock source
— A 32-bit timer allows greater than a 36.4 hour wake-up delay with the 32.768 crystal oscillator
Other features of the CRM:
— An optional COP watchdog timer to monitor CPU program activity
— A programmable software reset
2.6.3
Optional Buck Regulator
For battery based applications, an optional buck regulator is provided to maximize battery life. Figure 4
shows the configuration of the buck regulator versus the normal connection. An onboard MOSFET is used
as a switch with an external 100
μH inductor and 10μF capacitor when the buck regulator is enabled.
The buck regulator drops the higher battery voltage to 1.8 - 2.0 Vdc that is applied to the onboard linear
regulators. This allows lower net current from the battery to maximize the life of the battery.
Figure 4. Optional Buck Regulator
2.6.4
Battery Detect
An optional feature of the ADC module is battery voltage detect. Programmable thresholds are provided
for an ADC analog sample channel to monitor the battery high voltage and battery low voltage. This
feature can be used as a trigger to provide low battery indication, protection for data that may be lost due
to end-of-life for the battery, monitoring charging, and controlling buck regulator operation.
VBATT
COIL_BK
LR EG_BK_F B
VDD
NC
LREG_BK_F B
VDD
L2
100uH
C2
10uF
COIL_BK
VBATT
Normal Operation
D1
DIODE SCHOTTKY
Buck Regulator Enabled


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