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MC13224V データシート(PDF) 10 Page - Freescale Semiconductor, Inc

部品番号 MC13224V
部品情報  Advanced ZigBee?? Compliant Platform-in-Package (PiP) for the 2.4 GHz IEEE짰 802.15.4 Standard
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メーカー  FREESCALE [Freescale Semiconductor, Inc]
ホームページ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC13224V データシート(HTML) 10 Page - Freescale Semiconductor, Inc

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MC13224V Product Preview, Rev. 1.7
10
Freescale Semiconductor
Management control of onboard linear regulators and optional buck regulator
2.6.2.2
CRM Operation
The CRM has primary control of the entire system:
Reset and power up — After release of the hardware RESETB signal, the CRM will perform a
power up sequence of the MCU. The linear regulators and clock sources are managed for a graceful
start-up of the MCU and its resources. The radio is not powered until needed
Normal operation of MCU — The clock management of the MCU and its resources are controlled
by the CRM. The processor clock is programmable from low frequencies up to the maximum
reference frequency (13-26 MHz optional w/24 MHz standard) to allow the application to trade-off
processing speed versus power savings
Sleep modes and recovery — There are two sleep modes of Hibernate and Doze. The primary
difference is that Doze mode keeps the reference oscillator running. Both modes can retain critical
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 with 2 possible frequency sources provides 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.


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