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参数资料
| 型号： | PC13892AJVK |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA139 |
| 封装： | 7 X 7 MM, 0.50 MM PITCH, ROHS COMPLIANT, PLASTIC, MO-195AD, MABGA-139 |
| 文件页数： | 37/67页 |
| 文件大小： | 2571K |
| 代理商： | PC13892AJVK |
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Analog Integrated Circuit Device Data
42
Freescale Semiconductor
13892
FUNCTIONAL DEVICE OPERATION
Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not
available from Freescale for import or sale in the United States prior to September 2010: MC13892*VK and MC13892*VL in 139, 186 MAPBGA packages.
FUNCTIONAL DEVICE OPERATION
PROCESSOR LOGIC INTERFACING
CLOCK GENERATION
A system clock is generated for internal digital circuitry as
well as for external applications utilizing the clock output pins.
A crystal oscillator is used for the 32.768 kHz time base and
generation of related derivative clocks. If the crystal oscillator
is not running (for example, if the crystal is not present), an
internal 32 kHz oscillator will be used instead.
Support is also provided for an external Secure Real Time
Clock (SRTC), which may be integrated on a companion
system processor IC. For media protection in compliance
with Digital Rights Management (DRM) system
requirements, the CLK32KMCU can be provided as a
reference to the SRTC module, where tamper protection is
implemented.
The internal 32kHz oscillator is an integrated backup for
the crystal oscillator and provides a 32.768 kHz nominal
frequency at 20% accuracy if running. The internal oscillator
only runs if a valid supply is available at BP and would not be
used as long as the crystal oscillator is active. In absence of
a valid supply at the BP supply node (for instance due to a
dead battery), the crystal oscillator continues running
supplied from the coin cell battery until the coin cell is
depleted. All control functions will run off the crystal derived
frequency, occasionally referred to as “32 kHz” for brevity’s
sake.
The crystal oscillator has been optimized for use in
conjunction with the Micro Crystal CC7V-T1A-
32.768 kHz-9.0 pF-30 ppm or equivalent (such as the
Micro Crystal CC5V-T1A or Epson FC135) is capable of
handling its parametric variations.
The electrical characteristics of the 32 kHz crystal
crystal characteristics noted previously. The oscillator
accuracy depends largely on the temperature characteristics
of the used crystal. Application circuits can be optimized for
required accuracy by adapting the external crystal oscillator
network (via component accuracy and/or tuning).
Additionally, a clock calibration system is provided to
adjust the 32,768 cycle counter that generates the 1.0 Hz
timer and RTC registers; see the RTC section for more detail.
SRTC SUPPORT AND VSRTC
When configured for DRM mode (SPI bit DRM=1), the
CLK32KMCU driver will be kept enabled through all
operational states to ensure that the SRTC module always
has its reference clock. If DRM=0, the CLK32KMCU driver
will not be maintained in the Off state.
It is also necessary to provide a means for the processor
to do an RTC initiated wake-up of the system if it has been
programmed for such capability. This can be accomplished
by connecting an open drain NMOS driver to the PWRON pin
of 13892 so that it is in effect a parallel path for the power key.
The 13892 will not be able to discern the turn on event from
a normal power key initiated turn on, but the processor should
have the knowledge since the RTC initiated turn on is
generated locally.
The VSRTC regulator provides the CLK32KMCU output
level. It is also used to bias the Low Power SRTC domain of
the SRTC module integrated on certain FSL processors. The
VSRTC regulator is enabled as soon as the RTCPORB is
detected. The VSRTC cannot be disabled.
VSRTC
REAL TIME CLOCK
A Real Time Clock (RTC) is provided with time and day
counters as well as an alarm function. The RTC utilizes the
32.768 kHz crystal oscillator for the time base, and is
powered by the coin cell backup supply when BP has
dropped below operational range. In configurations where
the SRTC is used, the RTC can be disabled to conserve
current drain by setting the RTCDIS bit to a 1 (defaults on at
power up).
TIME AND DAY COUNTERS
The 32.768 kHz clock is divided down to a 1.0 Hz time tick
which drives a 17 bit Time Of Day (TOD) counter. The TOD
counter counts the seconds during a 24 hour period from 0 to
86,399 and will then roll over to 0. When the roll over occurs,
it increments the 15 bit DAY counter. The DAY counter can
count up to 32767 days. The 1.0 Hz time tick can be used to
generate a 1.0 Hz interrupt if unmasked.
TIME OF DAY ALARM
A Time Of Day Alarm (TODA) function can be used to turn
on the application and alert the processor. If the application
is already on, the processor will be interrupted. The TODA
and DAYA registers are used to set the alarm time. When the
TOD counter is equal to the value in TODA and the DAY
counter is equal to the value in DAYA, the TODAI interrupt
will be generated.
TIMER RESET
As long as the supply at BP is valid, the real time clock will
be supplied from VCORE. If not, it can be backed up from a
coin cell via the LICELL pin. When the backup voltage drops
below RTCUVDET, the RTCPORB reset signal is generated
and the contents of the RTC will be reset. Additional registers
backed up by coin cell will also reset with RTCPORB. To
inform the processor that the contents of the RTC are no
longer valid due to the reset, a timer reset interrupt function
is implemented with the RTCRSTI bit.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PC13892AJVKR2 | 制造商:Freescale Semiconductor 功能描述:POWER MGMT IC - Tape and Reel |
| PC13892AJVL | 制造商:Freescale Semiconductor 功能描述:5/28V BCK/BST PMUIC - Bulk |
| PC13892AJVLR2 | 制造商:Freescale Semiconductor 功能描述:5/28V BCK/BST PMUIC - Tape and Reel |
| PC13892BJVL | 制造商:Freescale Semiconductor 功能描述:5/28V BCK/BST PMUIC - Trays |
| PC13892JVK | 制造商:Freescale Semiconductor 功能描述:POWER MGMT IC - Bulk |
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