參數(shù)資料
型號(hào)： 0W888-002-XTP
廠商： ON SEMICONDUCTOR
元件分類： 數(shù)字信號(hào)處理
英文描述： BelaSigna 250 - 16 bit Audio Processor, Full Stereo 2-in, 2-out; Package: LFBGA 64, 7x7; No of Pins: 64; Container: Tape and Reel; Qty per Container: 1500
中文描述： 0-BIT, 50 MHz, MIXED DSP, PBGA64
封裝： 7 X 7 MM, GREEN, LFBGA-64
文件頁(yè)數(shù)： 15/34頁(yè)
文件大?。?/td> 935K
代理商： 0W888-002-XTP
Rev. 7 | Page 22 of 34 | www.onsemi.com
BelaSigna 250
Boot ROM
Program Memory
EEPROM
SDA
MDA
FAT
Bootloader
Application
Boot ROM
Program Memory
EEPROM
SDA
MDA
FAT
Bootloader
Application
Bootloader
Stage 1:
Boot ROM loads Bootloader
from EEPROM to Program
Memory
Stage 2:
Bootloader loads Application from
EEPROM to Program Memory, X
Memory, and Y Memory
Boot ROM
Program Memory
EEPROM
SDA
MDA
FAT
Bootloader
Application
Bootloader
Stage 3:
Application loaded and running
Application
Time
Figure 12: Booting Sequence
3.6.3. Power Management Strategy
BelaSigna 250 has a built-in power management unit that guarantees valid system operation under any voltage supply condition to
prevent any unexpected audio output as the result of any supply irregularity. The unit constantly monitors the power supply and shuts
down all functional units (including all units in the audio path) when the power supply voltage goes below a level at which point valid
operation can no longer be guaranteed.
The power supply operation can be seen in Figure 13. Once the supply voltage rises above the startup voltage of the internal regulator
that supplies the digital subsystems (VDDCSTARTUP) and remains there for the length of time TPOR, a POR will occur. If the supply is
consistent, the internal system voltage will then remain at a fixed nominal voltage (VDDCNOMINAL). If a spike occurs that causes the
voltage to drop below the shutdown internal system voltage (VDDCSHUTDOWN), the system will shut down. If the voltage rises again
above the startup voltage and remains there for the length of time TPOR, a POR will occur. If operating directly off a battery, the system
will not power down until the voltage drops below the VDDCSHUTDOWN voltage as the battery dies. This prevents unwanted resets when
the voltage is just on the edge of being too low for the system to operate properly because the difference between VDDCSTARTUP and
VDDCSHUTDOWN prevents oscillation around the VDDCSHUTDOWN point.
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