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參數(shù)資料
| 型號(hào)： | GA3222 |
| 廠商： | Gennum Corporation |
| 英文描述： | Advanta-TM ADRO-TM - Enabled DSP System |
| 中文描述： | 埃德瓦塔-商標(biāo)化作-商標(biāo)- DSP系統(tǒng)啟用 |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 291K |
| 代理商： | GA3222 |
GA3222 Preliminary Data Sheet
34477 - 0
February 2006
16 of 21
7.13 Power-On/Power-Off Behavior and Low Battery Indicator
During power-on, the Advanta hybrid is held in a reset state until the supply voltage
(Vb) reaches a turn-on threshold. A small portion of the hybrid's internal control
logic turns on and monitors the voltage to determine if the supply is stable. Once
the supply is stable, the entire hybrid is activated and loads its configuration.
Finally, the audio output turns on by smoothly transitioning to the expected output
level.
During normal operation, when a low battery condition (below low battery
threshold) is detected, the Advanta hybrid sends out a series of beeps (of
configurable length and length) to indicate that the battery is low. This will repeat
at a regular interval (configurable from 10 seconds to 10 hours) until the device
reaches the turn-off threshold.
The low battery threshold is configurable from between 1.0V and 1.2V in 10mV
increments.
If Vb drops below the turn-off threshold then the Advanta hybrid is returned to its
reset state and the audio output is muted. After a reset due to a low battery or a
sudden supply transient, the recovery behavior of Venture is determined by the
selectable reset mode through the Calconfig application.
There are four selectable reset modes as follows:
1. Shallow-reset mode, allows the Advanta hybrid to immediately restart
when the supply voltage rises above the turn-ON threshold, after a low
battery shutdown or transient shutdown. The device restarts in the memory
that was last active when the shut down occurred. In summary, the device
functions until the supply voltage drops below the turn-OFF threshold, and
recovers when the device rises above the turn-ON threshold again.
2. Deep-reset mode, does not allow the Advanta hybrid to restart after a low
battery shutdown or transient shutdown. Once a shut down occurs (i.e.
once the supply voltage drops below the turn-OFF threshold), the device
remains off until the supply voltage drops below approximately 0.3V and
subsequently rises above the turn-ON threshold. In order for the supply to
drop below 0.3V, the battery should be disconnected. Upon reconnecting
the battery (preferably a new battery) the supply voltage rises above the
turn-ON threshold, and subject to the supply being stable, the device
restarts.
3. Mixed mode, is a combination of modes 1 and 2. The device starts up in
shallow-reset mode initially, and then changes over to deep reset mode
after five minutes.
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