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參數(shù)資料
| 型號： | SI3225PPT0-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 55/112頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL W/SI3200 INTERFACE |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | ProSLIC® |
| 類型： | ADC + DAC，編碼解碼器，前端 |
| 適用于相關(guān)產(chǎn)品： | Si3225 |
| 所含物品： | 評估板和光盤 |
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Si3220/25 Si3200/02
Rev. 1.3
47
Not
Recommended
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The output of the debounce filter remains in its present
state unless the input remains in the opposite state for
the entire period of time programmed by the loop
closure debounce interval, LONGDBI. If the debounce
interval is satisfied, the LONGHI bit is set to indicate
that a valid ground key event has occurred.
When the Si3220/25 detects a ground key event, the
linefeed automatically transitions from the TIP-OPEN
(or RING-OPEN) state to the FORWARD-ACTIVE (or
REVERSE-ACTIVE) state. However, this automatic
state transition is triggered by the LCR bit becoming
active (i.e., =1), and not by the LONGHI bit.
While ILONG is used to generate the LONGHI status bit,
a transition from TIP-OPEN to the FORWARD-ACTIVE
state (or from the RING-OPEN to the REVERSE-
ACTIVE state) occurs when the RING terminal (or TIP
terminal) is grounded and is based on the LCR bit and
implicitly on exceeding the LCROFFHK threshold.
As an example of ground key detection, suppose that
the Si3220/25 has been programmed with the current
values shown in Table 26.
ILONG, LCR, LONGHI, and CMHIGH is as shown in
Table 27. The entries under “Loop State” indicate the
condition of the loop, as determined by the equipment
terminating the loop. The entries under “LINEFEED
Setting” indicate the state initially selected by the host
CPU (e.g., TIP-OPEN) and the automatic transition to
the FORWARD-ACTIVE state due to a ground key
event (when RING is connected to GND). The transition
from state #2 to state #3 in Table 27 is the automatic
transition from TIP-OPEN to FWD-ACTIVE in response
to LCR = 1.
Table 26. Settings for Ground Key Example
ILIM
21 mA
LCROFFHK
14 mA
LCRONHK
10 mA
LONGHITH
7 mA
LONGLOTH
5 mA
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| SI3225PPT-EVB | 制造商:SILABS 制造商全稱:SILABS 功能描述:EVALUATION BOARD FOR THE Si3225 DUAL PROSLIC |
| SI3225PPTX-EVB | 功能描述:音頻 IC 開發(fā)工具 Si3225 Eval Board RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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