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參數(shù)資料
| 型號(hào)： | CBTL12131ET |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | DisplayPort multiplexer for bidirectional video in all-in-one computer systems |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PBGA64 |
| 封裝： | 6 X 6 MM, 0.80 MM HEIGHT, 0.50 MM PITCH, PLASTIC, MO-195, SOT543-1, TFBGA-64 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 215K |
| 代理商： | CBTL12131ET |
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CBTL12131
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1 — 25 February 2011
16 of 28
NXP Semiconductors
CBTL12131
DisplayPort multiplexer for bidirectional video
7.8 AUX channel bias and termination
The AUX lines of Port B can be biased and terminated in accordance with the DisplayPort
Interoperability Guidelines in accordance with the configuration for either a sink or source,
depending on which is required. The control input for the termination and bias are CMOS
inputs AUX_TERM_SRC and AUX_TERM_SNK.
Together with the state of PATH_SEL and HPD_B_FLT (the filtered, steady state of
HPD_B), these signals allow a detection scheme by which the system controller can
resolve different connection scenarios of the external DisplayPort connector at Port B:
Nothing is connected
An external source is connected
An external sink is connected (either with or without source detection being performed
by the sink)
An external, second all-in-one system (using a topology similar or equivalent to
CBTL12131)
At first connection time, the latter scenario may appear identical to the first. In this case,
AUX_TERM_SNK (which applies a 500 k
Ω pull-up on AUX_B_P line provided) can be
toggled HIGH in order to allow the other system to detect a connected sink, and configure
itself accordingly as a source.
Using AUX_TERM_SRC, the system controller is able to check whether the attached
device is a sink which is not asserting HPD (as some sinks will employ source detection
for power saving reasons). By applying the integrated 100 k
Ω pull-up and pull-down
resistors, the attached sink will detect a source and assert its HDP when it is ready.
When HPD_B_FLT is HIGH, this means the attached device is asserting HPD and
CBTL12131 will activate its source type 100 k
Ω termination resistors.
When PATH_SEL is HIGH, this means the internal DisplayPort sink (embedded panel) is
active, and its 1 M
Ω termination resistors will apply the correct AUX bias to represent a
sink device.
In the default condition (PATH_SEL, HPD_B_FLT and AUX_TERM_SNK/SRC are all
LOW), 4.7 M
Ω pull-down resistors are applied to the AUX_B pair, in order to avoid floating
conditions in case two similar systems are connected together.
When both AUX_TERM_SRC and AUX_TERM_SNK are HIGH, all integrated termination
resistors will be de-activated. For correct system operation, the system controller needs to
guarantee that AUX_TERM_SRC and AUX_TERM_SNK are never HIGH at the same
time, unless the external termination resistors are implemented.
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| CBTL12131ET,518 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 1.1 MUX BI-DRC VIDEO 1 DISPLAYPORT CONN RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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