[elektro] Micro USB toltes, meg nem tudunk mindent

[Szali Sandor]

flaist wrote:
> A 4-es láb nem azt mondja OTG-s eszkoznek , hogy master (van tápja)
> vagy slave (nincs tápja) eszköz van rádugva?
> A tápon kívül persze a kommunikációt is meghatározza.
> De lehet, hogy ez nem igaz!?.

Lehet, az egyik az mindig micro-a? [szogletes] a masik az micro-b?
[kerekitett sarku]
Ilyen OTG-s cuccot meg nem is lattam. gondolom tableteken van.

Az en gagyi kabelem az valszeg az ellenallas miatt nem tolt, a jo kabel 2
ere osszesen olyan 0.4ohm korul van, ennek meg 3 ohm.

de az eredeti foldhurok problemara visszaterve, hova is szoktak ellneallast
betenni foldhurok megszuntetes celjabol? a jelvezetek testjebe lehet, van
ertelme problakozni?
mar ket kis jeltrafoba is kezdenek belenyugodni :)


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The OTG cable has a micro-A plug on one side, and a micro-B plug on the
other (it cannot have two plugs of the same type). OTG adds a fifth pin to
the standard USB connector, called the ID-pin; the micro-A plug has the ID
pin grounded, while the ID in the micro-B plug is floating. The device that
has a micro-A plugged in becomes an OTG A-device, and the one that has
micro-B plugged becomes a B-device. The type of the plug inserted is
detected by the state of the pin ID .

Three additional ID pin states are defined[4] at the nominal resistance
values of 124 kΩ, 68 kΩ, and 36.5 kΩ, with respect to the ground pin. These
permit the device to work with aUSB Accessory Charger Adapter which allows
the OTG device to be attached to both a charger and another device
simultaneously.[6] These three states are used in the cases of:

  a.. A charger and either no device or an A-device that is not asserting
VBUS (not providing power) are attached. The OTG device is allowed to charge
and initiate SRP but not connect.[6]
  b.. A charger and an A-device that is asserting VBUS (is providing power)
are attached. The OTG device is allowed to charge and connect but not
initiate SRP.[6]
  c.. A charger and a B-device are attached. The OTG device is allowed to
charge and enter host mode.[6]
USB 3.0 introduced a backwards compatible, SuperSpeed extension of the
Micro-AB receptacle and Micro-A and Micro-B plugs. These contain all of the
pins in the USB 2.0 Micro and use the ID pin to identify the A-device and
B-device roles. Additionally they contain the additional SuperSpeed pins.