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MC13883 bảng dữ liệu(PDF) 3 Page - Freescale Semiconductor, Inc

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Giải thích chi tiết về linh kiện  Integrated Charger USB Interface
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Introduction
MC13883 Technical Data, Rev. 3
Freescale Semiconductor
3
1.2
Power Overview
1.2.1
Charging
The MC13883 allows charging of the phone via the mini-USB VBUS pin. This pin sources power from a
variety of devices including wall chargers and carkits, as well as sources that traditionally are not used in
charging. Specifically, the MC13883 allows the phone to be charged from a PC via a USB port. While this
is a very useful feature from an end-user perspective, it is a feature that adds some additional requirements
to the bus due to the unique limitations and requirements the USB specification places on devices that are
attached to a USB port. The MC13883 simplifies the task of identifying whether a PC or a “traditional”
charger is attached to the phone, allowing for a fairly simple methodology for handling these situations-a
methodology that is not burdensome to the phone in terms of hardware or software cost and complexity.
The charge circuitry can be configured as “dual path” charging. This means the power from the charge
supply is routed simultaneously to both the battery for charging and the phone B+ point to operate the
phone. It can also be configured for “single path” charging, in which case charge power is only routed to
the battery and from the battery to the phone's B+ point. Or it can be configured as "serial path", in which
case the charger powers the phone and a special trickle-charge path charges a deeply discharged battery.
1.2.2
Over-Voltage/Over-Current Protection and Reverse Charge
Overview
The MC13883 has built-in over-voltage protection for protecting the phone from faulty (high voltage)
charging sources. In addition, the MC13883 IC has the ability to place the charge path in reverse
mode-allowing power to be sourced to the VBUS pin from the battery. This can be used to support
phone-powered devices as described in the CEA-936-A standard. In order to protect the phone from short
circuit conditions on the external pins, this path also has built-in over-current protection.
1.2.3
USB Voltage Generation
In addition to providing power to the phone to charge the battery and generate the main phone supply, the
MC13883 also generates the various voltage supplies needed to support USB OTG. This includes an
internal regulator to supply the USB transceiver (VUSB) as well as a 5V linear regulator to provide power
out through the VBUS pin to support SRP—Session Request Protocol—a basic requirement of USB OTG.
1.3
Connectivity Overview
Various self powered devices (SPD) and phone powered devices (PPD) may be connected to the MC13883
interface. The phone needs to properly detect and identify each of these devices.
There are four signaling modes that the MC13883 bus supports: two digital data modes and two analog
audio modes. Two data modes are standard USB signaling and UART signaling. Two audio modes are
mono signaling and stereo signaling. The USB signaling follows the protocol defined in the USB 2.0
specification. UART and audio signaling follow the protocol defined in the CEA-936-A Carkit
specification.


Số phần tương tự - MC13883

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Mô tả tương tự - MC13883

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