Datasheet > F75204

F75204

更新时间： 2024-02-28 19:55:50

品牌	Logo	应用领域
精拓 - FINTEK		控制器
页数	文件大小	规格书
14页	648K
描述
USB Charger Controller

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中文翻译

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数据手册

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F75204 数据手册

F75204

6.1.2 Advance CDP Function

The F75204 featured an Advance CDP function to provide an always USB connectivity for

handheld devices. When non-CDP devices are connected to a CDP USB port, some might fail to

make connection with the USB host on a standard CDP port. To solve this problem, the Advance

CDP feature is able to switches the charging port automatically to SDP mode during handshaking, if

the attached device is a non-CDP device. This function can ensure a correct data connection when

non-CDP device is plugged in.

CDP is the abbreviation for Charging Downstream Port, which allows supported devices to do

fast charging (Maximum 1.5A) & data communication at the same time. The advance CDP solution

is able to disable CDP function while attached device is not support CDP function, and re-connect to

the attached device.

6.1.3 Full / Low Speed USB Devices Wake up

Traditional USB host charger may cut off the data linking path then disable the keyboard /

mouse wakeup function. To avoid the situation, the F75204 allows Full / Low speed USB devices to

wake up the system. In order to make sure the wake up function work properly, the F75204 won’t

cut off the D+ / D- data path of USB if the device attached is an full / low speed USB keyboard /

mouse. This feature allows most of keyboard / mouse to wake the system up normally.

6.1.4 External Chip Enable Signal – CEN (or CEN#)

The F75204 is equipped with a digital output signal pin – CEN (or CEN#), which allows users to

control the external power switch. To reduce the complexity, Fintek made this F75204 to supports

both active high / low types of power switch. Using an external strap resistor to deiced the character

of this pin. Table 6.1.3.1 describes the configuration of strap resistor.

Table 6.1.3.1 CEN(#) Strapping

CEN Strap

CEN

Configuration

External Pull-High

External Pull-Down

Remark

High Active System

Low Active System

CEN#

In order to control the Power Switch, the CEN (or CEN#) should be connected to the enable pin

of the Power Switch. The F75204 will assert a signal for 1 sec to cut off the Vbus power, when the

logic input signal level of CB changes from 0 to 1 or 1 to 0. This function is able to emulate the re-

plug of USB device and guarantee that the device has correct contact detection.

The F75204 use CEN(#) pin to reconnect the devices. In other word, when a non-CDP device is

connected to the USB charging port, the F75204 will trigger CEN (CEN#) pulse, and make the device

to reconnect with host in the SDP mode.

CEN: (External Pull-High on CEN(#)_Strap)

If the USB Vbus is controlled by an Active-High power switch, strap the F75204 to CEN

configuration. Then F75204 CEN pin will assert a constant high signal to enable the Vbus Power

Switch. Only when the logic level CB changes, then the CEN pull-down for 1 Sec to temporary shut

down the Vbus.

Dec., 2011

V0.16P

1...5 6 789 10 11...14

中文翻译

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