34825 datasheet(34/39 Pages) FREESCALE

Part #	34825

Description	Micro-USB Interface IC Supporting Universal Charging Solution and Wired Accessories

PDF	39 Pages

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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34 / 39 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

34825

TYPICAL APPLICATIONS

be less than 22 nF. A 4.7 nF X5R capacitor is recommended

for the typical application. The OUT pin requires a 1.0 μF

decoupling capacitor; a 0.01 μF capacitance is enough for

the VDDIO pin.

TYPICAL APPLICATIONS

INTERFACE CIRCUIT IN A CELL PHONE

When the 34825 is used in a cell phone. The typical circuit

is shown in the Figure 27. The I2C bus need two pull-up

resistors. Typically they are 4.7 k

Ω. When the audio outputs

of the cell phone baseband or application processor are

direct drive signals, the audio signals can be connected to the

corresponding pins of 34825 directly. Otherwise these

signals need DC-blocking capacitors to remove the DC level.

VDDIO

I2C_SDA

I2C_SCL

INT

VDDIO

RxD

TxD

D+

D-

TEST1

TEST2

VDD

GND

VBUS

D+

D-

GND

I2C

UART

USB Xcvr

GPIO

Baseband

SHLD

Test

Interface

OUT

VBUS

MC34673

ISET

Audio

4.7 nF

1.0 µF

Li+

1.0 µF

9.1 k

12 k

2x4.7 k

MIC

SPK_L

SPK_R

2 k

VAIO

For direct-drive audio output, these DC

blocking capacitors are not needed

* :

0.1 µF

Figure 27. Interface Circuit in a Cell Phone System

34825 Datasheet(PDF) 34 Page - Freescale Semiconductor, Inc

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