34825 datasheet(15/39 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34825

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

Switch

Array

I2C

Interface

VBUS

Detection

Logic

Output

Internal

Power

Supplies

Logic &

State

Machine

ID ADC

Detection

Figure 12. 34825 Functional Internal Block Diagram

INTERNAL POWER SUPPLIES

This block contains the bias power supplies to the internal

circuits. The inputs to this block include VBUS, VDD and

VDDIO.

LOGIC AND STATE MACHINE

This block includes the state machine for accessory

detection and identification, the register map, and other logic

circuits.

I2C INTERFACE

The I2C interface block has the circuit for the I2C

communication that a master device can use to access the

registers in the 34825. The 34825 is a slave device.

LOGIC OUTPUT

The logic output includes open-drain or push-pull drivers

for the four logic output signals, TEST1, TEST2, INT, and

ISET.

SWITCH ARRAY

The switch array consists of analog switches for UART,

USB, audio signal switching and one high-voltage power

MOSFET for power switching.

VBUS DETECTION

This block detects whether the power supply at VBUS pin

is present or removed.

ID DETECTION

This block contains a circuit to detect whether an ID resistor

is connected to the ID pin or not.

ID ADC

An internal 5-bit ADC measures the resistance at the ID

pin. The result is stored in the ADC Result register and sent

to the Logic and State Machine block to determine what

accessory is attached.

34825 Datasheet(PDF) 15 Page - Freescale Semiconductor, Inc

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