TUSB3200A datasheet(21/102 Pages) TI1

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TUSB3200A

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SLES018B – OCTOBER 2001 – REVISED FEBRUARY 2011

2.1.13 Codec Port Interface

The TUSB3200A provides a configurable full-duplex bidirectional serial interface that can connect to a

codec or another device for streaming USB Isochronous data. The interface can be configured to support

several different industry standard protocols, including AC '97 1.X, AC '97 2.X, and I2S.

2.1.14 I

2C Interface

The I2C interface logic provides a two-wire serial interface that can be used by the 8052 MCU to access

other ICs. The TUSB3200A is an I2C master device only and supports single byte or multiple byte read

and write operations. The interface can be programmed to operate at either 100 kbps or 400 kbps. The

protocol supports 8-bit or 16-bit addressing for accessing the I2C slave device memory locations.

2.1.15 Pulse Width Modulation (PWM) Output

The TUSB3200A provides a pulse width modulation output with programmable frequency and pulse width.

The frequency can be programmed from 732 Hz to 93.7 kHz with an 8-bit register. The pulse width of the

output signal is set with a 16-bit register.

2.1.16 General-Purpose IO Ports (GPIO)

The TUSB3200A provides two general-purpose IO ports that are controlled by the internal 8052 MCU. The

two ports, port 1 and port 3, are 8-bits and 5-bits, respectively. Note that port 3 bit locations 2, 6, and 7

have been used in the TUSB3200A for other functionality. Therefore these three bit locations are not

available for GPIO use. Port 3 bit location 2 has been used as the external interrupt (XINT) input to the

TUSB3200A. Port 3 bit locations 6 and 7 have been used as the external MCU write strobe and read

strobe inputs for the external MCU mode of operation.

Each bit of both ports can be independently used as either an input or output. Hence each port bit consists

of an output buffer, an input buffer, and a pullup resistor (the pullups are not, strictly speaking, resistors;

they are 100-µA pullup active terminators). The pullup resistors on the GPIO pins can be disabled using

the PUDIS bit in the global control register.

2.1.16.1 External Pullup Macro

This is the equivalent circuit of the pullup "resistor", from the silicon library used to implement the

TUSB3200A.

Logic Symbol (Positive Logic)

Table 2-1. Electrical Characteristics of Pullup Resistors(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Output current

VO = 0 V

–35.98

–90.67

–197.38

µA

Input loading factor TAP

1.65

Input loading factor PWRDN

2.50

Cpd

Equivalent power dissipation capacitance

0.04

(1)

When PWRDN = H, the current source is turned off.

NOTE: For use with 3-V I/Os only.

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