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BUF08821EVM-USB Hardware Overview

Table 3 summarizes the function of the BUF08821EVM-USB board jumpers. For most application,

Jumpers 1 through 5 are all set to the default positions.

Table 3. BUF08821EVM-USB Test Board Jumper Functions

Jumper Default Purpose

JMP1 This jumper selects whether the SCL pin on the BUF08821 is

connected to the I2C_SCK_ISO signal generated from the

USB_DIG_Platform or whether the SCL pin is connected to

terminal T4, allowing for an external source to control the I

clock line. The default INT position connects the SCL pin to the

I2C_SCK_ISO control signal.

JMP2 This jumper selects whether the VSD pin on the BUF08821 is

connected to the V

DUT

signal generated from the

USB_DIG_Platform or whether the digital supply pin is

connected to terminal T2, allowing for an external supply to

power the digital circuitry. The default INT position connects the

VSD pin to the V

DUT

control signal.

JMP3 This jumper selects whether the BKSEL pin on the BUF08821 is

controlled by the manual switch located on the

BUF08821EVM-USB or whether the BKSEL can be controlled

by an external source connected to terminal T3. The default INT

position allows the BKSEL pin to be controlled by the manual

switch.

JMP4 This jumper selects whether the SDA pin on the BUF08821 is

connected to the I2C_SDA_ISO signal generated from the

USB_DIG_Platform or whether the SDA pin is connected to

terminal T4, allowing for an external source to control the I

data line. The default INT position connects the SDA pin to the

I2C_SDA_ISO control signal.

JMP5 This jumper sets the I

C A0 address selection. Two separate I

addresses can be selected, depending upon whether JMP1 is

set to high or low.

SBOU095–March 2011 BUF08821EVM-USB User Guide and Software Tutorial

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