Datasheet

BUF16821EVM-USB Software www.ti.com
Table 4 summarizes the function of the BUF16821EVM-USB test board jumpers. For most applications,
Jumpers 1 through 5 are all set to the default positions.
Table 4. BUF16821EVM-USB Test Board Jumper Functions
Jumper Default Purpose
This jumper selects whether the V
SD
pin on the
BUF16821 is connected to the V
DUT
signal
generated from the USB_DIG_Platform or whether
JMP1 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 V
SD
pin to the V
DUT
control signal.
This jumper selects whether the SDA pin on the
BUF16821 is connected to the I2C_SDA_ISO signal
generated from the USB_DIG_Platform or whether
JMP2 the SDA pin is connected to terminal T4, allowing
for an external source to control the I
2
C data line.
The default INT position connects the SDA pin to
the I2C_SDA_ISO control signal.
This jumper selects whether the SCL pin on the
BUF16821 is connected to the I2C_SCK_ISO signal
generated from the USB_DIG_Platform or whether
JMP3 the SCL pin is connected to terminal T4, allowing
for an external source to control the I
2
C clock line.
The default INT position connects the SCL pin to
the I2C_SCK_ISO control signal.
This jumper selects whether the BKSEL pin on the
BUF16821 is controlled by the manual switch
located on the BUF16821EVM-USB or whether the
JMP4 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.
This jumper selects the I
2
C A0 address. Two
JMP5 separate I
2
C addresses can be selected depending
upon whether JMP1 is set to high or low.
Table 5 summarizes the function of the USB_DIG_Platform jumpers. For most applications, the default
jumper position should be used. A separate document (SBOU058) gives details regarding the operation
and design of the USB_DIG_Platform.
Table 5. USB_DIG_Platform Jumper Functions
Jumper Default Purpose
This jumper selects external power or bus power.
External power is applied on J5 or T3 (9V dc). Bus
JUMP1 EXT
power is 5V from the USB bus. External power is
typically used because the USB Bus power is noisy.
JUMP2 EXT Same as JUMP1.
This jumper determines where the TUSB3210 will
load the USB_DIG_Platform firmware upon
JUMP3 EE ON
power-up or reset. The EE Off position is used for
development for development or firmware update.
This jumper sets the address for the USB board.
JUMP4, JUMP5 L, L The only reason to change from the default setting
is if multiple boards are being used.
This jumper selects the voltage of the device under
test supply (V
DUT
= 5V or 3V). This jumper is
JUMP9 5V
typically the only jumper that is changed for most
applications.
JUMP10 WP ON This write protects the firmware EEPROM.
JUMP11 WP ON This write protects the calibration EEPROM.
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BUF16821EVM-USB Evaluation Board and Software Tutorial SBOU106– May 2011
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