Datasheet

BUF18830EVM Hardware Overview www.ti.com
Table 3 summarizes the function of the BUF18830EVM board jumpers. For most applications, Jumpers 1
through 5 are all set to the default positions.
Table 3. BUF18830EVM Test Board Jumper Functions
Jumper Default Purpose
This jumper shorts V
COM
and AV
DD
to each other. In
JMP1 Short the Open position, terminal T6 can be used to set
the V
COM
using an external power source.
This jumper selects the I
2
C A0 address selection.
JMP2 L Two separate I
2
C addresses can be selected,
depending upon whether JMP1 is set to high or low.
This jumper selects whether the DV
DD
pin on the
BUF18830 is connected to the V
DUT
signal
generated from the USB_DIG_Platform or whether
JMP3 INT the digital supply pin is connected to terminal T1,
allowing for an external supply to power the digital
circuitry. The default INT position connects the
DV
DD
pin to the V
DUT
control signal.
Table 4 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 4. 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.
Uses the regulator output to generate the V
DUT
JUMP13 REG supply. The USB bus can be used as the V
DUT
supply.
Uses the external power (9V as opposed to the
JUMP14 9V
bus).
While in the BUS position V
DUT
operation is normal.
While in the V
RAW
position the V
DUT
supply is
JUMP17 BUS
connected to an external source. This configuration
allows for any value of V
DUT
between 3V and 5V.
(1)
Connects the pull-up on GPIO to the V
DUT
supply or
JUMP18 V
DUT
the V
CC
supply.
(1)
CAUTION: Adjusting outside of this range will damage the EVM.
12
BUF18830EVM User Guide and Software Tutorial SBOU103–April 2011
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