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1.4
Jumpers
1.5
Test Points
2
System Overview
System Overview
The UCD9080 EVM operation can be configured with different jumpers, that include these functions:
•
Monitoring onboard or external power supply voltages
•
Generating enable signals for driving onboard or external power supplies
•
Setting of the I
2
C address for the system
•
Creating undervoltage faults for the onboard power supplies
See
for descriptions and default settings of all jumpers included on the UCD9080EVM.
Table 1. UCD9080 Jumpers
Number
Function
Default Setting
JP1–JP8
Power supply monitoring through onboard power supplies or externally connected.
Pins 1-2 (onboard
Connect to pins 1-2 for monitoring onboard supplies and pins 2-3 for external supplies via
supplies)
connector J4.
JP9–JP16
Power supply enable signal configuration ( pullup or pulldown). Enable pins for each of
Pins 1-2 (pullup to 3.3 V
the channels can be either pulled up to 3.3 V or down to ground to support power
for active-low supply
supplies that have either active-high or active-low enables. Connect to pins 1-2 for pulling
enables).
up to 3.3 V and connect to pins 2-3 for pulling down to ground.
JP17–JP20
I
2
C address detection. Four digital signals on the UCD9080 are sampled at start-up to
Pins 2-3 (pulldown to
determine its I
2
C address. These four jumpers control, if the signals are pulled up to 3.3 V
ground for all zero).
or down to ground. Connect to pins 1-2 for 3.3 V and connect to pins 2-3 for ground.
JP21–JP28
Undervoltage fault. For each rail, you can generate an undervoltage fault by removing this Jumper on pins 1-2 for
jumper. Removal of these jumpers removes input from the power supplies, causing the
no undervoltage fault.
output voltage being monitored by the UCD9080 to fall below the configured undervoltage
threshold. If the UV threshold is zero, no undervoltage occurs.
JP29
Enable8 shared with I
2
C address detection. Remove this jumper when communicating
Jumper on pins 1-2.
with the GUI.
The UCD9080EVM comes with a set of test points that can be used for evaluation. All eight power supply
rails have test points on the right side of the board for monitoring the power supply voltages and the
UCD9080EVM supply voltage (3.3 V).
The system block diagram is shown in
.
Figure 2. System Block Diagram
4
UCD9080 Power Supply Sequencer and Monitor Evaluation Module
SLVU184A – March 2007 – Revised February 2008
