Datasheet

RAIL 1-RAIL8
TP1-TP8
PSInput/UVFault
JP21-JP28
PSMonitor
JP1-JP8
Ext,ENxandMONx
J4
PSEnablePU/PD
JP9-JP16
I C AddressSelection
JP17-JP20
2
UCD9080
I CCommunication
2
J3
5V AC AdapterIn
J1
5VLabSupplyIn
J5
www.ti.com Hardware Overview
Figure 2. UCD9081EVM Functionality
The UCD9081EVM provides the following functionality:
• Sequencing for the eight onboard power supply rails
• Monitoring for the eight onboard power supply rails
• Power supply enables can be sent off board via a header to sequence external power supplies.
• External power supplies can be monitored by connecting them to an onboard header (jumpers select
onboard or offboard monitoring).
• Sequencing for the general-purpose outputs
• Jumpers for configuring the I
2
C address of the UCD9081 (detected at start-up)
• Standard 100-kHz I
2
C communication via I
2
C connector to USB adapter for connection to a PC
• LEDs for board power and power supply enables for quick visible indication of power supply status
The eight power supplies, provided on the UCD9081EVM, are a combination of low-dropout regulators
(LDO), power converter integrated circuits (IC), and power converter modules, all from Texas Instruments
(TI).
Rails 1-6 have a TI TPS76901 LDO for generating voltages from 1.4 V to 2.4 V. Rail 7 has a TI PTH04070
switching power supply IC for generating a 2.6-V output. Rail 8 has a TI PTH05050 power module used
for generating a 2.8-V output. This set of power supplies are provided for generating different output
voltages on the board for the testing of different sequencing and monitoring conditions.
Users can communicate with the board using the I
2
C protocol through the supplied USB Interface Adapter
and GUI. The GUI helps users to change the sequencer configuration as well as monitor voltage and
device status from a Windows PC.
SLVU249 – September 2008 UCD9081 Power Supply Sequencer and Monitor EVM 3
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