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Software Configuration

2.3 Pin Assignment Settings

Figure 3. Pin Assignments For Supplies, Enables, and Monitoring

Different configurations are possible with the TSW2200, notably changing the enable settings so the EVM

powers up with all supplies off or all supplies on. Configuration of active-low or active-high enable settings

for each supply as well as the pin assignments for monitoring and enabling are shown in the pin

assignment screen, Figure 3.

Pin assignments are made for the rail name using the pin monitors, as seen in the Voltage column in

Figure 3 . These are preset and must not be changed as this is a permanent pin configuration in the

hardware. Because the negative regulator's output is –5 V, the monitor pins of the UCD90120A cannot

support a voltage outside the range of 0 V to 2.5 V. In order to eliminate an extra inverter for purposes of

converting the –5 V to the required monitor voltage range, no monitoring is provided for the –5V supply.

The enables are also preset in the hardware and must not be changed from the settings shown in

Figure 3. All supplies have an enable pin connected and used so that all the supplies can be sequenced.

The last customizable pin assignment configuration is under the Configure link highlighted in Figure 3.

When selecting Configure, the screen shown in Figure 4 appears and allows options for an active-low or

active-high enable polarity as well as two types of output mode configurations. The output mode

configuration is always actively driven.

SLWU081A–May 2012–Revised December 2012 TSW2200EVM: Multi-Output Power Supply Evaluation Module

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