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Customizing the Design

Figure 8. Device Configuration Panel

The Warning and Fault Threshold tab allows configuration of the input under-voltage, input over-voltage,

output under-voltage, input over-current, input power, and over temperature warnings. This tab also allows

adjustment of the over-temperature fault threshold. Fault threshold for the input over- and under-voltage,

current limit, power limit, and power good are set by the hardware design. Decimal values for the

thresholds are shown in the text box located to the right of the slider bar. Above the decimal values setting

is the value of the setting in hexadecimal, which can be useful when developing software for this device.

The fault behavior tab allows the user to set the device fault configuration and fault masking. The fault

configuration section allows the user to set the number of retries, as well as the circuit breaker and current

limit thresholds. The number of retries can be set by the RETRY pin to be infinite or latched off. Through

software, the number of retries can be set to 0 (latch-off), 1, 2, 4, 8, 16 or infinite. The software settings

are independent of the hardware settings; however, if the power is cycled the device will default to values

dictated by the hardware. Current limit power-up values are also set by the hardware. The values for

current limit can be set to either 26 mV (CL = VDD) or 50 mV (CL = GND). The circuit breaker threshold

can also be set in software to either 1.9 times or 3.9 times the current limit value through the software.

Fault masking is possible for many of the device fault conditions. Fault conditions allow masking of both

the MOSFET response and the SMBus alert signal. Note that if a fault occurs repeatedly while the

MOSFET is masked, damage to the MOSFET may result. This feature is allowed primarily for debug

purposes. Faults that do not shut off the MOSFET, and only issue a SMBus alert, will also allow masking

of the alert. Note the power-up default setting for the Power Good signal is to mask the SMBus alert, in

order to ensure that SMBus alert is not asserted immediately after power-up.

For convenience, the Device Configuration Panel can be undocked by holding down the left mouse button

while the cursor is at the top of the panel and dragging it to where you would like it to be placed.

10 Customizing the Design

The GUI assumes the hardware configuration is set to default LM5066 evaluation board configuration. If

any of the components are changed, the device hardware configuration needs to be updated in the Design

Tool section. To open the design tool, click the Wrench button located on the LM5066 block

representation which will open the window displayed in Figure 9.

SNVA487A–August 2011–Revised April 2013 AN-2160 LM5066 Evaluation Board

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