Getting Started
The Warning and Fault Threshold tab allows configuration of the input undervoltage, input overvoltage,
output undervoltage, input overcurrent, input power, and overtemperature warnings. This tab also allows
adjustment of the overtemperature fault threshold. The hardware design sets the fault threshold for the
input over-voltage and under-voltage, current limit, power limit, and power good. Decimal values for the
thresholds are shown in the text box located to the right of the slider bar. The hexadecimal value of the
setting is located above the decimal values setting, 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 defaults 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× or 3.9× 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, 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 the desired location.
6.6
Customizing the Design
The GUI assumes the hardware configuration is set to default LM5066I 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 LM5066I block
representation, which will open the window displayed in
Figure 15. LM5066I Design Tool
16
LM5066IEVM-626 Evaluation Module (EVM)
SNVU444 – May 2014
Copyright © 2014, Texas Instruments Incorporated
