LT3045 datasheet(55/62 Pages) AD

55 / 62 page

Data Sheet

LT3074

analog.com

Rev 0.

55 of 62

MFR_BIAS_UV_WARN_LIMIT

The MFR_BIAS_UV_WARN_LIMIT command sets the value of the bias voltage measured at the BIAS pin, in Volts, which

causes a bias voltage low warning. The bias voltage measured and converted by the ADC (and reported using the

MFR_READ_VBIAS command) is used to compare the actual bias voltage to the limit value. As a result, there can be

up to a 20ms delay from the time the bias voltage hits the limit to the time the fault is reported. Transitionary faults

that last for a time period smaller than the ADC conversion time are filtered out and not reported.

In response to the MFR_BIAS_UV_WARN_LIMIT being exceeded, the device:



Sets the NONE_OF_THE_ABOVE bit in STATUS_BYTE register.



Sets the MFRSPECIFIC bit in the STATUS_WORD register.



Sets the VBIAS_UV_WARNING bit in the STATUS_MFR_SPECIFIC register.



Notifies the host by asserting the ALERT pin.

This command has two data bytes and is formatted in the Linear_5s_11s format.

MFR_IOUT_MIN_WARN_LIMIT

The MFR_IOUT_MIN_WARN_LIMIT command sets the value of the minimum output current, in Amperes, which

causes an output low current warning. This command can be used to detect open connections from the output of

the LT3074 to the load device. The output current measured and converted by the ADC (and reported using the

READ_IOUT command) is used to compare the actual output current to the limit value. As a result, there can be up

to a 14ms delay from the time the output current hits the limit to the time the fault is reported. Transitionary faults

that last for a time period smaller than the ADC conversion time are filtered out and not reported.

In response to the MFR_IOUT_MIN_WARN_LIMIT being exceeded, the device:



Sets the NONE_OF_THE_ABOVE bit in STATUS_BYTE register.



Sets the MFRSPECIFIC bit in the STATUS_WORD register.



Sets the IOUT_MIN_WARNING bit in the STATUS_MFR_SPECIFIC register.



Notifies the host by asserting the ALERT pin.

This command has two data bytes and is formatted in the Linear_5s_11s format.

If the LT3074 is powered on without a preload greater than the default value set by MFR_MIN_IOUT_WARN_LIMIT

MFR_SPECIAL_ID

The MFR_SPECIAL_ID command is used by the LTPowerPlay GUI for device identification. This read-only command

has two data bytes.

MFR_DEFAULT_CONFIG

The MFR_DEFAULT_CONFIG command is used to notify the host if any of the write-able registers of the LT3074 have

been modified. A value of 0x01 indicates that all write-able registers are in their default configuration (as set upon a

power on or a reset event). A value of 0x00 indicates that at least one write-able register has been modified from its

default status. This command can be used to detect a BIAS UVLO event.

This command has one data byte.

LT3045 Datasheet(PDF) 55 Page - Analog Devices

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