LT3074AVPBF datasheet(54/62 Pages) AD

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Data Sheet

LT3074

analog.com

Rev 0.

54 of 62

MFR_MARGIN

The MFR_MARGIN command is used to calculate the output voltage high and low margin values, as a percentage of

the nominal output voltage. The margin value calculated using this command is applied at the output of the LT3074

based on the status of the OPERATION command.

Table 23. MFR_MARGIN Bit Field Descriptions

Bit

Access Mode

Description

7:4

Read/Write

4-bit code used to calculate the high side margin percentage. See Table 24 for the

margin percentage corresponding to each code.

3:0

Read/Write

4-bit code used to calculate the low side margin percentage. See Table 24 for the

margin percentage corresponding to each code.

Table 24. MFR_MARGIN Code to Margining Percentage Mapping

4-Bit Code

Margin Percentage

4’b0000

4’b0001

4’b0010

4’b0011

4’b0100

4’b0101

4’b0110

4’b0111

4’b1000

This command has one data byte.

MFR_READ_VBIAS

The MFR_READ_VBIAS command returns the measured BIAS pin voltage, in Volts. This read-only command has two

data bytes formatted in the Linear_5s_11s format.

MFR_BIAS_OV_WARN_LIMIT

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

which causes a bias voltage high 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_OV_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_OV_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.

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