LT3074AVPBF datasheet(47/62 Pages) AD

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Data Sheet

LT3074

analog.com

Rev 0.

47 of 62

Table 13. WRITE_PROTECT Command Supported Data Bytes

Reg Byte Description

0x80

Disable all writes except to the WRITE_PROTECT command.

0x40

Disable all writes except to the WRITE_PROTECT, PAGE and OPERATION commands.

0x20

Disable all writes except to the WRITE_PROTECT, PAGE, OPERATION and ON_OFF_CONFIG

commands.

0x00

Enable all writes.

Sending a data byte that is not supported by the WRITE_PROTECT command generates an invalid data fault that is

reported in the STATUS_CML register, and the command is ignored.

This command has one data byte.

CAPABILITY

This command provides a way for the host system to determine some key capabilities of a target device.

The LT3074 supports packet error checking, 400kHz bus speeds, and ALERT pin. This read-only command has one

data byte.

VOUT_MODE

The VOUT_MODE command specifies the formatting for the output voltage. This includes the formatting for reporting

the output voltage measured (as reported by the READ_VOUT register) as well as for setting the warning limits (set

by the VOUT_OV_WARN_LIMIT and VOUT_UV_WARN_LIMIT registers). The data byte always reads 0x13 that implies

a L16 (Linear 16 unsigned) format with an exponent fixed to -13.

This read-only command has one data byte.

VOUT_OV_WARN_LIMIT

The VOUT_OV_WARN_LIMIT command sets the value of the output voltage measured at the SENSE pin, in Volts,

which causes an output voltage high warning. The output voltage measured and converted by the ADC (and reported

using the READ_VOUT command) is used to compare the actual output voltage to the limit value. As a result, there

can be up to a 10ms delay from the time the output 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 VOUT_OV_WARN_LIMIT being exceeded, the device:



Sets the NONE_OF_THE_ABOVE bit in STATUS_BYTE register.



Sets the VOUT bit in the STATUS_WORD register.



Sets the VOUT_OV_WARNING bit in the STATUS_VOUT register.



Notifies the host by asserting the ALERT pin.

This command has two data bytes and is formatted in the Linear_16u format.

VOUT_UV_WARN_LIMIT

The VOUT_UV_WARN_LIMIT command sets the value of the output voltage measured at the SENSE pin, in Volts,

which causes an output voltage low warning. The output voltage measured and converted by the ADC (and reported

using the READ_VOUT command) is used to compare the actual output voltage to the limit value. As a result, there

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