LTC3613 datasheet(39/44 Pages) AD

39 / 44 page

LTC7131-1

Rev. 0

For more information www.analog.com

All of the following telemetry registers are initialized to

0x8000 when cycling power, cycling RUN_MSTR pin

or sending a MFR_RESET command. The register will

remain at this value until its first conversion is complete—

typically within 50ms of the initialization event.

READ_VIN

The READ_VIN command returns the measured input

voltage, in volts, at the VIN pin.

This read-only command has two data bytes and is for-

matted as a 16-bit 2’s complement value scaled 4mV/bit.

READ_VOUT

The READ_VOUT command returns the measured output

voltage,involtsasspecifiedbytheVOUT_MODE command.

The output voltage is sensed at the VSENSE+ and

VSENSE– pins.

This read-only command has two data bytes and is for-

matted as a 16-bit 2’s complement value scaled 0.5mV/bit.

READ_IIN

The READ_IIN command returns the input current in

Amperes. The input current is derived from READ_IOUT

current and the measured duty cycle with an offset term

added to account for quiescent current and driver current.

For accurate values at light load currents the part must be

in continuous conduction mode.

This register is reset to 0x8000 is standby mode when

the drivers are off.

This read-only command has two data bytes and is for-

matted as a 16-bit 2’s complement value scaled 10mA/bit.

PMBus COMMAND DETAILS

Table 11. Status Word Bit Descriptions and Conditions

BIT

DESCRIPTION

CONDITION

SET ALERT?

CLEARABLE BY

WRITING ‘1’ TO BIT?

0 (LSB)

None of the Above

If b[15] set due to VOUT undervoltage

Yes

Communication Failure

(See Note 1)

Yes

Temperature Fault

Temp > 150°C

Yes

VIN Undervoltage Fault

Not Implemented

Output Overcurrent Fault

Not Implemented

Output Overvoltage Fault

VOUT > PGOOD High Threshold

Yes

OFF

No Power to the Output (Note 2)

Busy

Not Implemented

Unknown

Not Implemented

Other

Not Implemented

Fans

Not Implemented

PGOOD

Inverted state of PGOOD pin

Manufacturer Specific

Not Implemented

Input Voltage/ Current/Power Fault

Not Implemented

Yes

Output Current/Power Fault

Not Implemented

15 (MSB)

Output Voltage Fault

VOUT outside PGOOD window

(Note 3)

Yes

Note 1: Communication failure is one of following faults: host sends too

few bits, host reads too few bits, host writes too few bytes, host reads too

many bytes, improper R/W bit set, unsupported command code, attempt

to write to a read-only command. See PMBus Specification v1.2, Part II,

Sections 10.8 and 10.9 for more information.

Note 2: Power may be off due to any one of the following conditions:

RUN_STBY low, OPERATION ON cleared, VIN undervoltage or

overtemperature warning. When the power is off due to RUN_MSTR

low or due to a more serious fault conditions such as VIN low or

overtemperature fault, the PMBus interface is turned off instead of

asserting the OFF bit.

Note 3: This bit is disabled when drivers are off for any reason, soft-start

not complete, or the VOUT has not reached the PGOOD window for the

first time.

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