LTM4686BEVPBF datasheet(96/130 Pages) AD

96 / 130 page

LTM4686B

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

OT_FAULT_LIMIT

The OT_FAULT_LIMIT command sets the value of the power stage temperature, in degrees Celsius, which causes an

overtemperature fault. The READ_TEMPERATURE_1 value will be used to determine if this limit has been exceeded.

This condition is detected by the ADC so the response time may be up to 90ms, typical.

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

OT_WARN_LIMIT

The OT_WARN_LIMIT command sets the value of the power stage temperature, in degrees Celsius, which causes an

overtemperature warning. The READ_TEMPERATURE_1 value will be used to determine if this limit has been exceeded.

In response to the OT_WARN_LIMIT being exceeded, the device:

• Sets the TEMPERATURE bit in the STATUS_BYTE

• Sets the Overtemperature Warning bit in the STATUS_TEMPERATURE command, and

• Notifies the host by asserting ALERT pin, unless masked.

This condition is detected by the ADC so the response time may be up to 90ms, typical.

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

UT_FAULT_LIMIT

The UT_FAULT_LIMIT command sets the value of the power stage temperature, in degrees Celsius, which causes

an undertemperature fault. The READ_TEMPERATURE_1 value will be used to determine if this limit has been

exceeded.

This condition is detected by the ADC so the response time may be up to 90ms, typical.

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

TIMING

Timing: On Sequence/Ramp

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

TON_DELAY

0x60

Time from RUN and/or Operation on to output

rail turn-on.

R/W Word

L11

0.0

0x0000

TON_RISE

0x61

Time from when the output starts to rise

until the output voltage reaches the VOUT

commanded value.

R/W Word

L11

2.0

0xC200

TON_MAX_FAULT_LIMIT

0x62

Maximum time from the start of TON_RISE for

VOUT to cross the VOUT_UV_FAULT_LIMIT.

R/W Word

L11

0xD280

VOUT_TRANSITION_RATE

0x27

Rate the output changes when VOUT

commanded to a new value.

R/W Word

L11

V/ms

0.025

0x8B33

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