adm1075-2aruz-rl7 Analog Devices, Inc., adm1075-2aruz-rl7 Datasheet - Page 32

• Manufacturer Part Number: adm1075-2aruz-rl7
• Description: −48 V Hot Swap Controller And Digital Power Monitor With Pmbus Interface
• Manufacturer: Analog Devices, Inc.

ADM1075
All warnings in the
monitor sampling voltage and current and then comparing
these measurements to the threshold values set by the various
limit commands. A warning has no effect on the hot swap
controller, but it may generate an SMBAlert on one or both of
the GPOx/ ALERTx output pins.
When a fault or warning status bit is set, it always means that the
status condition—fault or warning—is active or was active at
some point in the past. When a fault or warning bit is set, it is
latched until it is explicitly cleared using either the OPERATION
or the CLEAR_FAULTS command. Some other status bits are
live, that is, they always reflect a status condition and are never
latched.
STATUS_BYTE and STATUS_WORD Commands
The STATUS_BYTE and STATUS_WORD commands can
be used to obtain a snapshot of the overall part status. These
commands indicate whether it is necessary to read more
detailed information using the other status commands.
The low byte of the word returned by the STATUS_WORD
command is the same byte returned by the STATUS_BYTE
command. The high byte of the word returned by the STATUS_
WORD command provides a number of bits that can be used to
determine which of the other status commands must be issued
to obtain all active status bits.
STATUS_INPUT Command
The STATUS_INPUT command returns a number of bits
relating to voltage faults and warnings and power warnings on
the input supply.
STATUS_IOUT Command
The STATUS_IOUT command returns a number of bits
relating to current faults and warnings on the output supply.
STATUS_VAUX Command
The STATUS_VAUX command returns a number of bits
relating to current faults and warnings on the output supply.
STATUS_MFR_SPECIFIC Command
The STATUS_MFR_SPECIFIC command is a standard PMBus
command, but the contents of the byte returned is specific to
the ADM1075.
CLEAR_FAULTS Command
The CLEAR_FAULTS command is used to clear fault and
warnings bits when they are set. Fault and warnings bits are
latched when they are set. In this way, a host can read the bits
any time after the fault or warning condition occurs and
determine which problem actually occurred.
If the CLEAR_FAULTS command is issued and the fault or warn-
ing condition is no longer active, the status bit is cleared. If the
condition is still active—for example, if an input voltage is below
the undervoltage threshold of the UV pin—the CLEAR_FAULTS
command attempts to clear the status bit, but that status bit is
immediately set again.
ADM1075
are generated by the power
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GPO AND ALERT PIN SETUP COMMANDS
Two multipurpose pins are provided on the ADM1075:
GPO1/ ALERT1 /CONV and GPO2/ ALERT2 .
The GPO1/ ALERT1 /CONV and GPO2/ ALERT2 pins have
two output modes of operation. These pins can be configured
independently over the PMBus as general-purpose digital
outputs. They can both be configured to generate an SMBAlert
when one or more fault/warning status bits become active in the
PMBus status registers. For an example of how to configure these
pins to generate an SMBAlert and how to respond and clear the
condition, see the
Address
The GPO1/ ALERT1 /CONV pin can also be configured as an
input (CONV) to drive the power monitor in single-shot run
mode and to control when a power monitor ADC sampling
cycle begins. This function can be used to synchronize sampling
across multiple
ALERT1_CONFIG and ALERT2_CONFIG Commands
Using combinations of bit masks, the ALERT1_CONFIG and
ALERT2_CONFIG commands can be used to select the status
bits that, when set, generate an SMBAlert signal to a processor.
They can also be used to set a GPO mode on the pin, so that it
is under software control. If this mode is set, the SMBAlert
masking bits are ignored.
On the ADM1075, one of the inputs can also be configured
as a hardware-based convert control signal. If this mode is set,
the GPO and SMBAlert masking bits are ignored.
POWER MONITOR COMMANDS
The
voltage power monitor. The power monitor can be configured
in a number of different modes of operation and can run in
either continuous mode or single-shot mode with a number
of different sample averaging options.
The power monitor can measure the following:
•
•
•
The following quantities are then calculated:
•
•
PMON_CONFIG Command
The power monitor can run in a number of different modes with
different input voltage range settings. The PMON_CONFIG
command is used to set up the power monitor.
ADM1075
Input voltage (VIN)
Output current (IOUT)
Auxiliary voltage (VAUX)
Input power (PIN)
Input energy (EIN)
section.
ADM1075
provides a high accuracy, 12-bit current and
Example Use of SMBus Alert Response
devices, if required.
Data Sheet