Datasheet

MAX34446
PMBus Power-Supply Data Logger
23Maxim Integrated
OT_WARN_LIMIT (51h)
The OT_WARN_LIMIT command sets the temperature, in degrees Celsius, of the selected temperature sensor at which
an overtemperature warning is detected. The monitored temperature must drop by at least 4NC below the limit before
the warning is allowed to clear. This warning is masked until the temperature is below this limit for the first time. The 2
data bytes are in DIRECT format. In response to the OT_WARN_LIMIT being exceeded, the device does the following:
1) Sets the TEMPERATURE bit in STATUS_BYTE.
2) Sets the TEMPERATURE and MFR bits in STATUS_WORD.
3) Sets the OT_WARN bit in STATUS_MFR_SPECIFIC register.
4) Responds as specified in the MFR_FAULT_RESPONSE.
POWER_GOOD_ON (5Eh)
The POWER_GOOD_ON command sets the value of the monitored voltage that causes the PG[3:0] outputs to assert.
The monitored voltage must be above the associated POWER_GOOD_ON threshold before the associated PGn output
is asserted and the POWER_GOOD# bit in the associated STATUS_MFR_SPECIFIC is cleared (Figure 3). The assertion
of the PGn outputs can be delayed with the MFR_PG_DELAY command. All individual voltage channels must exceed
POWER_GOOD_ON before the POWER_GOOD# bit in the STATUS_WORD is cleared. The POWER_GOOD_ON level
is normally set higher than the POWER_GOOD_OFF level. The 2 data bytes are in DIRECT format. This command is
ignored if the channel is disabled or configured to monitor current.
POWER_GOOD_OFF (5Fh)
The POWER_GOOD_OFF command sets the value of the monitored voltage that causes the PG[3:0] outputs to deassert
after it has been asserted. A monitored voltage that falls below the associated POWER_GOOD_OFF threshold causes
the associated PGn output to be deasserted and the POWER_GOOD# bit in STATUS_WORD and the POWER_GOOD#
bit in the associated STATUS_MFR_SPECIFIC is set (Figure 3). The POWER_GOOD_OFF level is normally set lower
than the POWER_GOOD_ON level. The 2 data bytes are in DIRECT format. This command is ignored if the channel is
disabled or configured to monitor current.
USER NOTE: The PGn outputs are forced high impedance if the channel is disabled or if the channel is config-
ured to measure current.
Figure 3. Power Good, SYNC Output, and Status Bit Timing
SYNC OUTPUT
MFR_SYNC_CONFIG = 1428h
MFR_PG_DELAY
POWER_GOOD_ON
POWER_GOOD_OFF
100kHz 200kHz 100kHz
ADC INPUT
PGn OUTPUT
POWER_GOOD# BIT IN
STATUS_MFR_SPECIFIC