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MAX34446
PMBus Power-Supply Data Logger
MFR_FAULT_RESPONSE (D9h)
The MFR_FAULT_RESPONSE command specifies the response to each fault condition supported by the device. In
response to a fault, the device always reports the fault in the appropriate status register. A CML fault cannot cause
any device action other than setting the status bit. Table 17 describes the MFR_FAULT_RESPONSE command.
Table 17. MFR_FAULT_RESPONSE
BIT
7:6
5
4
3
2
1:0
BIT NAME
NV_LOG_EN[1:0]
NV_LOG_OV
UV_OV_OC_FILTER
0
LATCHOFF
FAULT_EN[1:0]
MEANING
0x = Never log MFR_NV_FAULT_LOG
10 = Log MFR_NV_FAULT_LOG on faults only.
11 = Log MFR_NV_FAULT_LOG on faults or warnings.
This bit is only valid for pages 0 to 3. Other pages always return a 0. These
bits are used only if the channel is configured to monitor voltage.
0 = Bits 7:6 are ignored for overvoltage faults or warnings.
1 = Bits 7:6 also applies to overvoltage faults or warnings.
This bit is only valid for pages 0 to 3. Other pages always return a 0.
0 = Fault/warn on first sample excursion occurrence.
1 = Requires two consecutive sample excursions before a fault/warning is
declared and action is taken.
One passing sample is needed to clear a fault/warning.
This bit always returns a 0.
Normally after a fault, the device continues monitoring the afflicted param-
eter for the fault to clear and releases the FAULTn pin from being asserted
low and logs future faults (if so enabled) once the currently accused fault
clears. If this bit is set, the associated FAULTn output is latched in the
asserted state (low) and no future fault logs are created until a V DD power
cycle or hardware or software reset occurs. Warnings do not latch a chan-
nel off.
0 = Latchoff disabled.
1 = Latchoff enabled.
0x = Never assert the FAULTn pin.
10 = Assert the FAULTn pin on faults only.
11 = Assert the FAULTn pin on faults or warnings.
Note: For fault responses, a fault is defined as either an undervoltage fault, overcurrent fault, or an overtemperature fault. Bit 6
allows the addition of an overvoltage fault to the fault condition.
MFR_FAULT_RETRY (DAh)
The MFR_FAULT_RETRY command sets the time the FAULTn output should remain active after the fault has been
cleared. This command sets the time delay in multiples of 1ms. The 2 data bytes are in DIRECT format. When
MFR_FAULT_RETRY = 0000h, the delay is disabled and the FAULTn output deasserts immediately after the fault condi-
tion is removed.
MFR_PG_DELAY (DBh)
The MFR_PG_DELAY command sets the delay time between when power good is determined and the associated
PGn pin is asserted. This command sets the time delay in multiples of 1ms. The 2 data bytes are in DIRECT format.
When MFR_PG_DELAY = 0000h, the delay is disabled and the PGn output is asserted immediately after power good
is declared.
Maxim Integrated
29
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