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MAX34446
PMBus Power-Supply Data Logger
ADC INPUT
A
D
E
K
VOUT_OV_FAULT_LIMIT
2% HYSTERESIS
B
F
VOUT_OV_WARN_LIMIT
2% HYSTERESIS
C
G
I
J
H
FAULTn
NOTE 1: POINTS A THROUGH K ARE VOLTAGE SAMPLE POINTS.
NOTE 2: MFR_FAULT_RESPONSE = 82h. THE MAX34446 ONLY RESPONDS TO FAULTS.
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
THE CHANNEL IS ENABLED (POR, ENABLE, OR THROUGH PMBus). FAULTn ASSERTED, NO STATUS BITS SET, NO NV LOG.
NO CHANGE.
FAULTn IS RELEASED. THE MAX34446 IS NOW ALLOWED TO RESPOND TO VOUT_OV_FAULT_LIMIT EXCURSIONS.
FAULTn IS ASSERTED. VOUT_OV_FAULT STATUS IS SET, BUT NOT VOUT_OV_WARN. AN NV LOG IS WRITTEN.
NO CHANGE.
NO CHANGE.
FAULTn IS RELEASED. VOUT_OV_FAULT STATUS CAN BE CLEARED.
THE MAX34446 IS NOW ALLOWED TO RESPOND TO VOUT_OV_WARN_LIMIT EXCURSIONS.
NO CHANGE.
VOUT_OV_WARN STATUS IS SET.
FAULTn IS ASSERTED. VOUT_OV_FAULT STATUS IS SET. AN NV LOG IS WRITTEN.
Figure 2. Fault Response After a Channel is Enabled
System Watchdog Timer
The device uses an internal watchdog timer that is inter-
nally reset every 500 F s. In the event that the device is
locked up and this watchdog reset does not occur after
500ms, the device automatically resets. After the reset
occurs, the device reloads all configuration values that
Maxim Integrated
were stored to flash and begins normal operation. After
the reset, the device also does the following:
1) Sets the NONE OF THE ABOVE bit in STATUS_BYTE.
2) Sets the NONE OF THE ABOVE and MFR bits in
STATUS_WORD.
3) Sets the WATCHDOG bit in STATUS_MFR_SPECIFIC.
17
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