Rainbow Electronics MAX16068 - Manual (Page 15)

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MAX16068
6-Channel, Flash-Configurable System Manager
with Nonvolatile Fault Registers
Faults
The MAX16068 monitors the input (MON_) channels and
compares the results with an overvoltage threshold and
an undervoltage threshold. Based on these conditions,
the MAX16068 asserts various fault outputs and save
specific information about the channel conditions and
voltages into the nonvolatile flash. Once a critical fault
event occurs, the failing channel condition, ADC conver-
sions at the time of the fault, or both can be saved by
configuring the event logger. The event logger records a
single failure in the internal flash and sets a lock bit that
protects the stored fault data from accidental erasure on
a subsequent power-up.
The MAX16068 is capable of measuring overvoltage
and undervoltage fault events. Fault conditions are
detected at the end of each ADC conversion. An over-
voltage event occurs when the voltage at a monitored
input exceeds the overvoltage threshold for that input.
An undervoltage event occurs when the voltage at a
monitored input falls below the undervoltage threshold.
Fault thresholds are set in registers r49h–r59h as shown
in Table 9. Disabled inputs are not monitored for fault
conditions and are skipped over by the input multiplexer.
Only the upper 8 bits of a conversion result are com-
pared with the programmed fault thresholds.
Table 9. Fault Threshold Registers
REGISTER
ADDRESS
FLASH
ADDRESS
BIT RANGE DESCRIPTION
48h 248h [7:0] Not used
49h 249h [7:0] MON1 overvoltage threshold
4Ah 24Ah [7:0] MON1 undervoltage threshold
4Bh 24Bh [7:0] Not used
4Ch 24Ch [7:0] MON2 overvoltage threshold
4Dh 24Dh [7:0] MON2 undervoltage threshold
4Eh 24Eh [7:0] Not used
4Fh 24Fh [7:0] MON3 overvoltage threshold
50h 250h [7:0] MON3 undervoltage threshold
51h 251h [7:0] Not used
52h 252h [7:0] MON4 overvoltage threshold
53h 253h [7:0] MON4 undervoltage threshold
54h 254h [7:0] Not used
55h 255h [7:0] MON5 overvoltage threshold
56h 256h [7:0] MON5 undervoltage threshold
57h 257h [7:0] Not used
58h 258h [7:0] MON6 overvoltage threshold
59h 259h [7:0] MON6 undervoltage threshold