MAX16047_09 Datasheet, PDF (34/61 Pages) Maxim Integrated Products – 12-Channel/8-Channel EEPROM-Programmable System Managers with Nonvolatile Fault Registers

12-Channel/8-Channel EEPROM-Programmable
System Managers with Nonvolatile Fault Registers
Faults
The MAX16047/MAX16049 monitor the input (MON_)
channels and compare the results with an overvoltage
threshold, an undervoltage threshold, and a selectable
overvoltage or undervoltage early warning threshold.
Based on these conditions, the MAX16047/MAX16049
can assert various fault outputs and save specific infor-
mation about the channel conditions and voltages into
the nonvolatile EEPROM. Once a critical fault event
occurs, the failing channel condition, ADC conversions
at the time of the fault, or both may be saved by config-
uring the event logger. The event logger records a sin-
gle failure in the internal EEPROM and sets a lock bit
which protects the stored fault data from accidental
erasure on a subsequent power-up.
The MAX16047/MAX16049 are capable of measuring
overvoltage and undervoltage fault events. Fault condi-
tions are detected at the end of each ADC conversion.
An overvoltage event occurs when the voltage at a
monitored input exceeds the overvoltage threshold for
that input. An undervoltage fault occurs when the volt-
age at a monitored input falls below the undervoltage
threshold. Fault thresholds are set in registers r23h to
r46h as shown in Table 15. Disabled inputs are not
monitored for fault conditions and are skipped over by
the input multiplexer. Only the upper 8 bits of a conver-
sion result are compared with the programmed fault
thresholds. Inputs not assigned to a sequencing slot
are not monitored for fault conditions but are still
recorded in the ADC results registers.
The general-purpose inputs/outputs (GPIO1–GPIO6)
can be configured as Any_Fault outputs or dedicated
FAULT1 and FAULT2 outputs to indicate fault condi-
tions. These fault outputs are not masked by the critical
fault enable bits shown in Table 17. See the General-
Purpose Inputs/Outputs section for more information on
configuring GPIOs as fault outputs.
Table 15. Fault Thresholds
REGISTER/
EEPROM ADDRESS
DESCRIPTION
23h
MON1 Early Warning Threshold
24h
MON1 Overvoltage Threshold
25h
MON1 Undervoltage Threshold
26h
MON2 Early Warning Threshold
27h
MON2 Overvoltage Threshold
28h
MON2 Undervoltage Threshold
29h
MON3 Early Warning Threshold
2Ah
MON3 Overvoltage Threshold
2Bh
MON3 Undervoltage Threshold
2Ch
MON4 Early Warning Threshold
2Dh
MON4 Overvoltage Threshold
2Eh
MON4 Undervoltage Threshold
2Fh
MON5 Early Warning Threshold
30h
MON5 Overvoltage Threshold
31h
MON5 Undervoltage Threshold
32h
MON6 Early Warning Threshold
33h
MON6 Overvoltage Threshold
34h
MON6 Undervoltage Threshold
*MAX16047 only
REGISTER/
EEPROM ADDRESS
DESCRIPTION
35h
MON7 Early Warning Threshold
36h
MON7 Overvoltage Threshold
37h
MON7 Undervoltage Threshold
38h
MON8 Early Warning Threshold
39h
MON8 Overvoltage Threshold
3Ah
MON8 Undervoltage Threshold
3Bh
MON9 Early Warning Threshold*
3Ch
MON9 Overvoltage Threshold*
3Dh
MON9 Undervoltage Threshold*
3Eh
MON10 Early Warning Threshold*
3Fh
MON10 Overvoltage Threshold*
40h
MON10 Undervoltage Threshold*
41h
MON11 Early Warning Threshold*
42h
MON11 Overvoltage Threshold*
43h
MON11 Undervoltage Threshold*
44h
MON12 Early Warning Threshold*
45h
MON12 Overvoltage Threshold*
46h
MON12 Undervoltage Threshold*
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