MAX16067 Datasheet, PDF (21/47 Pages) Maxim Integrated Products – 6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers

6-Channel, Flash-Configurable System Manager
with Nonvolatile Fault Registers
Critical Faults
During normal operation, a fault condition can be con-
figured to shut down all the EN_OUT_s and store fault
information in the flash memory by setting the appro-
priate critical fault enable bits. During power-up and
power-down, all sequenced MON inputs are considered
critical. Faults during power-up and power-down always
cause the EN_OUT_s to turn off and can store fault infor-
mation in the flash memory, depending on the contents
of r6Dh[1:0]. Set the appropriate critical fault enable bits
in registers r6Eh–r72h (see Table 17) for a fault condition
to trigger a critical fault.
Logged fault information is stored in flash registers
r200h–r208h (see Table 18). After fault information is
logged, the flash is locked and must be unlocked to
enable a new fault log to be stored. Write a ‘0’ to r8Ch[1]
to unlock the configuration flash. Fault information can
be configured to store ADC conversion results and/or
fault flags in registers. Select the critical fault configura-
tion in r6Dh[1:0]. Set r6Dh[1:0] to ‘11’ to turn off the fault
logger. All stored ADC results are 8 bits wide (MSBs of
the conversion).
Power-Up/Power-Down Faults
All EN_OUT_s deassert when an overvoltage or under-
voltage fault is detected during power-up/power-down
and the MAX16067 enters to the fault state. Fault infor-
mation can be stored to flash depending on r6D[1:0]
(see Table 17).
Table 17. Critical Fault Configuration
REGISTER
FLASH
ADDRESS ADDRESS
BIT
RANGE
DESCRIPTION
Fault Information to Log
00 = Save failed line flags and ADC values in flash
[1:0]
01 = Save only failed line flags in flash
6Dh
26Dh
10 = Save only ADC values in flash
11 = Do not save anything
[2]
1 = Fault log triggered when EXTFAULT is pulled low externally
[7:3]
Not used
[0]
1 = Fault log triggered when MON1 is below its undervoltage threshold
[1]
1 = Fault log triggered when MON2 is below its undervoltage threshold
[2]
1 = Fault log triggered when MON3 is below its undervoltage threshold
6Eh
26Eh
[3]
1 = Fault log triggered when MON4 is below its undervoltage threshold
[4]
1 = Fault log triggered when MON5 is below its undervoltage threshold
[5]
1 = Fault log triggered when MON6 is below its undervoltage threshold
[7:6]
Not used
[3:0]
Not used
[4]
1 = Fault log triggered when MON1 is above its overvoltage threshold
6Fh
26Fh
[5]
1 = Fault log triggered when MON2 is above its overvoltage threshold
[6]
1 = Fault log triggered when MON3 is above its overvoltage threshold
[7]
1 = Fault log triggered when MON4 is above its overvoltage threshold
[0]
1 = Fault log triggered when MON5 is above its overvoltage threshold
70h
270h
[1]
1 = Fault log triggered when MON6 is above its overvoltage threshold
[7:2]
Not used
71h
271h
[7:0]
Not used
[4:0]
Not used
1 = EXTFAULT pulled low externally causes sequencer to enter fault state, turning
72h
272h
[5]
off all EN_OUT_s
0 = EXTFAULT pulled low externally does not cause sequencer to enter fault state
[7:6]
Not used
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