MAX16067 Datasheet, PDF (12/47 Pages) Maxim Integrated Products – 6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers

6-Channel, Flash-Configurable System Manager
with Nonvolatile Fault Registers
Table 3. Power-Up/Power-Down Slot Delays
Code
0000 0000
Value
( ) ( ) ^tSEQ ^{= 5 ×10 −6 × 2a × (16 + b) = 5 ×10 −6 × 20 × (16 + 0) = 80µs}
•
•
•
1111 1111
•
•
•
( ) ( ) ^tSEQ ^{= 5 ×10 −6 × 2a × (16 + b) = 5 ×10 −6 × 215 × (16 + 15) = 5.079s}
Table 4. Software Enable Configurations
REGISTER
ADDRESS
73h
FLASH
ADDRESS
273h
BIT RANGE
DESCRIPTION
Software enable
[0]
1 = Sequencing enabled
0 = Power-down
[1]
Reserved
[2]
1 = Margin mode enabled
[3]
Reserved
Independent watchdog mode enable
[4]
1 = Watchdog timer is independent of sequencer
0 = Watchdog timer boots after sequence completes
Monitoring Inputs While Sequencing
An enabled MON_ input can be assigned to a slot
ranging from Slot 1 to Slot 6. EN_OUT_s are always
asserted at the beginning of a slot. The supply voltages
connected to the MON_ inputs must exceed the under-
voltage threshold before the programmed fault timeout
period expires, otherwise, a fault condition occurs. Once
a MON_ input crosses the undervoltage threshold, the
monitoring for overvoltage begins. The undervoltage
and overvoltage threshold checking cannot be disabled
during power-up and power-down. See Tables 5 and
6 for the MON_ slot assignment bits. The programmed
sequence delay is then counted before moving to the
next slot.
Slot 0 does not monitor any MON_ input and does not
control any EN_OUT_. Slot 0 waits for the software
enable bit r73h[0] to be a logic-high and for the voltage
on EN to rise above 1.24V (typ) before initiating the pow-
er-up sequence and counting its own sequence delay.
Any MON_ input that suffers a fault during power-up
sequencing causes all the EN_OUT_s to turn off and
the sequencer to shut down regardless of the state of
the critical fault enables (see the Faults section). If a
MON_ input is less critical to system operation, it can
be configured as “monitoring only” (see Table 6a) for
sequencing. Monitoring for MON_ inputs assigned as
“monitoring only” begins after sequencing is complete,
and can trigger a critical fault only if specifically config-
ured to do so using the critical fault enables.
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