MAX16064 Datasheet, PDF (35/52 Pages) Maxim Integrated Products – ±0.3% Accurate, Quad, Power-Supply Controller with Active-Voltage Output Control and PMBus Interface

±0.3% Accurate, Quad, Power-Supply Controller with
Active-Voltage Output Control and PMBus Interface
Table 5. OPERATION Command Byte
COMMAND BYTE
00h
40h
80h
94h
98h
A4h
A8h
POWER SUPPLY ON OR OFF
Immediate off (no sequencing)
Soft-off (with sequencing)
On
On
On
On
On
MARGIN STATE
—
—
Margin off (nominal)
Margin low (ignore fault)
Margin low (act on fault)
Margin high (ignore fault)
Margin high (act on fault)
ON_OFF_CONFIG (02h)
The ON_OFF_CONFIG command configures the com-
bination of CONTROL input and serial bus commands
needed to turn the power supply on and off. This indi-
cates how the power supply is commanded when
power is applied. The ON_OFF_CONFIG message con-
tent is described in Table 6.
CLEAR_FAULTS (03h)
The CLEAR_FAULTS command is used to clear any
fault bits that have been set. This command clears all
bits in the STATUS_BYTE and MFR_FAULT_STATUS
registers simultaneously. It also deasserts SMBALERT.
The CLEAR_FAULTS command does not cause a
power supply that has latched off for a fault condition to
Table 6. ON_OFF_CONFIG Message Contents
BIT NUMBER
[7:5]
4
PURPOSE
MEANING
Reserved. Always returns 000.
Sets the default to operate either any
time power is present or for the on/off to
be controlled by A3/CONTROL input
and serial bus commands
0 = Power supply turns on (ENOUT goes high) any time power is
present regardless of the state of the A3/CONTROL pin.
1 = Power supply is not turned on until commanded by the
CONTROL pin and OPERATION command (as configured in bits
[3:0]).
0 = Power supply ignores the on/off portion of the OPERATION
command received from the serial bus.
3
Controls how the power supply
responds to commands received over
the serial bus
1 = An operation command must be received to turn the power supply
on. Depending on bit [2], the MAX16064 may require the
A3/CONTROL input to be asserted for the power supply to be
turned on (ENOUT asserted).
0 = Power supply ignores the A3/CONTROL input. On/off is only
controlled by the OPERATION command.
Configures how the power supply
1 = Power supply requires the A3/CONTROL input to be asserted to
2
responds to the A3/CONTROL input
turn on the power supply. Depending on bit [3], the MAX16064 may
require the OPERATION command to be received for the power
supply to be turned on (ENOUT asserted).
0 = A3/CONTROL input is active low. Drive low to turn on the power
1
Polarity of the A3/CONTROL input
supply.
1 = A3/CONTROL input is active high. Drive high to turn on the power
supply.
A3/CONTROL input action when
0 = Use the configured turn off delay (TOFF_DELAY) and fall time
0
commanding the power supply to
(TOFF_FALL).
turn off
1 = Turn off the power supply as quickly as possible (deassert ENOUT).
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