Rainbow Electronics MAX16064 - Manual (Page 35)

MAX16064
±0.3% Accurate, Quad, Power-Supply Controller with
Active-Voltage Output Control and PMBus Interface
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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 5. OPERATION Command Byte
COMMAND BYTE POWER SUPPLY ON OR OFF MARGIN STATE
00h Immediate off (no sequencing) —
40h Soft-off (with sequencing) —
80h On Margin off (nominal)
94h On Margin low (ignore fault)
98h On Margin low (act on fault)
A4h On Margin high (ignore fault)
A8h On Margin high (act on fault)
Table 6. ON_OFF_CONFIG Message Contents
BIT NUMBER PURPOSE MEANING
[7:5] Reserved. Always returns 000.
4
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]).
3
Controls how the power supply
responds to commands received over
the serial bus
0 = Power supply ignores the on/off portion of the OPERATION
command received from 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).
2
Configures how the power supply
responds to the A3/CONTROL input
0 = Power supply ignores the A3/CONTROL input. On/off is only
controlled by the OPERATION command.
1 = Power supply requires the A3/CONTROL input to be asserted to
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).
1 Polarity of the A3/CONTROL input
0 = A3/CONTROL input is active low. Drive low to turn on the power
supply.
1 = A3/CONTROL input is active high. Drive high to turn on the power
supply.
0
A3/CONTROL input action when
commanding the power supply to
turn off
0 = Use the configured turn off delay (TOFF_DELAY) and fall time
(TOFF_FALL).
1 = Turn off the power supply as quickly as possible (deassert ENOUT).