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Pin
Signal
20
-5V
21
+5V
22
+5V
23
+5V
24
GND
Table 18: Signal Description
Signal
POWER OK
PS_ON
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Description
Ground
Description
POWER_OK is a power good signal and should be asserted high by the power supply to
indicate that the +5VDC and +3.3VDC outputs are above the undervoltage thresholds of the
power supply. When this signal is asserted high, there should be sufficient energy stored
by the converter to guarantee continuous power operation within specification.
Conversely, when the output voltages fall below the undervoltage threshold, or when
mains power has been removed for a time sufficiently long so that power supply operation
is no longer guaranteed, POWER_OK should be de-asserted to a low state. The
recommended electrical and timing characteristics of the POWER_OK signal are provided
in the ATX12V Power SupplyDesign Guide.
It is strongly recommended to use an ATX supply, in order to implement the supervision of
the 5V and 3V3 supplies. These supplies are not supervised on-board.
Active low open drain signal from the board to the power supply to turn on the power
supply outputs. Signal must be pulled high by the power supply.
mITX-DNV - User Guide, Rev. 1.0
// 32
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