KTD-00782-H KTQ45 family Page 27 of 92
3.2 Power Connector (ATXPWR)
The KTQ45 boards are designed to be supplied from a standard ATX or BTX power supply.
ATX/ BTX Power Connector:
Note 1: -5V supply is not used onboard.
Note: Use of BTX supply not required for operation, but may be required to drive high-power PCIe cards.
See chapter “Power Consumption” regarding input tolerances on 3.3V, 5V, SB5V, +12 and -12V (also refer
to ATX specification version 2.2).
ATX+12V-6pin Power Connector (same net as +12V in ATX/BTX Power connector):
ATX+12V-4pin Power Connector:
Note 1: Use of the 4-pin ATX+12V Power Connector is required for operation of the KTQ45 boards.
Signal Description
P_OK
P_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 under voltage 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 under voltage
threshold, or when mains power has been
removed for a time sufficiently long so that power supply operation is no longer guaranteed,
P_OK should be de-
asserted to a low state. The recommended electrical and timing
characteristics of the P_OK (PWR_OK) signal are provided in the ATX12V Power Supply
Design Guide.
It is strongly recommended to use an ATX or BTX supply with the KTQ45 boards, in order to
implement the supervision of the 5V and 3V3 supplies. These supplies are not supervised
onboard the KTQ45 boards.
PS_ON# 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.
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