Kontron KTA75-FLEX - Manual (Page 30)

KTD-N0861-B Page 22 Pin Connectors
KTA75/Flex Users Guide
KTA70M/mITX Users Guide
7 Pin Connectors
7.1 24-pin ATX-BTX Power Connector (J17)
The KTA75 boards are designed to be supplied from a standard ATX (or BTX) power supply. Use of BTX supply
is not required for operation, but may be required to drive high-power PCIe cards.
ATX-BTX Power Connector (J17):
Header Note Type Signal PIN Signal Type Note
PWR 3V3 12 24 GND PWR
PWR +12V 11 23 5V PWR
PWR +12V 10 22 5V PWR
PWR SB5V 9 21 5V PWR
I P_OK 8 20 -5V PWR 1
PWR GND 7 19 GND PWR
PWR 5V 6 18 GND PWR
PWR GND 5 17 GND PWR
PWR 5V 4 16 PSON# OC
PWR GND 3 15 GND PWR
PWR 3V3 2 14 -12V PWR
PWR 3V3 1 13 3V3 PWR
Note 1: -5V supply is not used on-board.
See chapter “Power Consumption” regarding input tolerances on 3.3V, 5V, SB5V, +12 and -12V (also refer
to ATX specification version 2.2).
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 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, 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 SupplyDesign Guide.
It is strongly recommended to use an ATX or BTX supply in order to implement the supervision
of the 5V and 3V3 supplies. These supplies are not supervised on-board.
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.