Kontron KTQ45-FLEX - Manual (Page 27)

KTD-00782-I 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 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 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):
Note Type Signal PIN Signal Type Note
1 PWR +12V 3 6 GND PWR
1 PWR +12V 2 5 GND PWR
PWR +12V 1 4 GND PWR
ATX+12V-4pin Power Connector:
Note Type Signal PIN Signal Type Note
PWR GND 2 4 +12V PWR 1
PWR GND 1 3 +12V PWR 1
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.