Kontron KTQM87-mITX - Manual (Page 32)

KTD-N0886-A Page 30 Internal Connectors
KTQM87/mITX Users Guide
7 Internal Connectors
Power Connector (ATX+12V-24p) (J20) 7.1
The KTQM87 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+12V-24p 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
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-4p Power Connector (J21):
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 ATX+12V-4p in Power Connector is required for operation of KTQM87.
Warning: Hot plugging any of the two power connectors (J20 and J21) is not allowed. Hot plugging might
damage the board. In other words, turn off main supply etc. to makesure all the power lines (+12V, 5V,
SB5V, 3.3V, -5V, -12V) are turned off when connecting to the motherboard.
Signal Description
P_OK P_OK is power good signal driven by the ATX Power Supply and indicating that the +5VDC and
+3.3VDC outputs are above the undervoltage thresholds.
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 provide 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.