Kontron KTGM45-mITX - Manual (Page 27)

KTGM45 Users Guide
KTD-N0793-O Page 27
3.2 Power Connector (ATX/BTXPWR)
The KTGM45 boards are designed to be supplied from a standard ATX (or BTX) power supply or by single
+12V. Use of BTX supply is not required for operation, but may be required to drive high-power PCIe cards.
In case of the KTGM45/mITX or in case of other versions of KTGM45 where the total power load from PCI
and PCIe slots are limited to one full load for each type of connector, then the ATX/BTXPWR connector can
be unconnected, so that the ATX+12V is the only voltage (12V +/-5%) supplied.
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 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).
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 KTGM45 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 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 with the KTGM45 boards, in order
to implement the supervision of the 5V and 3V3 supplies. These supplies are not supervised
on-board the KTGM45 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.
Connector Definitions