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KTD-N0882-H Page 39 Internal Connectors

KTQ87/KTH81 Users Guide

7 Internal Connectors

The KTQ87/KTH81 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.

Warning: Hot plugging any of the two power connectors 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.

Note 1: Use of both the ATX24P and the ATX4p connectors are required for operation of the KTQ87/KTH81.

7.1 Power Connector (ATX24P)

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).

7.2 Power Connector (ATX4p)

Note Type Signal PIN Signal Type Note

PWR GND 2 4 +12V PWR 1

PWR GND 1 3 +12V PWR 1

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.

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