Kontron 986LCD-M-mITX (BGA) - Manual (Page 27)

986LCD-M Family
KTD-N0837-B Public User Manual Date: 2012-04-17 Page 27 of 91
4.2 Power Connector (ATXPWR)
The 986LCD-M boards are designed to be supplied from a standard ATX or BTX power supply.
ATX/ BTX Power Connector:
Note
Pull
U/D Ioh/Iol Type Signal
PIN
Signal Type Ioh/Iol
Pull
U/D 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 2: Use of BTX supply not required for operation, but may be required to drive high-power PCI Express
x16 Add cards.
ATX+12V Power Connector:
Note
Pull
U/D Ioh/Iol Type Signal
PIN
Signal Type Ioh/Iol
Pull
U/D Note
1 - - PWR GND 1 3 +12V PWR - - 1
1 PWR GND 2 4 +12V PWR 1
Note 1: Use of the 4-pin ATX+12V Power Connector is required for operation of the 986LCD-M boards.
See chapter “Power Consumption” regarding input tolerances on 3.3V, 5V, SB5V, +12 and -12V (also refer to
ATX specification).
Control signal description:
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 986LCD-M boards, in order
to implement the supervision of the 5V and 3V3 supplies. These supplies are not supervised
onboard the 986LCD-M 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.