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KTD-N0876-0
7
Pin Connectors
7.1 DC Power ATX-BTX Connector (J17)
The KTA75 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-BTX Power Connector (J17):
Header
Note
Type
PWR
PWR
PWR
PWR
I
PWR
PWR
PWR
PWR
PWR
PWR
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).
Signal
Description
P_OK is a power good signal and should be asserted high by the power supply
P_OK
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 in order to implement the
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.
Page 29
Signal
PIN
Signal
3V3
12
24
GND
+12V
11
23
5V
+12V
10
22
5V
SB5V
9
21
5V
P_OK
8
20
-5V
GND
7
19
GND
5V
6
18
GND
GND
5
17
GND
5V
4
16
PSON#
GND
3
15
GND
3V3
2
14
-12V
3V3
1
13
3V3
KTA75/Flex Users Guide
KTA75/Flex Users Guide
Connector Signal Definition
Type
Note
PWR
PWR
PWR
PWR
PWR
1
PWR
PWR
PWR
OC
PWR
PWR
PWR
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