Kontron KTT20-pITX - Manual (Page 38)

KTD-S0044-G Page 34 Power Supply
KTT20/pITX User's Guide
15.4 Power Front Panel Header
The power button and other power signals are available through the pin header J900 (10 pins).
Header Pin Signal Description Type
1 RST_BTN+ Reset button (positive) I-18
2 PWR_BTN+ Power button (positive) I-18
3 RST_BTN- Reset button (negative) = GND PWR
4 PWR_BTN- Power button (negative) = GND PWR
5 POWER_LED- Power LED (negative) = GND PWR
6 RSVD Reserved ---
7 POWER_LED+ Power LED (positive) O-33 / PWR
8 RSVD Reserved ---
9 RSVD Reserved ---
1 2
9 10
10 RSVD Reserved ---
Note: 1) The label PWR_BTN (power button) is identical with NVIDIAs
®
'ONKEY' button.
CAUTION!
If you apply a discrete logic circuit instead the standard buttons to control the
reset respectively power button inputs then you should use open drain outputs
without a pullup resistor.
15.4.1 Power LED
The following picture illustrates the onboard wiring.
+3.3V
220R
C
o
nn
e
c
to
r
+
-
Power LED -
Power LED +