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PCA-6774 User Manual 16
2.10 ATX power control connector (CN20,CN21)
2.10.1 ATX feature connector (CN20) and soft-on power
button connector (CN21)
The PCA-6774 can support an advanced soft power switch function, if an
ATX power supply is used. To enable the soft power switch function:
1. Get the specially designed ATX-to-EBX power cable
(PCA-6774 optional item, Part No. 1703200100)
2. Connect the 3-pin plug of the cable to CN20 (ATX feature connec-
tor).
3. Connect the power on/off button to CN21. (A momentary type of
button should be used.)
Important Make sure that the ATX power supply can take
at least a 10 mA load on the 5 V standby lead
(5VSB). If not, you may have difficulty power-
ing on your system.
Figure 2.3: Wiring for ATX soft power switch function
to CN1 ATX
features connector
ATX
power supply
to main power
connector CN8
20-pin
female connector