20 PCM-5890 User's Manual
Front panel connector (CN6)
Next you may want to install external switches to monitor and
control the PCM-5890. These features are completely optional
install them only if you need them. The front panel connector
(CN6) is an 8-pin male, dual in-line header and provides connec-
tions for a speaker, hard disk access indicator and an input switch
for resetting the card.
Speaker
The PCM-5890 can drive an 8 W speaker at 0.5 watts. Ensure that
alternatives to this specification do not overload the card.
LED interface
The front panel LED indicator for hard disk access is an active
low signal (24 mA sink rate).
Reset switch
If you install a reset switch, it should be a open single pole
switch. Momentarily pressing the switch will activate a reset. The
switch should be rated for 10 mA, 5 V.
If you need to make your own cable, you can find the pin assign-
ments for the card’s connector in Appendix C.
Flat panel display connector (CN4)
CN4 consists of a 44-pin, dual-in-line header. Power supplies
(+12 V, -12 V) present on CN4 depend the supply connected to
the board. Ensure that both CN7 and CN15 are connected for ±12
V power supply.
The PCM-5890 provides a bias control signal on CN4 which can
be used to control the LCD bias voltage. It is recommended that
the LCD bias voltage not be applied to the panel until the logic
supply voltage (+5 V) and panel video signals are stable. Under
normal operation the control signal (ENAVEE) is active high.
When the PCM-5890's power is applied, the control signal is low
until just after the relevant flat panel signals are present.
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