Fortec Star CM1-BT1, Руководство пользователя

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Module Description 25
CMx-BTx
3.8 System Panel
The System Panel interface provides signals for external speakers, HDD LEDs, and power and
reset buttons. The HDD-LED (K) on pin 7 includes a 680 Ohm series resistor for current limiting.
The Anode of the LED should be connected to pin 2 (+V3P3S.)
For the speaker, ADLINK recommends speaker impedance at 8Ohm to 50Ohm and speaker
power rating up to 1.0W.
The +V3P3S signal on pin 2 is fused with a slow-acting PTC-like, 750mA fuse. The same is true
for the SPKR-OUT (+) signal on pin 3, but it is not recommended to draw more than 200mA from
pin 3.
The cable set provided includes a cable for the system panel, which includes a power and reset
button, while the other wires are open-end. The PMC_RSTBTN_IN# (reset) includes a 1k pull-
up resistor to a switched 3.3V, while the PS_PWRBTN_IN# includes a 3k3 pull up to an always
on 3.3V.
The following table defines the pin assignments of the System Panel functions.
To connect an external RTC battery, use the system panel, open-end cable wires
connected to pin 5 and pin 8 on CN20.
Table 3-9: System Panel Interface (CN20)
Pin Signal Pin Signal
1 SPKR-IN (-) 2 +V3P3S
3 SPKR-OUT (+) 4 GND
5 +VCC_RTC_EXT 6 PS_PWRBTN_IN#
7 HDD-LED (K) 8 GND
9 WDTOUT 10 PMC_RSTBTN_IN#
Function Related Pins
Power Button 4 and 6
Speaker 1 and 3
Reset 4 and 10
RTC-Battery 5 and 8
Watchdog-Out 8 and 9
HDD-LED 2 and 7
1
CN20