Eurotech CPU-1450, Руководство пользователя, Страница: 17 / 43

17 CPU-1450 Power management connections
Serial 1 & Serial 2
The CPU-1450 J8 connector is used for the Parallel, Serial 1 and Serial 2 ports. In the soft power
management the
Ring Indicator signal on the Serial sections can be used as a wake-up event.
The signal level applied to the RI pins should be greater than 3V because this signal is applied to a GATE of
a transistor that drives the RI pin of the ICH2. Furthermore,
the high level must be applied using a current
limiting resistor . The limiting resistor should be 1-kOhm for each volt applied, limiting the current below 1mA.
Parallel
Serial1, Serial2
Figure 4. J8 Connector Layout
Serial 1
Pin # Description Pin # Description
23 DCD1 24 DSR1
25 RX1 26 RTS1
27 TX1 28 CTS1
29 DTR1 30 RI1
Serial 2
Pin # Description Pin # Description
31 GND 32 DCD2
33 DSR2 34 RX2
35 RTS2 36 TX2
37 CTS2 38 DTR2
39 RI2 40 GND
An0065. CPU-1450 Soft Power Management
Table 6. J8 Connector pin out