System information

Interfaces and Connectors
EBX-22 Reference Manual 48
ETHERNET CONNECTOR
Board-mounted RJ-45 connectors are provided to make connections with Category 5 Ethernet
cables. The 82551ER Ethernet controller auto-detects 10BaseT/100Base-TX connectors.
These connectors use IEC 61000-4-2-rated TVS components to help protect against ESD damage.
Table 20: RJ45 Ethernet Pinout
J5/J12
Pin
Signal
Name Function
1 T+ Transmit Data +
2 T- Transmit Data -
3 R+ Receive Data +
4 IGND Isolated Ground
5 IGND Isolated Ground
6 R- Receive Data -
7 IGND Isolated Ground
8 IGND Isolated Ground
CPU Temperature Monitor
A thermometer circuit constantly monitors the die temperature of the CPU. This circuit can be
used to detect over-temperature conditions which can result from heat sink failure or excessive
ambient temperatures.
The EBX-22 can be configured to generate an interrupt when the temperature exceeds
user-defined thresholds for CPU and board temperatures. CMOS Setup options on the Board tab
are used to set temperature thresholds from 0 to 255°C. The temperature IRQ is also selected on
the Board tab. Interrupts available are IRQ 3, 4, 5, and 10. (The NMI, non-maskable interrupt,
setting is reserved for future use).
Note: The IRQ for voltage and temperature monitoring is shared. When the Voltage or
Temperature IRQ option is set, the selected IRQ will apply to both voltage and
temperature monitoring if they are enabled.
See the SMSC SCH3114 Super I/O Chip data sheet
for information on reading and writing to the
thermometer circuits.