Specifications

Chapter 3 Hardware
CoreModule 720 Reference Manual 31
System Management Bus (SMBus)
The E6XXT chip contains a host SMBus port. The host port allows the CPU access to the SMBus slaves
through header, J24. The SMBus slaves include the Gigatbit Ethernet Controller and the CPU Temperature
Monitor. Table 3-15 lists the device names and corresponding reserved binary addresses on the SMBus.
Table 3-16 lists the SMBus pin signals on 5 pins, 1 row, 0.079" (2mm) pitch.
Note: The shaded table cells denote power or ground. The * symbol indicates the signal is Active Low.
CAN Bus Interface
The CAN controller resides in the PCH and performs communication in accordance with the Bosch CAN
Protocol version 2.0B Active (standard and extended formats.) The CAN transceiver connects the CAN
controller to the CAN bus, and transmits and receives CAN signals to and from the CAN header (J4). The
CAN interface delivers CAN signals used for automotive, industrial automation, and medical scanning and
imaging applications. The following list describes some of the features of the CAN Bus Interface.
♦ +/- 12 kV ESD protection
♦ Low-current Standby mode with bus wake up: 5 A typical
♦ Bus-fault protection of -27V to 40V
♦ Over-temperature shutdown
Table 3-14 defines the pin signals of the CAN bus interface, which provides a 4-pin, single-row header with
0.079" (2mm) pitch.
Note: The shaded table cells denote power or ground.
Table 3-15. SMBus Reserved Addresses
Component Address (Binary)
CPU Temperature Monitor 1001,100x
b
Gigabit Ethernet Controller 1100,001x
b
Table 3-16. SMBus Pin Signals (J24)
Pin # Signal Description
1 SMB_CLK SMBus Clock
2
GND Ground
3 SMB_DATA SMBus Data
4
VSM +3.3V standby voltage
5 SMB_ALERT* SMBus Alert
Table 3-17. CAN Interface Pin Signals (J4)
Pin # Signal Description
1 CAN_L Dominant Low
2 CAN_H Dominant High
3
+5V +5 volts power
4
GND Ground
μ