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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 slave

through header, J24. The SMBus slave includes the CPU Temperature Monitor. Table 3-15 lists the device

name and corresponding reserved binary address 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 3-17 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 (Hex)

CPU Temperature Monitor 4C

Table 3-16. SMBus Pin Signals (J24)

Pin # Signal Description

1 SMB_CLK SMBus Clock

GND Ground

3 SMB_DATA SMBus Data

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

+5V +5 volts power

GND Ground



1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 61 62

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