Miscellaneous circuits, Speaker, Battery – Kontron COMe-cTH6 User Manual
Page 38: C bus, Smbus, 12 miscellaneous circuits, 1 speaker, 2 battery, 4 smbus
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COMe-cTH6 User’s Guide
www.kontron.com
5.12 Miscellaneous Circuits
5.12.1 Speaker
The implementation of this subsystem complies with the COM Express® Specification. For additional implementation
information, refer to the PICMG COM Express® Design Guide.
5.12.2 Battery
The implementation of this subsystem complies with the COM Express® specification. For additional implementation
information, refer to the
PICMG COM Express® Design Guide
on the PICMG website.
The COM Express® Rev 2.0 specification requires the carrier board and the module to have two current-limiting
devices (resistor and diode) between the battery and the consuming component.
5.12.3 I
2
C Bus
The I
2
C bus implementation supports on- and off-module use. The I
2
C controller is implemented within the CPLD. The
I
2
C implementation is an I
2
C master with 7- bit I
2
C addressing, capable of 100 KHz or 400 KHz operation.
COM Express Rev 2 specifies I
2
C on the standby rail now, so in the S5 state a carrier board I
2
C master can query the
module. The COMe cTH6 I
2
C bus is multi-master capable.
For additional information, refer to the
PICMG COM Express® Design Guide
on the PICMG website and I
2
C application
notes, which are available on the Kontron website a
See Chapter 9, “BIOS Operation” for supported I
2
C features.
5.12.4 SMBus
System Management Bus (SMBus) signals are connected to the SMBus controller, which is located on the AMD Fusion
Controller Hub. The SMBus is a 2-wire, bi-directional bus (clock and serial data) used for system management tasks
such as reading parameters from a memory card or reading temperatures and voltages of system components.
The implementation complies with the COM Express® specification. For additional implementation information, refer
to the
PICMG COM Express® Design Guide
on the PICMG website
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DRAFT COPY FOR REVIEW ONLY