Environmental Monitoring and Control Device
Datasheet
The only valid registers that are accessible by the SMBus slave address are the registers defined in the
Registers Section. See section below for response to undefined registers.
5.4.1 UNDEFINED REGISTERS
Reads to undefined registers return 00h. Writes to undefined registers have no effect and return no error.
5.5
5.6
General Call Address Response
The EMC device will not respond to a general call address of 0000_000.
Slave Device Time-Out
According to SMBus specification, v2.0 devices in a transfer can abort the transfer in progress and release
the bus when any single clock low interval exceeds 25ms (TTIMEOUT, MIN). Devices that have detected this
condition must reset their communication and be able to receive a new START condition no later than
35ms (TTIMEOUT, MAX).
Note: Some simple devices do not contain a clock low drive circuit; this simple kind of device typically
may reset its communications port after a start or stop condition
5.7
5.8
5.9
Stretching the SCLK Signal
The EMC device supports stretching of the SCLK by other devices on the SMBus. The EMC device does
not stretch the SCLK.
SMBus Timing
The SMBus Slave Interface complies with the SMBus AC Timing Specification. See the SMBus timing in
the “Timing Diagram” section.
Bus Reset Sequence
The SMBus Slave Interface will reset and return to the idle state upon a START field followed immediately
by a STOP field.
5.10 SMBus Alert Response Address
EMC6D100:
The EMC6D100 device implements the SMBALERT# signal. The INT# interrupt pin can be used as the
SMBALERT#. SMBALERT# is used in conjunction with the SMBus General Call Address, 0001 100. In
order for the INT# signal to become active and for the device to respond to the Alert Response address,
the INTEN bit (register 7Ch bit 2) must be set and the event must be properly enabled onto the INT# pin.
Each interrupt event must be enabled into the interrupt status registers, and the status bits must be
SMSC EMC6D100/EMC6D101
Page 19
Rev. 09-09-04
DATASHEET
SMSC [ SMSC CORPORATION ]
