EMC1413 datasheet(15/52 Pages) SMSC

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Multiple Channel 1°C Temperature Sensors with Beta Compensation

Datasheet

SMSC EMC1413 / EMC1414

Revision 1.41 (02-23-12)

DATASHEET

5.1.6

SMBus Stop Bit

The SMBus Stop bit is defined as a transition of the SMBus Data line from a logic ‘0’ state to a logic

‘1’ state while the SMBus clock line is in a logic ‘1’ state. When the device detects an SMBus Stop bit

and it has been communicating with the SMBus protocol, it will reset its client interface and prepare

to receive further communications.

5.1.7

SMBus Timeout

The EMC1413 / EMC1414 supports SMBus Timeout. If the clock line is held low for longer than 30ms,

the device will reset its SMBus protocol. This function can be enabled by setting the TIMEOUT bit in

the Consecutive Alert Register (see Section 7.12).

5.1.8

SMBus and I2C Compatibility

The EMC1413 / EMC1414 is compatible with SMBus and I2C. The major differences between SMBus

and I2C devices are highlighted here. For more information, refer to the SMBus 2.0 and I2C

specifications. For information on using the EMC1413 / EMC1414 in an I2C system, refer to SMSC AN

14.0 SMSC Dedicated Slave Devices in I2C Systems.

1. EMC1413 / EMC1414 supports I2C fast mode at 400kHz. This covers the SMBus max time of

100kHz.

2. Minimum frequency for SMBus communications is 10kHz.

3. The SMBus client protocol will reset if the clock is held at a logic ‘0’ for longer than 30ms. This

timeout functionality is disabled by default in the EMC1413 / EMC1414 and can be enabled by

writing to the TIMEOUT bit. I2C does not have a timeout.

4. I2C devices do not support the Alert Response Address functionality (which is optional for SMBus).

Attempting to communicate with the EMC1413 / EMC1414 SMBus interface with an invalid slave

address or invalid protocol will result in no response from the device and will not affect its register

contents. Stretching of the SMCLK signal is supported, provided other devices on the SMBus control

the timing.

5.2

SMBus Protocols

The device supports Send Byte, Read Byte, Write Byte, Receive Byte, and the Alert Response Address

as valid protocols as shown below.

All of the below protocols use the convention in Table 5.2.

Table 5.2 Protocol Format

DATA SENT

TO DEVICE

DATA SENT TO

THE HOST

# of bits sent

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