1.5°C SMBus Temperature Sensor in Miniature SOT-23
Datasheet
3.4
Receive Byte
The Receive Byte protocol is used to read data from a register when the internal register address pointer
is known to be at the right location (e.g. set via Send Byte). This can be used for consecutive reads of
the same register as shown below:
Table 3.4 SMBus Receive Byte Protocol
FIELD:
Bits:
START
1
SLAVE ADDR
7
RD
1
ACK
1
REG. DATA
8
NACK
1
STOP
1
3.5
Alert Response Address
The
ALERT
/
THERM2
output can be used as an SMBALERT# as described in
The Alert Response Address is polled by the Host whenever it detects an
SMBALERT#, i.e. when the
ALERT
/
THERM2
pin is asserted. The EMC1001 will acknowlege the Alert
Response Address and respond with its device address as shown below.
Table 3.5 Modified SMBus Receive Byte Protocol Response to ARA
ALERT
RESPONSE
ADDRESS
7
FIELD:
Bits:
START
1
RD
1
ACK
1
EMC1001 SLAVE
ADDRESS
8
NACK
1
STOP
1
3.6
SMBus Addresses
The EMC1001 is available in two versions, each of which has four 7-bit slave addresses that are
enabled based on the pull-up resistor on the
ADDR
/
THERM
pin. The value of this pull up resistor
determines the slave address per
Attempting to communicate with the EMC1001
SMBus interface with an invalid slave address or invalid protocol results in no response from the device
and does not affect its register contents. The EMC1001 supports stretching of the SMCLK signal by
other devices on the SMBus but will not perform this operation itself. The EMC1001 has an SMBus
timeout feature. Bit 7 of the SMBus Timeout Enable register enables this function when set to 1 (the
default setting is 0). When this feature is enabled, the SMBus will timeout after approximately 25ms
of inactivity.
Revision 1.6 (01-29-07)
8
SMSC EMC1001
DATASHEET
SMSC [ SMSC CORPORATION ]
