EMC1001 Standard Microsystems Corp., EMC1001 Datasheet - Page 8

• Manufacturer Part Number: EMC1001
• Description: Emc1001 1.5?c Smbus Temperature Sensor In Miniature Sot-23
• Manufacturer: Standard Microsystems Corp.

Revision 1.6 (01-29-07)
3.4
3.5
3.6
FIELD:
Bits:
FIELD:
Bits:
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:
The
Output," on page
SMBALERT#, i.e. when the
Response Address and respond with its device address as shown below.
START
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
determines the slave address per
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.
Receive Byte
Alert Response Address
SMBus Addresses
1
START
ALERT
1
Table 3.5 Modified SMBus Receive Byte Protocol Response to ARA
/
THERM2
RESPONSE
ADDRESS
ALERT
SLAVE ADDR
11. The Alert Response Address is polled by the Host whenever it detects an
7
output can be used as an SMBALERT# as described in
Table 3.4 SMBus Receive Byte Protocol
7
ALERT
RD
1
/
Table 1.2 on page
THERM2
DATASHEET
RD
1
ACK
1
8
pin is asserted. The EMC1001 will acknowlege the Alert
ACK
ADDR
1
3. Attempting to communicate with the EMC1001
1.5°C SMBus Temperature Sensor in Miniature SOT-23
/
EMC1001 SLAVE
THERM
ADDRESS
REG. DATA
pin. The value of this pull up resistor
8
8
4.3, "ALERT/THERM2
NACK
NACK
1
1
SMSC EMC1001
Datasheet
STOP
STOP
1
1