EMC1422 SMSC Corporation, EMC1422 Datasheet - Page 13

• Manufacturer Part Number: EMC1422
• Description: 1C Temperature Sensor
• Manufacturer: SMSC Corporation

1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
SMSC EMC1422
4.3
4.4
4.5
4.6
START
1
START
START
START
1
1
1
ADDRESS
SLAVE
Read Byte
Send Byte
Receive Byte
Alert Response Address
7
The Read Byte protocol is used to read one byte of data from the registers as shown in
The Send Byte protocol is used to set the internal address register pointer to the correct address
location. No data is transferred during the Send Byte protocol as shown in
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 is used for consecutive reads
of the same register as shown in
The ALERT output can be used as a processor interrupt or as an SMBus Alert.
When it detects that the ALERT pin is asserted, the host will send the Alert Response Address (ARA)
to the general address of 000_1100b. All devices with active interrupts will respond with their client
address as shown in
RESPONSE
ADDRESS
ADDRESS
ADDRESS
WR
SLAVE
SLAVE
1
ALERT
7
7
7
ACK
1
Table 4.6 Alert Response Address Protocol
REGISTER
ADDRESS
Table
8
Table 4.5 Receive Byte Protocol
WR
4.6.
RD
Table 4.3 Read Byte Protocol
Table 4.4 Send Byte Protocol
1
1
RD
1
ACK
Table
DATASHEET
1
4.5.
START
ACK
ACK
ACK
13
1
1
1
1
ADDRESS
SLAVE
REGISTER DATA
7
REGISTER
ADDRESS
ADDRESS
DEVICE
8
8
RD
8
1
ACK
1
REGISTER
Table
NACK
DATA
NACK
ACK
8
1
1
1
Revision 1.16 (03-15-07)
4.4.
NACK
Table
1
STOP
STOP
STOP
1
1
1
4.3.
STOP
1