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TMP275 데이터시트(PDF) 10 Page - Texas Instruments

부품명 TMP275
상세설명  TMP275 짹0.5째C Temperature Sensor With I2C and SMBus Interface in Industry Standard LM75 Form Factor and Pinout
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TMP275
SBOS363E – JUNE 2006 – REVISED NOVEMBER 2015
www.ti.com
When reading from the TMP275, the last value stored in the Pointer Register by a write operation is used to
determine which register is read by a read operation. To change the register pointer for a read operation, a new
value must be written to the Pointer Register. This is accomplished by issuing a slave address byte with the R/W
bit LOW, followed by the Pointer Register Byte. No additional data is required. The master can then generate a
START condition and send the slave address byte with the R/W bit HIGH to initiate the read command. See
Figure 9 for details of this sequence. If repeated reads from the same register are desired, it is not necessary to
continually send the Pointer Register bytes, as the TMP275 remembers the Pointer Register value until it is
changed by the next write operation.
Note that register bytes are sent most-significant byte first, followed by the least significant byte.
7.3.4.2 Slave Mode Operations
The TMP275 can operate as a slave receiver or slave transmitter.
7.3.4.2.1
Slave Receiver Mode
The first byte transmitted by the master is the slave address, with the R/W bit LOW. The TMP275 then
acknowledges reception of a valid address. The next byte transmitted by the master is the Pointer Register. The
TMP275 then acknowledges reception of the Pointer Register byte. The next byte or bytes are written to the
register addressed by the Pointer Register. The TMP275 acknowledges reception of each data byte. The master
may terminate data transfer by generating a START or STOP condition.
7.3.4.2.2
Slave Transmitter Mode
The first byte is transmitted by the master and is the slave address, with the R/W bit HIGH. The slave
acknowledges reception of a valid slave address. The next byte is transmitted by the slave and is the most
significant byte of the register indicated by the Pointer Register. The master acknowledges reception of the data
byte. The next byte transmitted by the slave is the least significant byte. The master acknowledges reception of
the data byte. The master may terminate data transfer by generating a Not-Acknowledge on reception of any
data byte, or generating a START or STOP condition.
7.3.4.3 SMBus Alert Function
The TMP275 supports the SMBus Alert function. When the TMP275 is operating in Interrupt Mode (TM = 1), the
ALERT pin of the TMP275 may be connected as an SMBus Alert signal. When a master senses that an ALERT
condition is present on the ALERT line, the master sends an SMBus Alert command (00011001) on the bus. If
the ALERT pin of the TMP275 is active, the device acknowledges the SMBus Alert command and responds by
returning its slave address on the SDA line. The eighth bit (LSB) of the slave address byte indicates if the
temperature exceeding THIGH or falling below TLOW caused the ALERT condition. This bit will be HIGH if the
temperature is greater than or equal to THIGH. This bit will be LOW if the temperature is less than TLOW. Refer to
Figure 10 for details of this sequence.
If multiple devices on the bus respond to the SMBus Alert command, arbitration during the slave address portion
of the SMBus Alert command determines which device clears its ALERT status. If the TMP275 wins the
arbitration, its ALERT pin becomes inactive at the completion of the SMBus Alert command. If the TMP275 loses
the arbitration, its ALERT pin remains active.
7.3.4.4 General Call
The TMP275 responds to a Two-Wire General Call address (0000000) if the eighth bit is 0. The device
acknowledges the General Call address and responds to commands in the second byte. If the second byte is
00000100, the TMP275 latches the status of their address pins, but will not reset. If the second byte is
00000110, the TMP275 latches the status of their address pins and reset their internal registers to their power-up
values.
10
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