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TMP101 Arkusz danych(PDF) 10 Page - Texas Instruments

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Numer części TMP101
Szczegółowy opis  TMP10x Temperature Sensor With I2C and SMBus Interface with Alert Function in SOT-23 Package
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Strona internetowa  http://www.ti.com
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TMP101 Arkusz danych(HTML) 10 Page - Texas Instruments

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TMP100, TMP101
SBOS231I – JANUARY 2002 – REVISED NOVEMBER 2015
www.ti.com
7.3.2.2 Serial Bus Address
To program the TMP100 and TMP101 devices, the master must first address slave devices through a slave
address byte. The slave address byte consists of seven address bits and a direction bit indicating the intent of
executing a read or write operation.
The TMP100 device features two address pins to allow up to eight devices to be addressed on a single I2C
interface. Table 2 describes the pin logic levels used to properly connect up to eight devices. Float indicates the
pin is left unconnected. The state of pins ADD0 and ADD1 is sampled on the first I2C bus communication and
must be set before any activity on the interface.
Table 2. Address Pins and Slave Addresses for the TMP100
ADD1
ADD0
SLAVE ADDRESS
0
0
1001000
0
Float
1001001
0
1
1001010
1
0
1001100
1
Float
1001101
1
1
1001110
Float
0
1001011
Float
1
1001111
The TMP101 device features one address pin and an ALERT pin, allowing up to three devices to be connected
per bus. Pin logic levels are described in Table 3. The address pins of the TMP100 and TMP101 devices are
read after reset or in response to an I2C address acquire request. Following reading, the state of the address
pins is latched to minimize power dissipation associated with detection.
Table 3. Address Pins and Slave Addresses for the TMP101
ADD0
SLAVE ADDRESS
0
1001000
Float
1001001
1
1001010
7.3.2.3 Writing and Reading to the TMP100 and TMP101
Accessing a particular register on the TMP100 and TMP101 devices is accomplished by writing the appropriate
value to the Pointer Register. The value for the Pointer Register is the first byte transferred after the I2C slave
address byte with the R/W bit LOW. Every write operation to the TMP100 and TMP101 devices requires a value
for the Pointer Register (see Figure 7).
When reading from the TMP100 and TMP101 devices, 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 action is accomplished by issuing an
I2C slave address byte with the R/W bit LOW, followed by the Pointer Register Byte. No additional data are
required. The master can then generate a START condition and send the I2C slave address byte with the R/W bit
HIGH to initiate the read command; see Figure 8 for details of this sequence. If repeated reads from the same
register are desired, the Pointer Register bytes do not have to be continually sent because the TMP100 and
TMP101 devices remember the Pointer Register value until that value is changed by the next write operation.
10
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