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TMP1075

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SBOS854 – MARCH 2018

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Copyright © 2018, Texas Instruments Incorporated

The TMP1075 features three address pins to allow up to 32 devices to be addressed on a single bus interface.

describes the pin logic levels used to properly connect up to 32 devices. The state of pins A0, A1, and A2 is

sampled on every bus communication and must be set prior to any activity on the interface.

Table 2. Address Pins and Slave Addresses for the TMP1075

A2

A1

A0

ADDRESS, HEX

0

0

SDA

80

0

0

SCL

82

0

1

SDA

84

0

1

SCL

86

1

0

SDA

88

1

0

SCL

8A

1

1

SDA

8C

1

1

SCL

8E

0

0

0

90

0

0

1

92

0

1

0

94

0

1

1

96

1

0

0

98

1

0

1

9A

1

1

0

9C

1

1

1

9E

0

SDA

SDA

A0

0

SDA

SCL

A2

0

SCL

SDA

A4

0

SCL

SCL

A6

1

SDA

SDA

A8

1

SDA

SCL

AA

1

SCL

SDA

AC

1

SCL

SCL

AE

0

SDA

0

B0

0

SDA

1

B2

0

SCL

0

B4

0

SCL

1

B6

1

SDA

0

B8

1

SDA

1

BA

1

SCL

0

BC

1

SCL

1

BE

7.3.2.3 Writing and Reading to the TMP1075

Accessing a particular register on the TMP1075 device is accomplished by writing the appropriate value to the

Pointer register. The value for the Pointer register is the first byte transferred after the slave address byte with

the R/W bit low. Every write operation to the TMP1075 requires a value for the Pointer register (see Figure 2).

When reading from the TMP1075 device, 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 a 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 slave address byte with the R/W bit high to initiate the read command.

See Figure 4 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 TMP1075 remember the Pointer register value until

the value is changed by the next write operation.