7.5.3 Device Address

To communicate with the TMP114, the controller must first address target devices through an address byte. The

address byte has seven address bits and a read-write (R/W) bit that indicates the intent of executing a read or

write operation. Table 7-2 shows the TMP114 available in multiple versions, each with a different target address.

Table 7-2. Device Target Address

Product

Device Accuracy

Device Two-Wire Address

TMP114A

0.3 °C

1001000

TMP114B

0.3 °C

1001001

TMP114NC

1 °C

1001101

TMP114NB

1 °C

1001110

TMP114NA

1 °C

1001111

7.5.4 Bus Transactions

Data must be sent to and received from the target devices, and this is accomplished by reading from or writing to

registers in the target device.

Registers are locations in the memory of the target which contain information, whether it be the configuration

information or some sampled data to send back to the controller. The controller must write information to these

registers in order to instruct the target device to perform a task.

7.5.4.1 Auto-Increment

The TMP114 supports the use of the auto-increment feature. In the control register byte of the I2C transaction,

bit 7 is used as the auto-increment bit. If the bit is set to 0b during a transaction, continuous reads or writes will

only read and write to the register specified in the pointer register byte. If Auto-increment is set to 1b, continuous

reads and writes will increment the address pointer by 1 after every word of data has been read or written to

the TMP114. This allows the controller to read or write to multiple registers with a single transaction for faster

communication.

Figure 7-9 shows the structure of the Control Register.

0

0

0

P3

P2

P1

P0

A

0

Register Pointer (N)

ACK from Target

Must be 0h

Auto-Increment

Target controls SDA line

Controller controls SDA line

Figure 7-9. Control Register

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TMP114

SNIS214 – JUNE 2021

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