To write on the I²C bus, the controller sends a START condition on the bus with the address of the target, as well as the last bit (the R/W bit) set to 0b, which signifies a write. The target acknowledges, letting the controller know it is ready. After this, the controller starts sending the control register data to the target until the controller has sent all the data necessary, and the controller terminates the transmission with a STOP condition.

Writes to read-only registers or register locations outside of the register map will be ignored. The TMP114 will still ACK when writing outside of the register map.

Figure 8-10 shows an example of writing a single word write communication.

Figure 8-10 Write to Single Register

Multiple writes to the same register are also possible with the TMP114. Figure 8-11 shows how the controller can repeatedly write to the same register when the Auto-Increment bit in the control register is set to 0b.

Figure 8-11 Repeated Write to Single Register

The TMP114 also supports a continuous write to sequential registers. By setting the Auto-Increment bit in the control register to 1b, the TMP114 will increment the address pointer after each word of data is written to the device. This allows the controller to write multiple register values in the same transaction as shown in Figure 8-12. Currently this feature will not allow the controller to properly write to the Configuration register and it is recommended to use single register writes to the Configuration register.

Figure 8-12 Burst Write to Multiple Registers