ZHCSSV5 January 2024 TMP119
PRODUCTION DATA
The user can write a register address to the pointer register to access a particular register on the TMP119. The value for the pointer register is the first byte transferred after the target address byte with the R/ W bit low. Every write operation to the TMP119 requires a value for the pointer register.
When reading from the TMP119, the last value stored in the pointer register by a write operation is used to determine which register is read during a read operation. To change the register pointer for a read operation, a new value must be written to the pointer register. The user can issue an address byte with the R/ W bit low, followed by the pointer register byte to write a new value for the pointer register. No additional data is required. The controller can then generate a START condition and send the target address byte with the R/ W bit high to initiate the read command. See Figure 7-11 for details of this sequence. If repeated reads from the same register are desired, it is not necessary to send the pointer register bytes continuously because the TMP119 retains the pointer register value until the value is changed by the next write operation.
Register bytes are sent with the most significant byte first, followed by the least significant byte.