JAJSOO3A October 2014 – June 2022 TMP75B-Q1
PRODUCTION DATA
The TMP75B-Q1 supports the SMBus alert function. When the TMP75B-Q1 operates in interrupt mode (TM = 1), the ALERT pin may be connected as an SMBus alert signal. When a controller senses that an alert condition is present on the ALERT line, the controller sends an SMBus alert command (00011001) to the bus. If the ALERT pin is active, the device acknowledges the SMBus alert command and responds by returning its target address on the SDA line. The eighth bit (LSB) of the target address byte indicates whether the alert condition is caused by the temperature exceeding THIGH or falling below TLOW. The LSB is high if the temperature is greater than THIGH, or low if the temperature is less than TLOW. See Figure 7-5 for details of this sequence.
If multiple devices on the bus respond to the SMBus alert command, arbitration during the target address portion of the SMBus alert command determines which device clears its alert status first. If the TMP75B-Q1 wins the arbitration, its ALERT pin becomes inactive at the completion of the SMBus alert command. If the TMP75B-Q1 loses the arbitration, its ALERT pin remains active.