SLVSFZ1 December 2020 TPS27SA08-Q1
The SNS output may be used to sense the load current, supply voltage, or device temperature. The SELx pins will select the desired sense signal. The sense circuit will provide a current that is proportional to the selected parameter. This current will be sourced into an external resistor to create a voltage that is proportional to the selected parameter. This voltage may be measured by an ADC or comparator.
To ensure accurate sensing measurement, the sensing resistor should be connected to the same ground potential as the μC ADC.
The SNS Output includes an internal clamp, VSNSclamp. This clamp is designed to prevent a high voltage at the SNS output and the ADC input.
|Load current||ISNSI = IOUT / 4600|
|Supply voltage(1)||ISNSV = (VBB) × dISNSV / dV|
|Device temperature||ISNST = (TJ – 25°C) × dISNST / dT + 0.85|
The SNS output will also be used to indicate system faults. ISNS will go to the predefined level, ISNSFH, when there is a fault. This level is defined in the electrical specifications.