Original question:
TPS929240-Q1: TPS929240-Q1: Register settings for the TPS929240 part2
Tool/software:
Hello experts,
we plan to use TPS929240 in a new project. We plan to use the temperature sensor inside the chip to achieve thermal derating. We tested it on a PCB containing 8 929240, it is found that the temperature difference is relatively large in the case of no lighting and current. At most, 2 ADC data can be lost. We want to know the accuracy of temperature detection inside the chip and whether there are any good suggestions for us.
Hi lin,
The deviation is +-15 degree for internal temperature detection. If you want to use a more accurate temperature management, please refer to the below description in the 6.3.6.5 Pre-Thermal Warning in NORMAL state, one channel can be used to connect an external PTC or NTC for thermal derating.
BR,
Hailee.
Thank you for your reply. I plan to make the following circuit according to your prompt. As shown in the figure, I use the spare channel to directly detect the voltage value of NTC, and then read it back through tps929240. Here are some questions: how should I configure this channel, my idea is to turn off the OUTEN of this channel, and then just read the ADC of this channel, are there any other precautions?
