The temperature sampling circuit is not well understood, what is the role of the upper part of the circuit (the transistor), Pti+, PT1- is the sensor interface, VPT1+, VPT1- is connected to the CD4052 input.
Abner 发表于 June 30, 2020
The transistor should be a constant current circuit, and the sensor measurement should be based on the bridge principle.
Kenan 发表于 June 30, 2020
The input port part can be used as a temperature measurement sensor interface by the bridge mode, which is more beneficial to the measurement result.
