This is my slave device's circuit,which has DS28E18, ADS1115 and the PTC. I want to read lots of slave devices，but the voltage from ADS1115 is lower than only one slave device working‘s. Sometimes even can't read the data of Slavce devices. I have tried to add the Pull-up resistor with any resistance,but it’s of no avail.So I want to know any other problem will be ameliorate this situation.
Sincerely hope your help!!Thanks!!!
Why does your schematic show different devices than your block diagram?
Thanks for you reply.The 1-Wire device of the block diagram is equal with my schematic,and the Master is just a MCU and DS2485 chip.
You need to post a complete schematic, one that is annotated and shows the processor and what pins are involved. Also it needs to show all power sources and note any wires over 10"/25cm. Be sure to show all hardware devices.
Show the origin of the voltage "3V3_Slave".
Please show the complete schematic.
Why do you have the DS2485 and the DS28E18?
You could try adding a pull-up resistor on the DS2485 IO pin
Schematic Prints.pdf (66,3 KB)
I will take a SWAG (Scientific Wild Assumed Guess) If you break it down to simple terms you are driving your loads with a resistor. The greater the load (or the more you add) the greater the current draw the lower the voltage will be. It appears what you are seeing is what I would expect. There is not enough information to answer you properly.
I also try lots of different value pull-up resistors,but it can't improve the voltage of Sense_VDD of DS28E18.
And is this your own Schematic ?