See the attached schematic (which is made into a PCB) and .asc file. The circuit and PCB perform similarly in many ways, except one: The simulation says that when power is applied to BAT+ (with V1 in the sim), the ENABLE label reaches a steady state of 0V. The PCB has it reach a steady state of 3.8V. On the PCB the ENABLE label actually connecting to a RT9013 and GPIO4 to an ESP8266, but the problem exists even if I physically cut ENABLE and GPIO4 entirely from the RT9013 and ESP8266, so the simulation should be very close to the PCB with no external circuitry influencing it. I have 5 PCBs and they all perform the same, so it's likely it is a design issue and not a PCB production issue.
One interesting thing is the value of R5 (on the sim model), a value of 10K converges in Sim to 0, but a value 20K converges the Sim to 3.8V. In practice the PCB has 10K as its value, but I want to point out the significance of that resistor.
What could be the issue could be here? The circuit has few components, they seem identical to me, how could they be different?
Also how could I model the RT9013 given I don't see a spice model for it from the manufacturer?
One interesting thing is the value of R5 (on the sim model), a value of 10K converges in Sim to 0, but a value 20K converges the Sim to 3.8V. In practice the PCB has 10K as its value, but I want to point out the significance of that resistor.
What could be the issue could be here? The circuit has few components, they seem identical to me, how could they be different?
Also how could I model the RT9013 given I don't see a spice model for it from the manufacturer?
Attachments
-
16.5 KB Views: 46
-
2.7 KB Views: 4
-
537 bytes Views: 2