Veketti
Full Member level 3
Dear All,
I used STM1061 IC with voltage treshold 3.1V with below shown circuitry to detect low voltage. I needed it to trigger when voltage was ~5.3V. This IC was only available up to 3.1V so I had to decide some circuitry to lower the voltage. One was using voltage divider, but as this is constantly powered by battery I didn't want to waste any energy so I decided to use diodes in series to drop the voltage. Datasheet for these 1N4148 say only, max forward voltage being 1V. Measured by multimeter and I got 0.56V voltage drop, so calculated I need 4 to drop enough voltage for the 3.1V IC to trigger. I only had SMD diodes and didn't bother to solder them in series to test complete circuit and now that I got the PCB's each only drop around 0.36V! So this only works when the voltage drop down to around 4.6V which is way too low.
So my question is, is there anything to do to save this design and pcb to make it work? Eg. replace any other type 1206 SMD diode or anything?
Thank you in advance.
I used STM1061 IC with voltage treshold 3.1V with below shown circuitry to detect low voltage. I needed it to trigger when voltage was ~5.3V. This IC was only available up to 3.1V so I had to decide some circuitry to lower the voltage. One was using voltage divider, but as this is constantly powered by battery I didn't want to waste any energy so I decided to use diodes in series to drop the voltage. Datasheet for these 1N4148 say only, max forward voltage being 1V. Measured by multimeter and I got 0.56V voltage drop, so calculated I need 4 to drop enough voltage for the 3.1V IC to trigger. I only had SMD diodes and didn't bother to solder them in series to test complete circuit and now that I got the PCB's each only drop around 0.36V! So this only works when the voltage drop down to around 4.6V which is way too low.
So my question is, is there anything to do to save this design and pcb to make it work? Eg. replace any other type 1206 SMD diode or anything?
Thank you in advance.