I've been trying to reverse-engineer this circuit but I'm an ME, so my knowledge of electronics is limited to pretty much Arduinos.
I have a simple circuit and I'm trying to identify one of the components.
The component is a small IC, DFN-6 (3x3) package size, and is wired as shown in the drawn schematic. The part number that I can make out I think is 26T6 TIW 957M.
The circuit is on a lithium BMS board and is used for the initial handshake when connecting a tool to the battery.
The circuit is separate from the rest of the BMS as I've isolated the components.
With the circuit isolated, applying a 1 kHz positive square wave produces the signal shown in the below oscilloscope screen capture.
What I've concluded is that it's some sort of fixed/pre-programmed oscillator, but the input is the same as the output...?
(Click on an image for a larger version)
Figure 1: Traced schematic
Figure 2: Oscilloscope capture
Figure 3: Top marking on unknown device
Figure 4: PCB showing unknown device