What IC is this?

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i have seeed studio volt meter, 0-30v. i'm trying dim rest of circuit, can't find information on multiplexer? use in circuit. has no markings besides dot beside i'm assuming pin 1. has figured out they're using here? need desolder enable output pin (if has one) , connect board. thanks!



you more usefully have posted this link.

i guess mcu of sort. maybe chinese knock-off of avr or pic 16-pin mcu.

three ways dim can think of:

1. updating firmware on mcu. protect ip, have locked chip program code can't copied, , may not possible update in-circuit.

2. might able detach display , introduce circuit between mcu , display dim using pwm.

3. give idea , build own dimmable voltmeter scratch! seriously. easer 1 or 2. attiny85 , max7219, example.



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