Viltrox EF-NEX IV adapter teardown

J2 connector ( towards camera side) :

pin 1 (lens_gnd) and 3 (logic_gnd) are connected

Under Linux, it is recognised as USB mass storage

PCB version: EF-NEXIV_V2.3

date code: 20201223

U3: The MCU is a STM32F103T8U6 , cost ~USD 2

U1: W25Q?? serial flash ?

There are 4 through holes labelled as G D C V, which is deduced to be ST-Link port

G: gnd. connect to pin 1 of J2

V: Vcc. connect to pin 5 of J2

D: SIO, serial data. TBD

C: CLK, serial clock. TBD

Estimate BOM cost is USD 10 or less

Viltrox EF-NEX II

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