Omnivision put much more Truefocus info on its site. It comes out that Truefocus is 2-chip solution, having a companion ISP OV630.
The ISP has a non-standard 1.3V supply for its core logic, meaning it uses either overdriven 0.13um process, or some low-voltage flavour of 0.15um. It supports up to 3MP resolution, which explains why 5MP module uses a more conventional AF. The power consumption is 200mA in active mode.
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