We present an ultra-low power high dynamic range image sensor dedicated to autonomous vision systems, realized in a back illuminated 65 nm/40 nm stacked process. Based on a time to digital pixel with in-pixel A/D conversion and data memory, it offers a logarithmic data representation on 10-bit, achieves a sensitivity of 6.4 V/1ux/s, an FPN of 0.6 % and a temporal noise of 11 e-, with a pixel pitch of 6.3 $\mu$m.