  \textit{Topmetal-${II}^-$} is a highly pixelated direct charge sensor that
contains a 72${\times}$72 pixel array of 83${\mu}$m pitch size. The key feature
of \textit{Topmetal-${II}^-$} is that it can directly collect charges via metal
nodes of each pixel to form two-dimensional images of charge cloud
distributions. \textit{Topmetal-${II}^-$} was proved to measure charged
particles without amplification at room temperature. To measure its performance
at cryogenic temperature, a \textit{Topmetal-${II}^-$} sensor is embedded into
a liquid nitrogen dewar. The results presented in this paper show that
\textit{Topmetal-${II}^-$} can also operate well at this low temperature with a
noise (ENC) of 12 e$^-$ lower than that at room temperature (13 e$^-$). From
the noise perspective, \textit{Topmetal-${II}^-$} is a promising candidate for
the next generation readout of liquid argon and xenon Time Projection Chamber
(TPC) used in experiments searching for neutrinoless double beta decay and dark
matter.
