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We have been developing monolithic active pixel sensors, named ``XRPIX'',based on the silicon-on-insulator (SOI) pixel technology for future X-rayastronomy satellites. XRPIX has the function of event trigger and hit addressoutputs. This function allows us to read out analog signals only of hit pixelson trigger timing, which is referred to as the event-driven readout mode.Recently, we processed ``XRPIX5b'' with the largest imaging area of 21.9~mm$\times$ 13.8~mm in the XRPIX series. X-ray spectra are successfully obtainedfrom all the pixels, and the readout noise is 46~e$^-$~(rms) in the framereadout mode. The gain variation was measured to be 1.2\%~(FWHM) among thepixels. We successfully obtain the X-ray image in the event-driven readoutmode.

Evaluation of Kyoto's Event-Driven X-ray Astronomical SOI Pixel Sensor with a Large Imaging Area