Monolithic CMOS sensors represent a potential alternative to hybrid pixel detectors for the future of high energy physics experiments.
Over the last few years, the TowerJazz 180nm CMOS process has been under investigation as a candidate for pixel detectors at the High Luminosity Large Hadron Collider (HL-LHC).
First tests on prototype chips have shown that this technology can qualify for the design of the outer pixel layers of the ATLAS Inner Tracker (ITk).
In particular, there are more and more convincing indications that radiation tolerance at the required levels can be achieved.
These results have triggered the development of novel high-speed readout architectures, which are optimized for the high particle density expected at pp-collisions at HL-LHC.
In this talk, the status of these studies is presented, as well as current and future activities.