  This work presents the development of an Intelligent Platform Management
Controller mezzanine in a Mini DIMM form factor for use in electronic boards
compliant to the PICMG Advanced Telecommunication Computing Architecture (ATCA)
standard. The module is based on an STMicroelectronics STM32H745
microcontroller running the OpenIPMC open-source software. The mezzanine has
been successfully tested on a variety of ATCA boards being proposed for the
upgrade of the experiments at the HL-LHC, with its design and firmware being
distributed under open-source hardware license.
