The data acquisition system for focal plane detector of EP-FXT

Purpose Design and implement a system within the detector electronic box of the FXT payload on the EP satellite to read out and acquire data from the pnCCD module of the focal plane detector.
Methods The pnCCD module is complex to control, has a high data throughput, and poses challenges during readout. This paper presents the design and implementation of a data acquisition system specifically for pnCCD and its readout ASIC, CAMEX. The DAQ includes a dedicated front-end module for signal conversion, a control module for powering the pnCCD on and off and managing its sequence, and a signal preprocessing module that performs real-time corrections for offset and common mode on signals acquired by the ADC. Additionally, the offset module allows for in-orbit calculation and updating of the offset.
Results The DAQ operates stably in orbit and functions normally, accurately recording the amplitude, position, and arrival time of signals. This capability enables the production of images and energy spectra, which provide robust support for scientific data analysis on the ground.
Conclusion The DAQ has achieved readout and data acquisition for the pnCCD module of the focal plane detector, meeting the requirements of the EP satellite’s FXT payload and operating well in orbit.