The High-Energy Particle Detector (HEPD-02) is a particle spectrometer developed by the Italian collaboration Limadou within the CSES-02 mission. It has been designed for the detection of electrons (3-100 MeV), protons (30-200 MeV), and light nuclei, in the near Earth orbit. HEPD-02 is the first detector to use a pixel silicon tracker in space. In particular, the Monolithic Active Pixel Sensors (MAPS) constituting the HEPD-02 silicon tracker are characterized by excellent spatial resolution, lower production costs, higher robustness, and lower noise when compared to traditional microstrip sensors. Nevertheless, stringent requirements on power consumption for space applications lead to a challenging optimization of power demanding processes. Within this paradigm, a tailored Tracker Data AcQuisition (TDAQ) system has been designed. The TDAQ firmware was developed on a Field Programmable Gate Array (FPGA) manufactured by Xilinx: a low-power version of the Artix family with a suitable amount of resources. The parallelization implemented within the TDAQ algorithm was a crucial point in optimizing the limited read-out speed, imposed by power constraints. Nonetheless, the strengths of the TDAQ firmware consists in its modularity and redundancy. In this work, we will present the characterization and the performance of the HEPD-02 TDAQ system.