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The KM2A(one kilometer square extensive air shower array) is the largestdetector array in the LHAA- SO(Large High Altitude Air Shower Observatory)project. The KM2A consists of 5635 EDs(Electromagnetic particle Detectors) and1221 MDs(Muon Detectors). The EDs are distributed and exposed in the wild. Twochannels, Anode and Dynode, are employed for the PMT(photomultiplier tube)signal readout. The readout electronics proposed in this paper aims at theaccurate charge and arrival time measurement of the PMT signals, which cover alarge amplitude range from 20P.E(photoelectrons) to 2x10^5 P.E. By using theTrigger-less architecture, we digitize signals close to the PMTs. All digitizeddata is transmitted to DAQ(Data Acquisition) via the simplified WR(WhiteRabbit) protocol. Compared with traditional high energy experiments,high-precision of time measurement in such a large area and suppression oftemperature effects in the wild become the key techniques. Experiments showthat the design has fulfilled the requirements in this project.

Prototype of Readout Electronics for the ED in LHAASO KM2A