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We present ECLAIRs, the Gamma-ray burst (GRB) trigger camera to fly on-boardthe Chinese-French mission SVOM. ECLAIRs is a wide-field ($\sim 2$\,sr) codedmask camera with a mask transparency of 40\% and a 1024 $\mathrm{cm}^2$detection plane coupled to a data processing unit, so-called UGTS, which is incharge of locating GRBs in near real time thanks to image and rate triggers. Wepresent the instrument science requirements and how the design of ECLAIRs hasbeen optimized to increase its sensitivity to high-redshift GRBs andlow-luminosity GRBs in the local Universe, by having a low-energy threshold of4 keV. The total spectral coverage ranges from 4 to 150 keV. ECLAIRs isexpected to detect $\sim 200$ GRBs of all types during the nominal 3 yearmission lifetime.  To reach a 4 keV low-energy threshold, the ECLAIRs detection plane is pavedwith 6400 $4\times 4~\mathrm{mm}^2$ and 1 mm-thick Schottky CdTe detectors. Thedetectors are grouped by 32, in 8x4 matrices read by a low-noise ASIC, formingelementary modules called XRDPIX. In this paper, we also present our currentefforts to investigate the performance of these modules with their front-endelectronics when illuminated by charged particles and/or photons usingradioactive sources. All measurements are made in different instrumentconfigurations in vacuum and with a nominal in-flight detector temperature of$-20^\circ$C. This work will enable us to choose the in-flight configurationthat will make the best compromise between the science performance and thein-flight operability of ECLAIRs. We will show some highlights of this work.

The X-/Gamma-ray camera ECLAIRs for the Gammay-ray burst mission SVOM