  A Forward Calorimeter (FoCal) has been proposed as part of the ALICE upgrades
for data taking from 2029 onwards. The FoCal will feature a sampling
electromagnetic calorimeter segmented into 110 towers supplemented by a hadron
calorimeter. The electromagnetic calorimeter will be composed of 20 passive
layers of tungsten absorber interleaved with 18 active layers of
low-granularity silicon pad sensors and two layers of high-granularity pixel
detectors. Each pad layer will be read out by 110 silicon pad sensors of 72
channels, amounting to a total of 1980 sensors. This paper describes, from
front-end to back-end, the electronics developed to instrument a tower
prototype composed of 18 silicon pad sensors as well as a design proposal for
the full-detector readout system.
