Device for measuring current by means of integration, said device comprising: - a first operational amplifier OP1 comprising a first inverting input, with the current to be measured being applied on said first inverting input; - an integration capacitor arranged between the first inverting input of the first operational amplifier OP1 and the output of this first operational amplifier; - an active current source connected to the first inverting input of the first operational amplifier OP1, with this current source being configured to: ∘ in a first measurement state of the device, compensate for leakage current of the device; ∘ in a second reset state of the device, generate a current which can return the charge of the integration capacitor to its initial value Qo; said device being characterized in that the second reset state is triggered by a charge value of the integration capacitor substantially equal to a maximum value Q Max that it can have, said device comprising: - means for controlling configured to: ∘ memorise a Qo initial charge state of the integration capacitor, corresponding to a voltage Vco at the output of the first operational amplifier; ∘ place the device in the measurement state and keep it there until the charge of the integration capacitor substantially reaches Q Max, corresponding to a voltage V CMax at the output of the first operational amplifier; - when the charge of the integration capacitor substantially reaches Q Max, corresponding to a voltage V CMax at the output of the first operational amplifier, place the device in the reset state until the charge of the integration capacitor substantially reaches Qo. - a first operational amplifier OP1 comprising a first inverting input, with the current to be measured being applied on said first inverting input; - an integration capacitor arranged between the first inverting input of the first operational amplifier OP1 and the output of this first operational amplifier; - an active current source connected to the first inverting input of the first operational amplifier OP1, with this current source being configured to: ∘ in a first measurement state of the device, compensate for leakage current of the device; ∘ in a second reset state of the device, generate a current which can return the charge of the integration capacitor to its initial value Qo; said device being characterized in that the second reset state is triggered by a charge value of the integration capacitor substantially equal to a maximum value Q Max that it can have, said device comprising: ∘ in a first measurement state of the device, compensate for leakage current of the device; ∘ in a second reset state of the device, generate a current which can return the charge of the integration capacitor to its initial value Qo; - means for controlling configured to: ∘ memorise a Qo initial charge state of the integration capacitor, corresponding to a voltage Vco at the output of the first operational amplifier; ∘ place the device in the measurement state and keep it there until the charge of the integration capacitor substantially reaches Q Max, corresponding to a voltage V CMax at the output of the first operational amplifier; ∘ memorise a Qo initial charge state of the integration capacitor, corresponding to a voltage Vco at the output of the first operational amplifier; ∘ place the device in the measurement state and keep it there until the charge of the integration capacitor substantially reaches Q Max, corresponding to a voltage V CMax at the output of the first operational amplifier; - when the charge of the integration capacitor substantially reaches Q Max, corresponding to a voltage V CMax at the output of the first operational amplifier, place the device in the reset state until the charge of the integration capacitor substantially reaches Qo.