Electronic system for a drug delivery device and drug delivery device

A drug delivery device comprising:

• a reservoir retainer for retaining a reservoir with a drug in the drug delivery device;
• and
• an electronic system comprising:
• a dose setting and drive mechanism configured to perform a dose setting operation for setting a dose to be delivered by the drug delivery device and a dose delivery operation for delivering the set dose,
• wherein the dose setting and drive mechanism comprises a first member and a second member, wherein in the dose delivery operation and/or in the dose setting operation, the first member moves relative to the second member;
• an electronic control unit configured to control an operation of the electronic system;
• and
• an electrical use detection unit operatively connected to the electronic control unit, the electrical use detection unit being configured to generate a use signal in response to a relative movement between the first member and the second member, the use signal indicating that a user has commenced the dose setting operation or the dose delivery operation,
• wherein the electronic system has a first state and a second state, and is configured to be switched from the first state into the second state by the electronic control unit in response to the use signal, wherein the electronic system consumes more electrical power in the second state as compared to the first state, and
• wherein the second member is directly engaged with a piston rod to drive the dose delivery operation.

An electronic system for a drug delivery device, the electronic system comprising:

• a dose setting and drive mechanism configured to perform a dose setting operation for setting a dose to be delivered by the drug delivery device and a dose delivery operation for delivering the set dose,
• wherein the dose setting and drive mechanism comprises a first member and a second member, wherein in the dose delivery operation and/or in the dose setting operation, the first member rotates relative to the second member;
• an electronic control unit configured to control an operation of the electronic system;
• and
• an electrical use detection unit operatively connected to the electronic control unit, the electrical use detection unit being configured to generate a use signal in response to a relative movement between the first member and the second member, the use signal indicating that a user has commenced the dose delivery operation,
• wherein the electronic system has a first state and a second state, and is configured to be switched from the first state into the second state by the electronic control unit in response to the use signal, and
• wherein the second member is directly engaged with a piston rod to drive the dose delivery operation.