Test mode controller circuit controlling test functions for charge and discharge controller circuit

A charge and discharge controller circuit for controlling discharge from a secondary battery to a load or charge from a charger to the secondary battery, the charge and discharge controller circuit comprising:

• a test mode controller circuit,
• wherein the test mode controller circuit comprises:
• a first test mode detector circuit detecting a first test mode based on a terminal voltage of a first terminal, and outputting a first test mode detection signal;
• a second test mode detector circuit detecting a second test mode based on a terminal voltage of a second terminal in response to the first test mode detection signal, and outputting a second test mode detection signal;
• a test mode latch circuit outputting a test mode latch signal having a predetermined value in response to the second test mode detection signal;
• and
• a controller configured to set a predetermined test function corresponding to a value of the test mode latch circuit based on the test mode latch signal,
• wherein the controller is configured to set a test function of the charge and discharge controller circuit.

A battery apparatus comprising:

• a secondary battery;
• a charge and discharge controller circuit configured to discharge from a secondary battery to a load or change from a charger to the secondary battery,
• wherein the charge and discharge controller circuit comprises:
• a test mode controller circuit,
• wherein the test mode controller circuit comprises:
• a first test mode detector circuit detecting a first test mode based on a terminal voltage of a first terminal, and outputting a first test mode detection signal;
• a second test mode detector circuit detecting a second test mode based on a terminal voltage of a second terminal in response to the first test mode detection signal, and outputting a second test mode detection signal;
• a test mode latch circuit outputting a test mode latch signal having a predetermined value in response to the second test mode detection signal;
• and
• a controller configured to set a predetermined test function corresponding to a value of the test mode latch circuit based on the test mode latch signal,
• wherein the controller is configured to set a test function of the charge and discharge controller circuit,
• wherein the battery apparatus further comprises:
• a charge control switch element that controls the charge based on a charge control signal from the charge and discharge controller circuit;
• and
• a discharge control switch element that controls the discharge based on a discharge control signal from the charge and discharge controller circuit.

A test mode control method comprising the steps of:

• detecting, by a first test mode detector circuit, a first test mode based on a terminal voltage of a first terminal, and outputting a first test mode detection signal;
• detecting, by a second test mode detector circuit, a second test mode based on a terminal voltage of a second terminal in response to the first test mode detection signal, and outputting a second test mode detection signal;
• outputting, by a test mode latch circuit, a test mode latch signal having a predetermined value in response to the second test mode detection signal;
• and
• setting, by a controller, a predetermined test function corresponding to a value of the test mode latch circuit based on the test mode latch signal.