Control device and method for controlling element substrate
AssigneeCanon Kabushiki Kaisha
InventorsHironori Naka, Kazuki Hirobe
Life of this patent
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Abstract
An element substrate is provided with a fuse memory configured to store information in response to having a voltage applied thereto, a first switch configured to switch whether or not to energize the fuse memory, a resistance element, a second switch configured to switch whether or not to energize the resistance element, a first node connected to the fuse memory and the resistance element, and a second node configured to supply power to the first node from outside. Regarding the element substrate, electric charge that remains at the first node is discharged by allowing, before allowing the first switch to energize the fuse memory, the second switch to energize the resistance element from the first node.
Claims8
A control device comprising:
- an element substrate provided with a fuse memory configured to store information in response to having a voltage applied thereto, a first switch configured to switch whether or not to energize the fuse memory, a first node connected to the fuse memory through the first switch and to a comparator through a third switch, and a second node configured to supply power to the first node from outside;
- a resistance element disposed on the element substrate between a second switch and a ground potential, the second switch connecting the resistance element to the first node;
- and
- a controller configured to switch the first switch to store information into the fuse memory, and to read out information from the fuse memory, and to switch the second switch to connect the first node to the ground potential through the resistance element,
- wherein, before allowing the first switch to energize the fuse memory, the controller causes electric charge that remains at the first node to be discharged by switching the second switch.
A method for controlling an element substrate provided with a fuse memory configured to store information in response to having a voltage applied thereto, a first switch configured to switch whether or not to energize the fuse memory, a first node connected to the fuse memory through the first switch and to a comparator through a third switch, and a second node configured to supply power to the first node from outside, and a resistance element disposed on the element substrate between a second switch and a ground potential, the second switch connecting the resistance element to the first node, the method comprising:
- discharging, before allowing the first switch to energize the fuse memory, electric charge that remains at the first node by switching the second switch to connect the first node to the ground potential through the resistance element.
Dependencies are inferred from the claim text.