Patent ID: 11909236
Assignee: MAKITA CORPORATION
Field: nan (nan)
Classification: CPC nan | IPC B  H

Claim 0:
1. A hand-held electric power tool configured to be powered by at least a first battery pack and a second battery pack connected in series, wherein each of the first and second battery packs comprises a microprocessor and memory, the electric power tool comprising:
a tool housing configured to be detachably latched to the first and second battery packs;
a circuit disposed within the tool housing and electrically connecting power terminals of the first and second battery packs in series;
a controller disposed within the tool housing and comprising a tool microprocessor configured to receive signals respectively outputted from the microprocessors of the first and second battery packs, wherein the microprocessor of the first battery pack outputs a first signal in a first voltage range, the microprocessor of the second battery pack outputs a second signal in a second voltage range different from the first voltage range and the tool microprocessor outputs a third signal in the second voltage range;
a first signal communication path disposed within the tool housing and configured to communicate the first signal from the microprocessor of the first battery pack to the tool microprocessor, the first signal communication path being configured to shift a voltage level of the first signal in the first voltage range to a voltage level that is in the second voltage range suitable for inputting into the tool microprocessor;
a second signal communication path disposed within the tool housing and configured to communicate the third signal from the tool microprocessor to the microprocessor of the first battery pack, the second communication path being configured to shift a voltage level of the third signal in the second voltage range to a voltage level that is in the first voltage range suitable for inputting into the microprocessor of the first battery pack, and
a third signal communication path disposed within the tool housing and configured to communicate the second signal in the second voltage range from the microprocessor of the second battery pack to the tool microprocessor.