Patent ID: 7741694

Claim:
A semiconductor integrated circuit device comprising: a semiconductor layer with a plurality of island regions including at least an island region incorporating a driver device for driving a motor, an island region incorporating a control device for controlling the driver device, and a surrounding island region that surrounds the island region incorporating the control device, wherein the semiconductor layer further includes dividing regions dividing the semiconductor layer into the plurality of island regions, including a first dividing region between the island region incorporating the driver device and the surrounding island region and a second dividing region between the surrounding island region and the island region incorporating the control device, wherein the island region incorporating the control device has a first first-conductivity-type embedded diffusion region having supply potential, the first first-conductivity-type embedded diffusion region disposed so as to separate an opposite-conductivity-type semiconductor substrate of the semiconductor layer from a region where the control device is formed, and wherein the surrounding island region has a first-conductivity-type diffusion region having supply potential, and the semiconductor layer within the surrounding island region is disposed around the first-conductivity-type diffusion region and between the first-conductivity-type diffusion region and the second dividing region.