Semiconductor integrated circuit device

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 disposed so as to surround the island region incorporating the driver 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 driver 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 driver 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 first dividing region.