Abstract: A sensor device includes: a sensor that detects environment information; a battery that supplies electric power to the sensor device; and a connector that detachably attaches to an auxiliary battery for supplying electric power to the sensor device. The sensor device transmits the detected environment information to another sensor device, and when the auxiliary battery is not attached, the sensor device operates with electric power supply from the battery, and when the auxiliary battery is attached, the sensor device operates with electric power supply from either the battery or the auxiliary battery.

Abstract: A sensor node of the invention includes: a first to nth (n is an integer equal to or greater than two) environmental sensors which are configured to acquire ambient environmental information; a transmitter that is configured to regularly issue ambient environmental information acquired by at least one of the second to nth environmental sensors at a predetermined cycle and is configured to irregularly issue ambient environmental information acquired by the first environmental sensor and ambient environmental information acquired by at least one of the second to nth environmental sensors; a detector that is configured to detect a change value of ambient environmental information acquired by the first environmental sensor greater than a first threshold value; and a transmission interval controller that is configured to control a timing at which the transmitter regularly and irregularly issues the ambient environmental information.

Abstract: A sensor node of the invention includes: a first to nth (n is an integer equal to or greater than two) environmental sensors which are configured to acquire ambient environmental information; a transmitter that is configured to regularly issue ambient environmental information acquired by at least one of the second to nth environmental sensors at a predetermined cycle and is configured to irregularly issue ambient environmental information acquired by the first environmental sensor and ambient environmental information acquired by at least one of the second to nth environmental sensors; a detector that is configured to detect a change value of ambient environmental information acquired by the first environmental sensor greater than a first threshold value; and a transmission interval controller that is configured to control a timing at which the transmitter regularly and irregularly issues the ambient environmental information.

Abstract: A semiconductor memory includes a group of memory cells arrayed in a matrix, memory cell electric power source lines configured to connect the respective memory cells arrayed in a direction of rows of the group of memory cells of each of the rows, two electric power source terminals configured to be mutually independent, and switches configured to be connected between the memory cell electric power source lines and the two electric power source terminals respectively, to be controlled to turn ON/OFF by a inversion logic operation based on a test mode switching signal for switching to and from a test mode and a normal operation mode, and to connect the memory cell power source line to either of the two electric power source terminals according to the ON/OFF control.

Abstract: A semiconductor memory includes a group of memory cells arrayed in a matrix, memory cell electric power source lines configured to connect the respective memory cells arrayed in a direction of rows of the group of memory cells of each of the rows, two electric power source terminals configured to be mutually independent, and switches configured to be connected between the memory cell electric power source lines and the two electric power source terminals respectively, to be controlled to turn ON/OFF by a inversion logic operation based on a test mode switching signal for switching to and from a test mode and a normal operation mode, and to connect the memory cell power source line to either of the two electric power source terminals according to the ON/OFF control.