Abstract: Provided are a semiconductor device, a battery system, and a battery control method that are capable of reducing difference in remaining capacity without regard to the load status of a battery pack. The semiconductor device includes a high-voltage resistant circuit and a low-voltage circuit. The high-voltage resistant circuit includes a multiplexer that selects one of multiple series-coupled battery cells in a battery pack and couples the selected battery cell to the battery pack. The low-voltage circuit includes a measurement circuit that individually measures voltages of the battery cells. The multiplexer couples one of the battery cells to a power supply for the low-voltage circuit.

Abstract: Provided are a semiconductor device, a battery system, and a battery control method that are capable of reducing difference in remaining capacity without regard to the load status of a battery pack. The semiconductor device includes a high-voltage resistant circuit and a low-voltage circuit. The high-voltage resistant circuit includes a multiplexer that selects one of multiple series-coupled battery cells in a battery pack and couples the selected battery cell to the battery pack. The low-voltage circuit includes a measurement circuit that individually measures voltages of the battery cells. The multiplexer couples one of the battery cells to a power supply for the low-voltage circuit.

Abstract: A gain control circuit includes a comparator that compares an input gain value with a count value to generate a comparison result signal, a counter that counts up or counts down the count value in accordance with the comparison result signal, and a gain modulator circuit that modulates the count value to generate a gain control signal which changes in a time-divided manner. The gain modulator circuit modulates the count value so that a gain obtained by time-averaging a gain corresponding to the gain control signal matches a gain based on the count value.

Abstract: A gain control circuit includes a comparator that compares an input gain value with a count value to generate a comparison result signal, a counter that counts up or counts down the count value in accordance with the comparison result signal, and a gain modulator circuit that modulates the count value to generate a gain control signal which changes in a time-divided manner. The gain modulator circuit modulates the count value so that a gain obtained by time-averaging a gain corresponding to the gain control signal matches a gain based on the count value.

Abstract: An address generator is supplied with a designated gain GT, and generates exponent data n and an address of mantissa A. The address of mantissa A is set based on an accuracy of the designated gain GT. A mantissa-coefficient acquiring unit is so structured as to acquire a mantissa-coefficient k based on an equation acquired in accordance with a relationship between the exponent data n and mantissa data for each address of mantissa A. A coefficient data acquiring section and a mantissa data acquiring section both included in the mantissa-coefficient acquiring unit generate a coefficient a and mantissa data d1, respectively, based on the address of mantissa A, whereby the mantissa-coefficient k can be acquired for the exponent data n with a high accuracy for each address of mantissa A.