Abstract: In battery voltage monitoring ICs for measuring voltages of unit cells of an assembled battery, communication with a system control unit is realized in consideration of fail-safe. The system control unit and the battery voltage monitoring ICs are coupled to each other by a communication path using a daisy chain. Each battery voltage monitoring IC has a placement setting pin designating, by a binary code, a unit cell group to which the IC is coupled, in the unit cell groups. When it is detected that the Hamming distance between the code indicative of coupling to a group of the highest potential or a group of the lowest potential and a state actually set in the placement setting pin is 1, some failure such as line disconnection, short-circuit, or the like in the placement setting pins is detected, and the communication path is interrupted.

Abstract: A semiconductor device for battery control is provided with a control circuit capable of controlling turning on/off of a charging transistor provided in a charging path of a battery, a CPU capable of controlling charging of the battery via the control circuit, and a deep discharge detection circuit capable of detecting a deeply discharged state of the battery. The semiconductor device is also provided with a switch circuit which, when a deeply discharged state of the battery is detected by the deep discharge detection circuit, preferentially sends the detection result to the control circuit and, thereby, forcibly turns off the charging transistor regardless of charging control by the CPU. When a deeply discharged state of the battery is detected, the charging path of the battery is shut off to prohibit subsequent charging regardless of charging control by the CPU.

Abstract: In a battery monitoring system included in a secondary battery, high-accuracy charge control is enabled at low cost. A semiconductor device includes: a drive unit which drives a transistor for controlling the charge current of a secondary battery and which is configured to be capable of selecting one of plural different voltages as a drive voltage (VGC) for turning on the transistor; and a data processing control unit which performs program processing. The data processing control unit generates condition information including information about the battery level of the secondary battery based on measured values of the secondary battery voltage and current and adjusts the charge current of the secondary battery by changing the drive voltage selection.

Abstract: In a battery monitoring system included in a secondary battery, high-accuracy charge control is enabled at low cost. A semiconductor device includes: a drive unit which drives a transistor for controlling the charge current of a secondary battery and which is configured to be capable of selecting one of plural different voltages as a drive voltage (VGC) for turning on the transistor; and a data processing control unit which performs program processing. The data processing control unit generates condition information including information about the battery level of the secondary battery based on measured values of the secondary battery voltage and current and adjusts the charge current of the secondary battery by changing the drive voltage selection.

Abstract: In battery voltage monitoring ICs for measuring voltages of unit cells of an assembled battery, communication with a system control unit is realized in consideration of fail-safe. The system control unit and the battery voltage monitoring ICs are coupled to each other by a communication path using a daisy chain. Each battery voltage monitoring IC has a placement setting pin designating, by a binary code, a unit cell group to which the IC is coupled, in the unit cell groups. When it is detected that the Hamming distance between the code indicative of coupling to a group of the highest potential or a group of the lowest potential and a state actually set in the placement setting pin is 1, some failure such as line disconnection, short-circuit, or the like in the placement setting pins is detected, and the communication path is interrupted.

Abstract: A semiconductor device for battery control includes a CPU, a first bus coupled to the CPU, a second bus not coupled to the CPU, and a protective function circuit for protecting a battery from stress applied thereto. The semiconductor device also includes a non-volatile memory storing trimming data, a trimming circuit to perform trimming required to allow the protective function circuit to exert a protective function, and a bus control circuit capable of selectively coupling the first bus and the second bus to the non-volatile memory. The semiconductor device further includes a transfer logic circuit which causes, by making the bus control circuit select the second bus, a trimming data transfer path leading from the non-volatile memory to the trimming circuit to be formed and the trimming data stored in the non-volatile memory to be transferred to the trimming circuit without involving the CPU.

Abstract: A semiconductor device for battery control includes a CPU, a first bus coupled to the CPU, a second bus not coupled to the CPU, and a protective function circuit for protecting a battery from stress applied thereto. The semiconductor device also includes a non-volatile memory storing trimming data, a trimming circuit to perform trimming required to allow the protective function circuit to exert a protective function, and a bus control circuit capable of selectively coupling the first bus and the second bus to the non-volatile memory. The semiconductor device further includes a transfer logic circuit which causes, by making the bus control circuit select the second bus, a trimming data transfer path leading from the non-volatile memory to the trimming circuit to be formed and the trimming data stored in the non-volatile memory to be transferred to the trimming circuit without involving the CPU.

Abstract: In a battery monitoring system included in a secondary battery, high-accuracy charge control is enabled at low cost. A semiconductor device includes: a drive unit which drives a transistor for controlling the charge current of a secondary battery and which is configured to be capable of selecting one of plural different voltages as a drive voltage (VGC) for turning on the transistor; and a data processing control unit which performs program processing. The data processing control unit generates condition information including information about the battery level of the secondary battery based on measured values of the secondary battery voltage and current and adjusts the charge current of the secondary battery by changing the drive voltage selection.

Abstract: A semiconductor device for battery control is provided with a control circuit capable of controlling turning on/off of a charging transistor provided in a charging path of a battery, a CPU capable of controlling charging of the battery via the control circuit, and a deep discharge detection circuit capable of detecting a deeply discharged state of the battery. The semiconductor device is also provided with a switch circuit which, when a deeply discharged state of the battery is detected by the deep discharge detection circuit, preferentially sends the detection result to the control circuit and, thereby, forcibly turns off the charging transistor regardless of charging control by the CPU. When a deeply discharged state of the battery is detected, the charging path of the battery is shut off to prohibit subsequent charging regardless of charging control by the CPU.

Abstract: A semiconductor device for battery control includes a CPU, a first bus coupled to the CPU, a second bus not coupled to the CPU, and a protective function circuit for protecting a battery from stress applied thereto. The semiconductor device also includes a non-volatile memory storing trimming data, a trimming circuit to perform trimming required to allow the protective function circuit to exert a protective function, and a bus control circuit capable of selectively coupling the first bus and the second bus to the non-volatile memory. The semiconductor device further includes a transfer logic circuit which causes, by making the bus control circuit select the second bus, a trimming data transfer path leading from the non-volatile memory to the trimming circuit to be formed and the trimming data stored in the non-volatile memory to be transferred to the trimming circuit without involving the CPU.