Semiconductor device, battery monitoring system, and diagnostic method for semiconductor device

A semiconductor device for measuring a voltage of a battery cell, comprising:

• a first node configured to receive a first voltage of a first capacitor that accumulates a first electric charge based on the voltage of the battery cell, the first node connected to a first end of the battery cell;
• a second node configured to receive a second voltage based on the voltage of the battery cell, the second node connected to the first end of the battery cell;
• a first diagnostic voltage generating circuit configured to output a first diagnostic voltage;
• a second diagnostic voltage generating circuit configured to output a second diagnostic voltage;
• and
• a battery voltage measurement unit that measures a voltage of the first node for determining the voltage of the battery cell, and measures the first and second diagnostic voltages for performing a first diagnosis relating to an anomaly in the battery voltage measurement unit.

A method for diagnosing an anomaly in a semiconductor device, the semiconductor device monitoring a voltage of a battery cell, the method comprising:

• providing a first node that receives a first voltage, the first voltage being a voltage of a capacitor that accumulates an electric charge based on the voltage of the battery cell, the first node connected to a first end of the battery cell;
• measuring, through a first path, a voltage of the first node using a first battery voltage measurement unit;
• providing a second node that receives a second voltage based on the voltage of the battery cell, the second node being different from the first node, the second node connected to the first end of the battery cell;
• measuring, through a second path differing from the first path, a voltage of the second node using a second battery voltage measurement unit;
• and
• performing, using a diagnostic unit, diagnosis using comparison results between measurement results of the first battery voltage measurement unit and measurement results of the second battery voltage measurement unit.