US 12,222,406 B2
Integrated circuit device
Yasuo Shima, Hitachinaka (JP); Keishi Komoriyama, Hitachinaka (JP); and Yoichiro Kobayashi, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 18/011,461
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Feb. 5, 2021, PCT No. PCT/JP2021/004251
§ 371(c)(1), (2) Date Dec. 19, 2022,
PCT Pub. No. WO2021/260991, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 2020-107204 (JP), filed on Jun. 22, 2020.
Prior Publication US 2023/0266405 A1, Aug. 24, 2023
Int. Cl. G01R 31/54 (2020.01)
CPC G01R 31/54 (2020.01) 8 Claims
OG exemplary drawing
 
1. An integrated circuit device connected to a load and controlling a load current supplied to the load, the integrated circuit device comprising:
a drive circuit having a switch element and using the switch element to switch between conduction and interruption of the load current;
a control circuit generating a signal for operation of the drive circuit;
a first ground line grounded to a common ground provided outside the integrated circuit device via a first ground connection terminal and connected to the drive circuit;
a second ground line grounded to the common ground via a second ground connection terminal and connected to the control circuit;
a diagnostic current supply circuit supplying a predetermined diagnostic current to the first ground line;
a bidirectional rectifying element connected between the first ground line and the second ground line; and
a diagnostic circuit measuring a potential difference between the first ground line and the second ground line and comparing the potential difference with a predetermined comparison voltage to diagnose a grounding state of the first ground line.