Integrated circuit having first and second magnetic field sensing elements

• US 9,859,489 B2
• Filed: 05/08/2015
• Issued: 01/02/2018
• Est. Priority Date: 01/20/2006
• Status: Active Grant

• Current Assignee: Allegro Microsystems Incorporated (Sanken Electric Company Limited)
• Original Assignee: Allegro Microsystems Incorporated (Sanken Electric Company Limited)
• Inventors: Doogue, Michael C., Taylor, William P., Mangtani, Vijay
• Primary Examiner(s): Whalen, Daniel
• Application Number:
  US14/707,319
• Publication Number:
  US 20150243882A1
• Time in Patent Office: 970 Days
• Field of Search: None
• CPC Class Codes: B82Y 25/00 Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
• CPC Class Codes: G01R 15/08 Circuits for altering the measuring range
• CPC Class Codes: G01R 15/207 Constructional details independent of the type of device used
• CPC Class Codes: G01R 33/02 Measuring direction or magnitude of magnetic fields or magnetic flux G01R33/20 takes precedence
• CPC Class Codes: G01R 33/06 using galvano-magnetic devices
• CPC Class Codes: G01R 33/07 Hall effect devices
• CPC Class Codes: G01R 33/09 Magnetoresistive devices
• CPC Class Codes: G01R 33/093 using multilayer structures, e.g. giant magnetoresistance sensors thin magnetic films H01F10/00
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 23/49541 Geometry of the lead-frame
• CPC Class Codes: H01L 25/162 the devices being mounted on two or more different substrates
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• CPC Class Codes: H10N 50/10 Magnetoresistive devices
• CPC Class Codes: H10N 50/80 Constructional details
• CPC Class Codes: H10N 52/101 Semiconductor Hall-effect devices
• CPC Class Codes: H10N 52/80 Constructional details

Abstract

An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.

Claims

1. An integrated circuit, comprising:

a first magnetic field sensing element for providing a first sensitivity to a magnetic field;

a second magnetic field sensing element for providing a selected second different sensitivity to the magnetic field; and

a circuit coupled to the first and second magnetic field sensing elements, operable to provide the integrated circuit with a first operating range responsive to the first magnetic field sensing element and a second selected different operating range responsive to the second magnetic field sensing element, wherein the first and second magnetic field sensing elements are different types of magnetic field sensing elements, wherein the different types of magnetic field sensing elements are two different types in a group of types of magnetic field sensing elements comprising a planar Hall effect element, a vertical Hall effect element, a giant magnetoresistance (GMR) element, an anisotropic magnetoresistance (AMR) element, and a tunneling magnetoresistance (TMR) element.

2. The integrated circuit of claim 1, wherein the first magnetic field sensing element comprises the planar Hall effect element and the second magnetic field sensing element comprises the vertical Hall effect element.

3. The integrated circuit of claim 1, further comprising a lead frame having a plurality of leads, wherein at least two of the plurality of leads are coupled to form a current conductor portion, wherein the current conductor portion is disposed proximate to the first and second magnetic field sensing elements, and wherein the integrated circuit is responsive to a current flowing through the current conductor portion.

4. The integrated circuit of claim 1, further comprising a conductor, wherein the integrated circuit is adapted to be responsive to magnetic field generated by a current passing through the conductor.

5. The integrated circuit of claim 1, further comprising a substrate, wherein the first and second magnetic field sensing elements are supported by the substrate, wherein the substrate comprised of a selected one of Si, GaAs, InP, InSb, InGaAs, InGaAsP, SiGe, ceramic, or glass.

6. The integrated circuit of claim 1, further including at least one flux concentrator disposed proximate to at least one of the first magnetic field sensing element or the second magnetic field sensing element.

7. The integrated circuit of claim 1, wherein the integrated circuit is adapted to be responsive to a current passing through a wire.

8. The integrated circuit of claim 1, further comprising:

a current conductor disposed proximate to the first or second magnetic field sensing elements; and

a flux concentrator shaped so that a first portion of the flux concentrator is disposed under the first and second magnetic field sensing elements and a second portion of the flux concentrator is disposed above the first and second magnetic field sensing elements.

9. The integrated circuit of claim 1, wherein the first magnetic field sensing element comprises the vertical Hall effect element and the second magnetic field sensing element comprises the giant magnetoresistance element, the anisotropic magnetoresistance element, or the tunneling magnetoresistance element.

10. An integrated circuit, comprising:

a substrate;

a first magnetic field sensing element disposed on a surface of the substrate;

a second magnetic field sensing element disposed on the surface of the substrate; and

a circuit coupled to the first and second magnetic field sensing elements, the circuit operable to provide the integrated circuit with a first operating range responsive to the first magnetic field sensing element and a second selected different operating range responsive to the second magnetic field sensing element, wherein the second magnetic field sensing element has a different structure than the first magnetic field sensing element, wherein the first and second magnetic field sensing elements are different types of magnetic field sensing elements, wherein the different types of magnetic field sensing elements are two different types in a group of types of magnetic field sensing elements comprising a planar Hall effect element, a vertical Hall effect element, a giant magnetoresistance (GMR) element, an anisotropic magnetoresistance (AMR) element, and a tunneling magnetoresistance (TMR) element.

11. The integrated circuit of claim 10, further comprising a conductor, wherein the integrated circuit is adapted to be responsive to magnetic field generated by a current passing through the conductor.

12. The integrated circuit of claim 10, wherein the first magnetic field sensing element comprises the planar Hall effect element or the vertical Hall effect element and the second magnetic field sensing element comprises the giant magnetoresistance element, the anisotropic magnetoresistance element, or the tunneling magnetoresistance element.

13. The integrated circuit of claim 10, further comprising a circuit element disposed on the surface of the substrate.

14. The integrated circuit of claim 10, further comprising a lead frame having a plurality of leads, wherein at least two of the plurality of leads are coupled to form a current conductor portion, wherein the current conductor portion is disposed proximate to the first and second magnetic field sensing elements, and wherein the integrated circuit is responsive to a current flowing through the current conductor portion.

15. The integrated circuit of claim 14, further comprising a conductor, wherein the integrated circuit is adapted to be responsive to magnetic field generated by a current passing through the conductor.

16. The integrated circuit of claim 10, further including at least one flux concentrator disposed proximate to at least one of the first magnetic field sensing element or the second magnetic field sensing element.

17. The integrated circuit of claim 10, wherein the integrated circuit is adapted to be responsive to a current passing through a wire.

18. The integrated circuit of claim 10, further comprising:

a current conductor disposed proximate to the first or second magnetic field sensing elements; and

a flux concentrator shaped so that a first portion of the flux concentrator is disposed under the first and second magnetic field sensing elements and a second portion of the flux concentrator is disposed above the first and second magnetic field sensing elements.

19. The integrated circuit of claim 10, wherein the first magnetic field sensing element comprises the planar Hall effect element and the second magnetic field sensing element comprises the vertical Hall effect element.

20. The integrated circuit of claim 10, wherein the first magnetic field sensing element comprises the vertical Hall effect element and the second magnetic field sensing element comprises the giant magnetoresistance element, the anisotropic magnetoresistance element, or the tunneling magnetoresistance element.

21. An integrated circuit, comprising:

a first magnetic field sensing element;

a second magnetic field sensing element;

a circuit coupled to the first and second magnetic field sensing elements, wherein the first and second magnetic field sensing elements are different types of magnetic field sensing elements, wherein the different types of magnetic field sensing elements are two different types in a group of types of magnetic field sensing elements comprising a planar Hall effect element, a vertical Hall effect element, a giant magnetoresistance (GMR) element, an anisotropic magnetoresistance (AMR) element, and a tunneling magnetoresistance (TMR) element; and

a conductor, wherein the integrated circuit is adapted to be responsive to magnetic field generated by a current passing through the conductor.

22. The integrated circuit of claim 21, wherein the first magnetic field sensing element comprises the planar Hall effect element and the second magnetic field sensing element comprises the vertical Hall effect element.

23. The integrated circuit of claim 21, further comprising a conductor, wherein the integrated circuit is adapted to be responsive to magnetic field generated by a current passing through the conductor.

24. The integrated circuit of claim 21, further comprising:

a substrate, wherein the first magnetic field sensing element, the second magnetic field sensing element, and the circuit are disposed upon the substrate.

25. The integrated circuit of claim 21, wherein the first magnetic field sensing element comprises the vertical Hall effect element and the second magnetic field sensing element comprises the giant magnetoresistance element, the anisotropic magnetoresistance element, or the tunneling magnetoresistance element.