Apparatus with optical functionality and associated methods

• US 8,405,030 B2
• Filed: 11/25/2010
• Issued: 03/26/2013
• Est. Priority Date: 04/13/2010
• Status: Active Grant

• Current Assignee: Silicon Laboratories Incorporated
• Original Assignee: Silicon Laboratories Incorporated
• Inventors: Rueger, Timothy T., Hong, William, Andreas, David
• Primary Examiner(s): Gaworecki, Mark R
• Application Number:
  US12/954,637
• Publication Number:
  US 20110248171A1
• Time in Patent Office: 852 Days
• Field of Search: 250/338.1, 250/339.02, 250/339.05, 250/339.11, 250/339.14, 250/340
• US Class Current: 250/338.1
• CPC Class Codes: G01J 1/4204 with determination of ambient light solar light G01J2001/4266
• CPC Class Codes: G01J 1/44 Electric circuits for command of an exposure part G03B7/02
• CPC Class Codes: G01S 11/12 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/04 Systems determining the presence of a target
• CPC Class Codes: G01S 17/08 for measuring distance only indirect measurement G01S17/46; active triangulation systems G01S17/48
• CPC Class Codes: G01S 17/46 Indirect determination of position data
• CPC Class Codes: G01S 3/7803 Means for monitoring or calibrating
• CPC Class Codes: G01S 3/7835 using coding masks
• CPC Class Codes: G01S 7/4811 common to transmitter and receiver
• CPC Class Codes: G01S 7/4913 Circuits for detection, sampling, integration or read-out
• CPC Class Codes: G01S 7/497 Means for monitoring or calibrating
• CPC Class Codes: G01S 7/4972 Alignment of sensor
• CPC Class Codes: G01V 8/20 using multiple transmitters or receivers

Abstract

In an exemplary embodiment, an apparatus includes a sensor integrated circuit (IC). The at least one integrated photodetector that is adapted to sense light, and an integrated analog-to-digital converter (ADC). The integrated analog-to-digital converter (ADC) is coupled to the at least one integrated photodetector, and is adapted to convert an output signal of one or more of the at least one integrated photodetector to one or more digital signals. The sensor integrated circuit (IC) further includes an integrated controller that is adapted to facilitate operation of the sensor integrated circuit (IC).

Claims

1. An apparatus, comprising:

a sensor integrated circuit (IC), comprising;

at least one integrated photodetector adapted to sense light;

an integrated analog-to-digital converter (ADC) coupled to the at least one integrated photodetector, and adapted to convert an output signal of one or more of the at least one integrated photodetector to one or more digital signals, the ADC having improved resolution and sensitivity by being directly coupled to the at least one integrated photodetector and by using per-measurement calibration; and

an integrated controller adapted to facilitate operation of the sensor integrated circuit (IC).

2. The apparatus according to claim 1, wherein the at least one integrated photodetector comprises a visible ambient light sensor (ALS).

3. The apparatus according to claim 1, wherein the at least one integrated photodetector comprises an infrared ambient light sensor (ALS).

4. The apparatus according to claim 1, wherein the at least one integrated photodetector comprises a proximity sensor.

5. The apparatus according to claim 1, wherein the at least one integrated photodetector couples to the integrated analog-to-digital converter (ADC) via an analog multiplexer (MUX).

6. The apparatus according to claim 1, further comprising an integrated programmable light emitting diode (LED) driver coupled to the integrated controller.

7. The apparatus according to claim 6, wherein the integrated programmable light emitting diode (LED) driver drives at least one light emitting diode (LED) external to the sensor integrated circuit (IC).

8. The apparatus according to claim 7, wherein the at least one light emitting diode (LED) comprises an infrared light emitting diode (LED).

9. The apparatus according to claim 1, further comprising a host processor adapted to communicate with the integrated controller.

10. The apparatus according to claim 9, wherein the host processor communicates with the integrated controller via host interface circuitry integrated in the sensor integrated circuit (IC).

11. A system, comprising:

a first sensor integrated circuit (IC), comprising a first serial interface, the first sensor integrated circuit (IC) further comprising an integrated proximity sensor adapted to sense proximity of an object to the first sensor integrated circuit (IC) and/or an integrated ambient sensor (ALS) adapted to sense ambient light, the sensed ambient light being photopically corrected; and

a host processor coupled to the first sensor integrated circuit (IC) via the first serial interface,

wherein the first sensor integrated circuit (IC) communicates a signal related to the proximity of the object and/or a signal related to the ambient light.

12. The system according to claim 11, wherein the first sensor integrated circuit (IC) communicates with the host processor via a serial bus.

13. The system according to claim 12, further comprising a second sensor integrated circuit (IC), comprising a second serial interface, wherein the second sensor integrated circuit (IC) is coupled to the host processor via the serial bus.

14. The system according to claim 12, further comprising at least one peripheral coupled to the serial bus.

15. The system according to claim 11, wherein the first sensor integrated circuit (IC) comprises an integrated light emitting diode (LED) driver adapted to drive at least one light emitting diode (LED).

16. The system according to claim 15, wherein the first sensor integrated circuit (IC) drives the at least one light emitting diode (LED) via at least one general purpose input output (GPIO) interface.

17. The system according to claim 11, further comprising communication circuitry.

18. The system according to claim 11, wherein the first sensor integrated circuit (IC) is coupled to a controller external to the first sensor integrated circuit (IC).

19. The system according to claim 11, wherein the first sensor integrated circuit (IC) is coupled to a sensor external to the first sensor integrated circuit (IC).

20. A method of sensing light using a sensor integrated circuit (IC), the method comprising:

sensing light by using at least one integrated photodetector to generate at least one signal related to the sensed light;

converting the at least one signal to a at least one digital signal by using an integrated analog-to-digital converter (ADC) having improved resolution and sensitivity by being directly coupled to the at least one integrated photodetector via an analog multiplexer (MUX) and by using per-measurement calibration;

controlling the sensing and converting operations by using an integrated controller.

21. The method according to claim 20, wherein sensing light by using at least one integrated photodetector comprises sensing infrared light to determine proximity of a nearby object.

22. The method according to claim 20, wherein sensing light by using at least one integrated photodetector comprises sensing ambient infrared light and/or sensing ambient visible light.

23. The method according to claim 20, further comprising driving at least one infrared light emitting diode (LED) by using an integrated light emitting diode (LED) driver.

24. The method according to claim 20, wherein driving at least one infrared light emitting diode (LED) further comprises programming a drive current of the at least one infrared light emitting diode (LED).