System and method to determine a power-up parameter for a circuit board

• US 10,644,692 B2
• Filed: 09/07/2016
• Issued: 05/05/2020
• Est. Priority Date: 09/07/2016
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola Solutions, Inc.
• Inventors: Viviescas, David, Leung, Chun P., Stuart, Kirk B.
• Primary Examiner(s): Huynh, Kim
• Assistant Examiner(s): Neveln, Joshua
• Application Number:
  US15/258,841
• Publication Number:
  US 20180067534A1
• Time in Patent Office: 1,336 Days
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: H03K 17/22 Modifications for ensuring a predetermined initial state when the supply voltage has been applied bi-stable generators H03K3/12

Abstract

A system and method to determine a power-up parameter for a circuit board. The method includes electrically exciting a second-order circuit to generate an underdamped transient response. The method includes receiving, at a comparator coupled to the second-order circuit, the underdamped transient response. The method includes generating, in response to the underdamped transient response received at the comparator, a plurality of edges. The method includes receiving, at a single general purpose input/output pin of the electronic processor, the plurality of edges. The method includes determining a first response parameter based on a plurality of edges. The method includes determining a second response parameter based on the plurality of edges. The method includes determining the power-up parameter based on the first response parameter and the second response parameter.

Claims

1. A method to determine a power-up parameter for a circuit board including an electronic processor, the method comprising:

electrically exciting a second-order circuit to generate an underdamped transient response;

receiving, at a comparator coupled to the second-order circuit, the underdamped transient response;

generating, in response to the underdamped transient response received at the comparator, a plurality of edges;

receiving, at a single general purpose input/output pin of the electronic processor, the plurality of edges;

determining a discharge time based on the plurality of edges;

determining a damping frequency based on the plurality of edges;

determining the power-up parameter based on the discharge time and the damping frequency; and

controlling the circuit board based on the power-up parameter.

2. The method of claim 1, wherein generating a plurality of edges includes generating at least one rising edge and at least one falling edge.

3. The method of claim 1, wherein determining the power-up parameter includes determining one of a board identifier and a power-up sequence identifier.

4. The method of claim 1, further comprising:

retrieving, from a memory coupled to the electronic processor, a capacitance value based on the discharge time;

retrieving from the memory an inductance value based on the capacitance value and the damping frequency; and

wherein determining the power-up parameter includes retrieving the power-up parameter from the memory based on the capacitance value and the inductance value.

5. The method of claim 4, further comprising:

retrieving a resistance value based on the discharge time, wherein determining the power-up parameter includes retrieving the power-up parameter based on the resistance value.

6. The method of claim 1, further comprising:

determining a peak voltage value received from an analog to digital converter coupled to the second-order circuit;

wherein determining the power-up parameter includes determining the power-up parameter based on the peak voltage value.

7. The method of claim 1, further comprising:

controlling at least one power regulator based on the power-up parameter.

8. A system to determine a power-up parameter for a circuit board, the system comprising:

a second-order circuit configured to generate an underdamped transient response when electrically excited; and

a comparator coupled to the second-order circuit and configured to, in response to receiving the underdamped transient response, generate a plurality of edges;

an electronic processor, coupled to the comparator, and configured to

receive, at a single general purpose input/output pin, the plurality of edges;

determine a discharge time based on the plurality of edges;

determine a damping frequency based on the plurality of edges;

determine the power-up parameter based on the discharge time and the damping frequency; and

control the circuit board based on the power-up parameter.

9. The system of claim 8, wherein the plurality of edges includes at least one rising edge and at least one falling edge.

10. The system of claim 8, wherein the power-up parameter is one of a board identifier and a power-up sequence identifier.

11. The system of claim 8, further comprising:

a memory coupled to the electronic processor, wherein the electronic processor is configured to retrieve from the memory a capacitance value based on the discharge time;

retrieve from the memory an inductance value based on the capacitance value and the damping frequency; and

retrieve the power-up parameter from the memory based on the capacitance value and the inductance value.

12. The system of claim 11, wherein the electronic processor is configured to retrieve a

resistance value based on the discharge time;

and

retrieve the power-up parameter from the memory based on the resistance value.

13. The system of claim 8, further comprising:

an analog to digital converter coupled to the second-order circuit, wherein the electronic processor is configured to

determine a peak voltage value received from the analog to digital converter;

determine the power-up parameter based on the peak voltage value.

14. The system of claim 8, further comprising:

at least one power regulator, wherein the electronic processor is configured to control the at least one power regulator based on the power-up parameter.

15. The system of claim 8, wherein the electronic processor is configured to control the circuit board based on the power-up parameter.

16. A method to determine a power-up parameter for a circuit board including an electronic processor, the method comprising:

electrically exciting a second-order circuit to generate an underdamped transient response;

receiving, at a single general purpose input/output pin of the electronic processor, the underdamped transient response;

generating, in response to the underdamped transient response received at the single general purpose input/output pin of the electronic processor, a plurality of edges;

determining a discharge time based on the plurality of edges;

determining a damping frequency based on the plurality of edges;

determining the power-up parameter based on the discharge time and the damping frequency; and

controlling the circuit board based on the power-up parameter.