Interface circuitry
First Claim
Patent Images
1. Interface circuitry for an automobile electronic control unit diagnostic scanner, comprising:
- a first resistor;
a second resistor;
a transistor array;
wherein said first resistor is connected at a first end to a collector of a first transistor of the transistor array;
wherein said second resistor is connected at a first end to a collector of a second transistor of the transistor array;
wherein said first and said second resistors are connected at their second ends to a first pin of an link connector; and
wherein a plurality of resistance values can be provided at the first pin of the link connector by biasing a base of the first transistor, the second transistor and a base of both transistors.
5 Assignments
0 Petitions
Accused Products
Abstract
Interface circuitry for linking an automobile diagnostic scanner to the electronic control unit of an automobile. The disclosed circuitry provides a lower cost, reduced board space solution for an universal scan tool interface circuitry.
-
Citations
20 Claims
-
1. Interface circuitry for an automobile electronic control unit diagnostic scanner, comprising:
-
a first resistor;
a second resistor;
a transistor array;
wherein said first resistor is connected at a first end to a collector of a first transistor of the transistor array;
wherein said second resistor is connected at a first end to a collector of a second transistor of the transistor array;
wherein said first and said second resistors are connected at their second ends to a first pin of an link connector; and
wherein a plurality of resistance values can be provided at the first pin of the link connector by biasing a base of the first transistor, the second transistor and a base of both transistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
a base connected to the FPGA through an inverter;
an emitter connected to ground; and
a collector connected to a second pin of the link connector through a fourth resistor; and
wherein a first voltage supply is connected to said emitter of said fourth transistor.
-
-
8. The interface circuitry of claim 7 further comprising a second voltage source connected to said emitter of said fourth transistor.
-
9. The interface circuitry of claim 8 further comprising a fifth transistor having a base connected to an input capture pin from said link connector;
- and
having a collector connected to said FPGA.
- and
-
10. The interface circuitry of claim 9, further comprising a voltage clamp circuit connected to the base of said fifth transistor.
-
11. The interface circuitry of claim 10, wherein said transistor array is a seven segment display driver.
-
12. The interface circuitry of claim 11, wherein said first resistance is a 10 kilo Ohm resistor and said second resistor is a 39.2 kilo Ohm transistor.
-
13. The interface circuitry of claim 12 wherein said first voltage source is 5 volts.
-
14. Interface circuitry for an automobile electronic control unit diagnostic scanner, comprising:
-
means for providing a plurality of resistances at a first and second pin of a link connector; and
means for selecting the resistance to be provided at the first and second pin of said link connector. - View Dependent Claims (15, 16)
-
-
17. A method of accessing trouble codes in an automobile electronic control unit, comprising the steps of:
-
transmitting an electronic signal from a field programmable gate array;
biasing a transistor of a gate array with said transmitted signal; and
receiving an electronic signal at said gate array representative of a trouble code. - View Dependent Claims (18, 19, 20)
-
Specification