Shift-switchable configuration resistor detection method and circuit
A resistance detection and circuit technology, applied in the measurement of resistance/reactance/impedance, measurement device, measurement of electrical variables, etc., can solve the problem that the detection circuit cannot correctly obtain digital code bits and other problems
Active Publication Date: 2022-08-05
X-SIGNAL INTEGRATED CO
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Problems solved by technology
In an actual circuit, if you want to reduce the current source IR to obtain a larger value range of the configuration resistor R, then when the resistance value R of the configuration resistor is in a small range, the current source I The error of sub>R and the analog-to-digital conversion circuit will make the detection circuit unable to correctly obtain the digital code bits
Method used
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Embodiment
[0026] According to as figure 2 In the configuration resistance detection circuit of this embodiment shown, the configuration resistance detection method in this embodiment includes:
[0027] First, the first current source is turned on by the control of the encoding operation circuit to output the first current value I R1 to the configuration resistor R, a voltage V is generated across the configuration resistor R R1 , that is, V R =I R1 ·R;
[0028] Subsequently, the voltage V is converted by the analog-to-digital conversion circuit R1 Converted to the first type of digital code, and the encoding operation circuit judges whether the first type of digital code is greater than or equal to the threshold value according to the preset threshold value, if the first type of digital code is smaller than the threshold value, the current source is not switched.
[0029] If the first type of digital code is greater than or equal to the threshold, the first current source is turne...
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The invention discloses a gear-switchable configuration resistor detection method, which comprises the following steps of: controlling to open a first current source to output a first current value to a configuration resistor by using a coding code operation circuit, and generating a first voltage on the configuration resistor; converting the first voltage into a first type of digital code by using an analog-to-digital conversion circuit, and judging whether the first type of digital code is greater than or equal to a preset threshold value or not by a coding operation circuit according to the preset threshold value; if the first type of digital code is greater than or equal to the threshold value, turning off the first current source, turning on the second current source, outputting a second current value to the configuration resistor, and regenerating a second voltage on the configuration resistor; converting the second voltage into a second type of digital codes by using an analog-to-digital conversion circuit; the second current value is smaller than the first current value; and generating control parameter codes according to the first type of digital codes and the second type of digital codes.
Description
technical field [0001] The present invention relates to the technical field of integrated circuits, and in particular, to a switchable gear position configuration resistance detection method and circuit. Background technique [0002] In chip applications, by configuring resistors to obtain digital code bits, the external resistor value can be adjusted to set the same chip with different functions and parameters, so that more choices can be obtained at a lower cost. This method has the characteristics of low cost and flexible configuration in chip applications with a variety of optional functions and parameters, and is used more and more widely. For chips that do not have this function, customers can only achieve this requirement by replacing chips of different models. However, the existing configuration resistance detection method uses a fixed current method to detect the configuration resistance, which is limited by the voltage conversion range of the detection circuit, an...
Claims
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Login to View More IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 齐伟
Owner X-SIGNAL INTEGRATED CO