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Method and system for correcting parameter

A technology of parameter calibration and parameter calibration, applied in the direction of analog/digital conversion calibration/test, etc., can solve the problems affecting the development and application of MSP430

Active Publication Date: 2008-08-27
LIERDA SCI & TECH GRP
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Problems solved by technology

[0002] At present, the use of MSP430 A / D internal reference voltage (referred to as Vref), DCO and external OSC will have deviations to a large extent. There is no method and system that can accurately correct its parameters, which directly affects the development and application of MSP430.

Method used

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  • Method and system for correcting parameter

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Experimental program
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Embodiment 1

[0042] Embodiment 1: with reference to attached Figure 1-7 .

[0043] MSP430 internal reference voltage calibration (take F449 internal ADC12 as an example).

[0044] The reference voltage of ADC12 inside MSP430 has 1.5V and 2.5V, but due to internal deviation, the range of 1.5V reference voltage is 1.4V-1.6V, and the range of 2.5V reference voltage is 2.44V-2.56V. In this way, the internal reference voltage should be calibrated before AD sampling. The method we adopt here is: input a 1.25V standard voltage signal in the A0 channel of AD, and then use the internal 1.5V or 2.5V reference voltage to sample the standard The 1.25V input voltage, and then through the AD sampling value 1.5_Value, 2.5_Value, calculate the actual value of the reference voltage of the current MSP430 internal ADC12, the specific calculation formula is as follows:

[0045] Vref _ 1.5 = 4095 * Vref 1.5 ...

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Abstract

The invention relates to a parameter correction method to make internal reference voltage, DCO and external OSC more precise in use, and a correction system. Vref, DCO or OSC calibration programs are downloaded to a target MCU and then the calibration programs are executed, and the actual Vref, DCO or OSC calibration programs after calibration are written to Information A, so a user can use conveniently, thus limiting measurement error and improving timepiece precision.

Description

technical field [0001] The invention relates to a parameter correction method and a correction system for making internal reference voltage, DCO and external OSC more accurate in use. Background technique [0002] At present, the use of internal reference voltage (Vref for short), DCO and external OSC of MSP430 A / D will have deviations to a large extent. There is no method and system that can accurately correct its parameters, which directly affects the development and application of MSP430. Contents of the invention [0003] Design purpose: To avoid the deficiencies in the background technology, to design a parameter calibration method and parameter calibration system for MSP430 parameter calibration. [0004] Design scheme: Due to the use of the 12bit A / D internal reference voltage (Vref for short), DCO and external OSC of MSP430, there will be deviations to a large extent, which are mainly reflected in the following aspects: [0005] Internal reference voltage (Vref fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
Inventor 梁源贾灵周震宇陈秋煌张冲孙瑶
Owner LIERDA SCI & TECH GRP