CN106528373A - Method for improving core voltage monitoring precision of mainboard - Google Patents

Abstract

The invention particularly relates to a method for improving core voltage monitoring precision of a mainboard. According to the method for improving the core voltage monitoring precision of the mainboard, before a 12V core voltage enters an ADC (Analog-to-Digital Converter) module through a resistor divider, a BMC chip periphery circuit is optimized; and through adjustment of a resistance value of the resistor divider R1 for inputting the 12V core voltage into the ADC module, a voltage monitoring range of the ADC module is increased, and monitoring errors resulting from input saturation are reduced. Moreover, the input of the ADC module is compensated, and the monitoring precision is further improved. According to the method for improving the core voltage monitoring precision of the mainboard, the monitoring precision before the voltage enters the ADC module is greatly improved, and the 12V core voltage can be monitored accurately, thereby accurately judging the health condition of a machine, further improving the stability of the mainboard and improving the reliability of the product.

Description

A Method of Improving the Monitoring Accuracy of Motherboard Core Voltage

technical field

The invention relates to the technical field of server management, in particular to a method for improving the monitoring accuracy of the mainboard core voltage.

Background technique

Usually, in a server system, the motherboard occupies a crucial position, and the health of the motherboard directly determines the service life of the server. The server is used differently in the data center of different customers, and the pressure exerted on the server is also different; according to the pressure exerted by the client, some parameters on the motherboard will change slightly, such as the 12V core voltage on the motherboard. Therefore, users need to monitor the health status of these important parameters in real time, and if there is any abnormality, deal with it immediately to ensure that the server can operate normally under any pressure.

Typically, 12V core voltage is especially important on SMARTRACK rack servers. All the nodes in the SMARTRACK cabinet are powered by the same pair of copper bars. If there is a problem with the 12V voltage, the entire cabinet is at risk. Therefore, the copper bus voltage must be monitored in real time to ensure that the condition of the machine is good.

In the existing design, the copper bar voltage is monitored by monitoring the 12V core voltage on the motherboard. Specifically, it is monitored by the ADC (Analog-to-Digital Converter) module in the BMC (Baseboard Management Controller: Baseboard Management Controller) chip. The 12V voltage enters the ADC module after being divided by resistors, and outputs the monitored voltage value after analog-to-digital conversion. However, if the design of the peripheral monitoring circuit of the chip is unreasonable, the monitoring of the 12V core voltage will produce large errors, and the monitoring accuracy cannot meet the needs of customers.

Based on this, the present invention proposes a method for improving the monitoring accuracy of the mainboard core voltage. The purpose is to improve the voltage monitoring accuracy of the main board by optimizing the design, thereby improving the reliability of the product.

Contents of the invention

In order to make up for the defects of the prior art, the present invention provides a simple and efficient method for improving the monitoring accuracy of the core voltage of the motherboard.

The present invention is achieved through the following technical solutions:

A method for improving the monitoring accuracy of mainboard core voltage is characterized in that: BMC chip peripheral circuit comprises voltage dividing resistor R1, resistance R2 and filter capacitor C1, 12V core voltage is connected to the ADC module of BMC chip through voltage dividing resistor R1, described One end of the resistor R2 and the filtering capacitor C1 are respectively grounded, and the other end is connected between the voltage dividing resistor R1 and the ADC module;

Before the 12V core voltage enters the ADC module through voltage division, optimize the peripheral circuit of the BMC chip, and increase the voltage monitoring range of the ADC module by adjusting the resistance value of the voltage division resistor R1 input from the 12V core voltage to the ADC module, and reduce the loss due to input saturation. The monitoring error caused; at the same time, the input of the ADC module is compensated, thereby further increasing the monitoring accuracy.

The adjustment of the voltage dividing resistor R1 is realized by increasing the resistance value of the voltage dividing resistor R1, and the range of voltage monitoring is increased by increasing the resistance value of the voltage dividing resistor R1, so that the maximum voltage that the ADC module can monitor is greater than the server copper bus voltage ; The compensation for the input of the ADC module is realized by grounding the configuration pin ADC12P of the ADC module, so as to reduce the reading error of the ADC module.

The resistance value of the voltage dividing resistor R1 is increased to 5.6KΩ, and the resistance value of the resistor R2 is 1KΩ.

The beneficial effects of the present invention are: the method for improving the monitoring accuracy of the core voltage of the motherboard greatly improves and improves the monitoring accuracy before entering the ADC module, and can accurately monitor the 12V core voltage, which is convenient for correctly judging the health status of the machine , thereby improving the stability of the motherboard and improving the reliability of the product.

Description of drawings

Accompanying drawing 1 is a schematic diagram of the method for improving the monitoring accuracy of the motherboard core voltage in the present invention.

Accompanying drawing 2 is the schematic diagram of the existing motherboard core voltage monitoring method.

detailed description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The method for improving the monitoring accuracy of the core voltage of the motherboard, the peripheral circuit of the BMC chip includes a voltage dividing resistor R1, a resistor R2 and a filter capacitor C1, the 12V core voltage is connected to the ADC module of the BMC chip through the voltage dividing resistor R1, and the resistor R2 and the filter capacitor One end of C1 is grounded respectively, and the other end is connected between the voltage dividing resistor R1 and the ADC module;

Before the 12V core voltage is divided into the ADC module, optimize the peripheral circuit of the BMC chip. By adjusting the resistance value of the voltage divider resistor R1 input from the 12V core voltage to the ADC module, the monitoring range of the ADC module voltage is increased, and the loss due to input saturation is reduced. The monitoring error caused; at the same time, the input of the ADC module is compensated, thereby further increasing the monitoring accuracy.

The adjustment of the voltage dividing resistor R1 is realized by increasing the resistance value of the voltage dividing resistor R1, and the range of voltage monitoring is increased by increasing the resistance value of the voltage dividing resistor R1, so that the maximum voltage that the ADC module can monitor is greater than the server copper bus voltage ; The compensation for the input of the ADC module is realized by grounding the configuration pin ADC12P of the ADC module, so as to reduce the reading error of the ADC module.

Accompanying drawing 2 is the schematic diagram of the existing motherboard core voltage monitoring method. In the existing design, the voltage dividing resistor R1 is 3.9KΩ, and the resistance value of the resistor R2 is 1KΩ. Since the input voltage range supported by the ADC module is 0-2.5V, that is, the maximum voltage at point A is 2.5V. However, even if point A reaches a maximum of 2.5V, the maximum value that the ADC module can monitor is: (2.5V/1KΩ)*(3.9KΩ+1KΩ)=12.25V. In this case, the voltage higher than 12.25V will be saturated due to the limitation of the ADC module monitoring, and the performance is 12.25V, while the copper bus voltage of the server is 12.5V, so the copper bus voltage cannot be monitored correctly. At the same time, the ADC module itself has a certain reading error, the error is 0.0625V without compensation, and the error is 0.025V with compensation. The combination of two factors results in a low accuracy of 12V core voltage monitoring.

In order to solve the accuracy error caused by monitoring input saturation, the resistance value of the voltage dividing resistor R1 is adjusted from 3.9KΩ to 5.6KΩ. After adjustment, the maximum voltage that can be monitored is: (2.5V/1KΩ)*(5.6KΩ+1KΩ)=16.5V, which is greater than the copper bus voltage of the server, which solves the error caused by monitoring input saturation. At the same time, in order to eliminate the reading error of the ADC itself, a configuration pin ADC12P in the ADC module is grounded, so that the reading accuracy of the ADC module can be reduced to 0.025V. The two work together to solve the problem of low monitoring accuracy of the 12V core voltage.

The method of improving the monitoring accuracy of the core voltage of the motherboard has greatly improved and improved the monitoring accuracy before entering the ADC module, and can accurately monitor the 12V core voltage, which is convenient for correctly judging the health status of the machine, thereby improving the stability of the motherboard performance, improving the reliability of the product.

Claims (3)

1. It is 1. a kind of to improve the method that mainboard core voltage monitors precision, it is characterised in that：BMC chip periphery circuit includes partial pressure electricity Resistance R1, resistance R2 and filter capacitor C1,12V core voltage Jing divider resistance R1 are connected to the ADC of BMC chip, the electricity One end of resistance R2 and filter capacitor C1 is each grounded, and the other end is connected between the divider resistance R1 and ADC；

   In 12V core voltages before partial pressure enters ADC, optimize BMC chip periphery circuit, by adjusting 12V cores The divider resistance R1 resistances of control source to ADC, increase the scope of ADC voltage monitoring, reduce due to being input into saturation And the monitoring error for causing；Simultaneously ADC input is compensated, so as to further increase the precision of monitoring.
2. It is 2. according to claim 1 to improve the method that mainboard core voltage monitors precision, it is characterised in that：To the partial pressure The adjustment of resistance R1 is realized by the resistance of increase divider resistance R1, increases voltage by the resistance for increasing divider resistance R1 and supervise The scope of control, enables the maximum voltage that ADC is monitored to be more than server copper bar voltage；Compensation to ADC input Realized by the configuration pin ADC12P ground connection by ADC, to reduce the reading error of ADC.
3. It is 3. according to claim 2 to improve the method that mainboard core voltage monitors precision, it is characterised in that：The partial pressure electricity The resistance of resistance R1 increases to 5.6K Ω, and resistance R2 resistances are 1K Ω.