Overview

In the current technology-driven era, pressure measurement plays a crucial role in numerous fields. Pressure transmitters, as key devices for converting pressure signals into standard electrical signals, their technological development and application effectiveness are directly related to the production safety, efficiency improvement, and innovation breakthroughs in various industries. This article will elaborate on the chip solutions launched by Corebai to address the current status and pain points of pressure transmitters.

 

1. Current Status and Pain Point Analysis

As a key equipment in industrial automation systems, pressure transmitters are widely used in industries such as petroleum, chemical engineering, electric power, automobiles, and aerospace to accurately monitor the pressure of media such as liquids, gases, and vapors. With the popularization of industrial automation and the continuous increase in requirements for data accuracy, the technology of pressure transmitters is also constantly advancing. Modern pressure transmitters not only need to have high precision and stability but also need to meet the long-term reliable operation under harsh environments. Especially in complex working conditions such as high temperature, high humidity, and strong electromagnetic interference, how to ensure sensing accuracy and equipment stability has become the key to design.

Precision and Resolution Problems: In applications requiring extremely high precision (such as the chemical and aerospace industries), there is still a lack of sufficient accuracy. Especially in high-noise environments or under rapidly changing pressure conditions, the measurement error of the pressure transmitter may lead to a decline in system performance.

Insufficient Environmental Adaptability: In industrial environments with strong electromagnetic interference (EMI), vibration, or large temperature fluctuations, pressure transmitters may be affected by external factors, resulting in signal drift or inaccurate measurement.

Dynamic Response Lag: In the pressure control systems of automated production lines or high-speed fluid pipelines, the response speed of the pressure transmitter is particularly important. However, some existing products have a response delay problem when processing rapidly changing pressure signals, affecting the real-time control ability of the system.

Long-term Stability: In some extreme working environments (such as high temperature, low temperature, or environments with large temperature differences), the accuracy of the pressure transmitter will drift due to temperature changes, resulting in inaccurate measurement. In addition, long-term operation may lead to equipment aging or performance degradation, which requires pressure transmitters to have better long-term stability and environmental adaptability.

2. Corebai' Pressure Transmitter Chip Solution

In response to the industry status, Corebai has launched high-performance chip products such as CBM76AD06G (ADC), CBM53D24 and CBM128S085 (DAC), CBM27 and CBM8656 (OPA), to achieve accurate processing and conversion of pressure signals.

Pressure Transmitter Application Block Diagram

1. High-Precision ADC: CBM76AD06G

The ADC is used to convert the weak analog signal output by the sensor into a digital signal for subsequent digital processing systems to process and analyze. By using a high-precision ADC chip, it can ensure that the signal collected from the pressure sensor is accurately and reliably converted into a digital form, thereby obtaining an accurate pressure reading.

l Multi-channel Input: The CBM76AD06G supports 8-channel analog signal input, which enables it to process multiple signal sources simultaneously and is suitable for complex data acquisition systems.

l High-Precision Analog-to-Digital Conversion: It provides 16-bit analog-to-digital conversion, which means it can accurately convert the analog signal into a digital form and is very suitable for application scenarios that require high-precision data.

l Synchronous Sampling Capability: The CBM76AD06G has the synchronous sampling capability, which ensures the data consistency and accuracy among various channels during high-speed data acquisition.

l Built-in Protection Function: It integrates analog input clamp protection, which can protect the internal circuit from damage under overvoltage conditions and improve the reliability of the system.

l Anti-aliasing Filter: The built-in second-order anti-aliasing filter helps reduce the influence of high-frequency noise and ensures signal quality.

 

2. DAC: CBM53D24, CBM128S085

The DAC is usually used to convert the processed digital signal back into an analog signal for interfacing with analog control systems or display devices. For example, when the pressure value needs to be displayed on an analog instrument, the DAC can convert the digital signal into a corresponding current or voltage signal to drive the analog instrument to display the pressure value.

CBM53D24:

l Low Power Consumption: The low power consumption of the CBM53D24 under 3V power supply makes it very suitable for battery-powered or low-power applications.

l High Resolution: The 12-bit resolution provides accurate analog output and is suitable for applications that require high precision.

l Multi-channel Output: The 4-channel buffered voltage output enables it to control multiple analog signals simultaneously, increasing the flexibility of the application.

l Wide Voltage Range: The supply voltage range from 2.5V to 5.5V enables it to adapt to different power supply conditions.

l Compatibility: The 3-wire serial interface is compatible with multiple communication protocols such as SPI, QSPI, MICROWIRE, and DSP, facilitating connection with various microcontrollers and processors.

 

CBM128S085:

Multi-channel Output: The CBM128S085 provides 8 voltage analog output channels, which can meet the needs for multiple analog signals in various application scenarios.

l High Precision and Low Noise: The CBM128S085 performs excellently in terms of precision and noise control, which is crucial for applications requiring high-precision analog output.

l External Reference Voltage Input: This DAC supports external reference voltage input, and users can adjust the reference voltage according to specific requirements to obtain the desired analog output range and precision.

l Flexible Interface Configuration: The CBM128S085 supports SPI interface for data transmission, making its connection with digital devices such as microcontrollers simple and efficient.

l Wide Application Fields: Due to its multi-channel, high-precision, and low-noise characteristics, the CBM128S085 is suitable for multiple fields such as audio processing, data acquisition, and industrial control.

 

3. Precision Amplifier OPA: CBM27, CBM8656

Amplifying Weak Signals: The amplitude of the pressure analog signal output by the DAC is sometimes small, and the OPA can further amplify this signal to an appropriate level to drive the display device or achieve long-distance transmission.

Improving Signal Quality: The OPA can filter the output signal of the DAC to remove the noise interference introduced during the conversion process, making the signal pure and stable, and improving the pressure measurement accuracy and reliability.

CBM27:

l Low Noise: The CBM27 provides excellent low-noise and high-precision amplification performance for low-level signals. Its extremely low noise level (en = 3.8nV/√Hz at 10 Hz) makes it very suitable for applications that require a high signal-to-noise ratio.

l High-Precision Amplification Performance: The CBM27 has a high open-loop gain (1800V/mV) and can provide large-amplitude signal amplification while maintaining signal integrity.

l Wide Voltage Power Supply Range: This operational amplifier supports a wide voltage power supply range from ±4V to ±18V, adapting to different power supply conditions and increasing the flexibility of the design.

l High-Speed Performance: The gain-bandwidth product of 8 MHz and the slew rate of 2.8 V/μs enable the CBM27 to achieve excellent dynamic accuracy in high-speed data acquisition systems.

l Low Input Offset Voltage: The offset voltage of the CBM27 is as low as 26μV, with a drift of 0.2μV/°C, which helps maintain stable performance in temperature-changing environments.

l Good Load Driving Capability: The output stage has good load driving capability, with a ±10 V guaranteed swing (600 Ω load) and low output distortion, making it an excellent choice for professional audio applications.

 

CBM8656:

l Low Noise: At 10 kHz, its noise is only 2.7nV/√Hz, which makes it perform well in applications that require extremely high signal purity.

l High DC Precision: This amplifier can achieve high DC precision, ensuring the accuracy and reliability of the data.

l Rail-to-rail Input and Output: The CBM8656 is a voltage-feedback rail-to-rail input and output precision CMOS amplifier. This design allows it to handle signals close to the power supply rails, thereby improving the dynamic range and signal processing ability.

l Offset Voltage Drift: The offset voltage drift of the CBM8656 is typically 0.4 µV/°C, with a maximum value of 2.3µV/°C, which helps maintain stable performance in temperature-changing environments.

l Bandwidth: The gain-bandwidth product of the CBM8656 is 27 MHz, and the conversion rate is 11 V/μs, which enables it to quickly respond to signal changes.

 

 

Application Scenarios

Industrial Automation Field - Automobile Manufacturing Factory

In the automated production line of an automobile manufacturing factory, the chip can accurately monitor the fuel pipeline pressure, ensuring that the pressure measurement error is controlled within a very small range, making the fuel injection pressure accurate and stable, optimizing fuel utilization, and reducing exhaust emissions to a certain extent. In the braking system detection, with the assistance of the CBM27 chip, the accurate measurement of the braking pipeline pressure is realized, providing a strong guarantee for driving safety. And the CBM76AD06G chip can realize the simultaneous monitoring of multiple pressure points in the complex production line, helping to improve production efficiency and reduce the scrap rate.

Petrochemical Field - Pipeline Pressure Monitoring

In the pipeline transportation system of the petrochemical industry, the high-precision measurement and high stability of the CBM76AD06G chip can effectively monitor the pressure of liquids or gases in the pipeline. Its built-in protection function protects the internal circuit under overvoltage conditions, improves the reliability of the system, and prevents safety accidents such as pipeline leakage and explosion.