CXEP2350 is a high-performance single-phase multifunctional metering chip that uses advanced ∑ - Δ conversion technology and digital signal processing architecture to accurately measure active power, current effective value, and voltage effective value. The chip is equipped with a 3.579MHz high-precision oscillator and a 2.43V reference voltage source, which can achieve stable operation without the need for external clocks and reference components. Its unique anti static algorithm ensures accurate measurement when the input signal power is greater than the internal noise value, effectively avoiding the measurement blind spot of traditional measurement chips in small signal situations.
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[ CXEP2350 ]"
CXEP2350 single-phase multifunctional energy metering chip: a complete solution for high-precision power and effective value measurement
In smart grids, industrial control, and energy management systems, high-precision energy metering is the core link for achieving energy efficiency monitoring and cost control. CXEP2350, as a multifunctional metering chip designed specifically for single-phase energy metering, integrates high-precision power measurement, effective value detection of current and voltage, and flexible output configuration functions, providing a complete and reliable solution for applications such as smart meters, charging stations, and smart sockets. This article will comprehensively analyze the technical characteristics, working principles, and system design points of CXEP2350, helping engineers quickly master the application of this high-performance metrology chip.
1、 Chip Overview and Market Positioning
CXEP2350 is a high-performance single-phase multifunctional metering chip that uses advanced&Sigma technology; -Δ Conversion technology and digital signal processing architecture can accurately measure active power, effective current value, and effective voltage value. The chip is equipped with a 3.579MHz high-precision oscillator and a 2.43V reference voltage source, which can achieve stable operation without the need for external clocks and reference components. Its unique anti static algorithm ensures accurate measurement when the input signal power is greater than the internal noise value, effectively avoiding the measurement blind spot of traditional measurement chips in small signal situations.
This chip is mainly aimed at applications that require precise measurement of electrical parameters, such as single-phase energy meters, smart sockets, charging stations, digital display instruments, street lamp control systems, and small household appliances. With its high integration and excellent performance, it has become an ideal choice in the field of energy metering.
2、 Core functional features
· High precision measurementImplement± within a dynamic range of 1000:1; 0.2% active power accuracy, meeting the IEC 687/1036 standard
· Dual pulse outputCF outputs active power, CF1 can be configured to output current or voltage effective value
· Wide Dynamic RangeThe accuracy of the effective current value is within the range of 500:1; 0.5%
· low-power design5V single power supply, typical working current is only 2.5mA
· Built in power monitoringAutomatically reset when voltage drops below 4V to ensure system reliability
· High anti-interference abilityPower supply voltage suppression ratio<0.01/V, voltage channel crosstalk suppression up to -100dB
· Complete integration solutionBuilt in oscillator, reference source, and signal conditioning circuit to reduce external components
· Compact packagingSOP8 packaging saves PCB space and is suitable for compact designs
3、 Pin function and system connection
CXEP2350 adopts standard SOP8 packaging, with clear and precise pin definitions:
· VDD (Pin 1)Positive pole of 5V power supply, to be used in conjunction with decoupling capacitor
· VIP/VIN (Pin 2/3)Current channel differential input, maximum input± 43.75mV
· V2P (pin 4)Voltage channel single ended input, maximum input± 700mV
· GND (pin 5): Power Ground
· CF (Pin 6)Active power high-frequency pulse output, with a duty cycle of 50%
· CF1 (Pin 7)Configurable effective value output, selecting current or voltage through SEL pin
· SEL (pin 8): Configure pins, built-in pull-down, used to select CF1 output content
In practical applications, current signals are usually sampled through manganese copper resistors, voltage signals are connected through a resistor voltage divider network, and CF and CF1 outputs are directly connected to the counter input of the main control MCU.
4、 Electrical characteristics and performance parameters
Under recommended working conditions (4.5V-5.5V, -40 ℃ to+85 ℃), CXEP2350 exhibits excellent metrological performance:
4.1. Simulation characteristics
· input characteristicsEquivalent input impedance of current channel 500kΩ Voltage channel 6MΩ
· Noise performanceCurrent channel input noise<2μ Vrms， Voltage channel<20μ Vrms
· Reference source2.43V-2.55V built-in reference, temperature drift 25ppm/℃
· power consumptionTypical power consumption 12.5mW@5V
4.2. Numerical characteristics
· clock systemMain clock 3.579MHz± 15%, duty cycle 30% -70%
· sampling rateInput sampling rate MCLK/4, output bitrate MCLK/128
· Filter characteristicsHigh pass filter with a transition frequency of 0.543Hz
· Interface electricalHigh level output VDD-0.5V@5mA Low level<0.5V
These parameters ensure that the chip can maintain stable and reliable metering performance even in harsh environments, meeting the strict requirements of various energy metering applications.
5、 Measurement principle and output frequency calculation
CXEP2350 adopts advanced digital signal processing technology and utilizesΣ -Δ The ADC performs high-precision sampling on the input signal, while the internal DSP completes power calculation and effective value calculation. The relationship between the output pulse frequency and the input signal is determined by the following formula:
5.1. Active power output frequency：
5.2. Effective current output frequency：
5.3. Effective voltage output frequency：
V1 and V2 are the effective input signals of the current and voltage channels, respectively. Fosc has an oscillation frequency of 3.579MHz, and VREF is a reference voltage of 2.43V.
6、 Typical Application Circuit Design
The typical application circuit of CXEP2350 is simple and efficient:
· Power supply designThe VDD pin needs to be connected in parallel with a 10 μ F electrolytic capacitor and a 100nF ceramic capacitor to filter out high and low frequency noise
· current samplingConvert the current into a differential voltage signal through a manganese copper resistor and directly connect it to VIP/VIN
· voltage samplingReduce the grid voltage proportionally through a resistive voltage divider network and connect it to the V2P pin
· output interfaceCF and CF1 outputs can directly drive GPIO of MCU without additional buffering
· Configure circuitThe SEL pin selects the CF1 output mode by pulling up or down through a resistor
Special attention should be paid to the layout of the analog part during design, keeping the signal path short, avoiding digital noise interference with the analog input, and ensuring measurement accuracy.
7、 Anti static algorithm and low power consumption characteristics
One of the core innovations of CXEP2350 is its unique anti static algorithm. Traditional measurement chips are prone to measurement errors or complete stops due to noise interference in small signals, while CXEP2350 uses intelligent noise recognition technology to accurately measure as long as the input signal power exceeds the internal noise threshold, effectively solving the measurement problem under light loads.
The power management of the chip is equally excellent:
· normal operationTypical current 2.5mA@5V Suitable for constant power supply equipment
· power monitoringBuilt in undervoltage lock, automatic reset for<4V, restore normal for>4.3V
· thermal designTypical power consumption of 12.5mW, no additional heat dissipation measures required
These features make CXEP2350 particularly suitable for battery powered or energy limited IoT devices.
8、 Detailed explanation of application scenarios
CXEP2350 is widely used in the following fields:
· smart electricity meterAs the core metering unit of single-phase smart meters, it provides accurate electricity consumption data
· charging pileEnergy metering for AC charging stations, supporting billing and management systems
· smart socketEmbedding smart sockets to achieve electricity monitoring and energy management
· industrial controlProvide power monitoring function for motor drive and power supply equipment
· small household appliancesPower monitoring and energy efficiency evaluation of high-end household appliances
Its high integration and flexibility enable system designers to quickly develop energy metering products that meet different market demands.
9、 Key points of packaging information and PCB design
CXEP2350 adopts the standard SOP8 package, with a size of 4.7× 5.1mm， The pin spacing is 1.27mm, suitable for automatic mounting and manual soldering. When designing PCB, attention should be paid to:
· Power decoupling capacitors should be placed as close as possible to the VDD and GND pins
· Simulate input signals far from digital output lines
· Using a complete ground plane to reduce noise interference
· The current sampling path uses differential routing and length matching
10、 Development support and system calibration
JTM-IC provides complete technical support for CXEP2350, including reference designs, application notes, and calibration guidelines. System calibration typically includes:
· Gain calibrationAdjusting measurement coefficients through standard sources
· Phase calibrationCompensate for phase error between current and voltage samples
· Offset calibrationEliminating output pulses at zero load
By simple three-point calibration, the system can achieve optimal measurement accuracy and meet relevant standard requirements.
11、 Conclusion
CXEP2350 has become the preferred solution in the field of single-phase energy metering due to its high precision, low power consumption, strong anti-interference, and unique anti static algorithm. Both traditional smart meters and emerging IoT energy monitoring devices can benefit from the excellent performance of this chip. Choosing CXEP2350 means choosing the perfect balance of high reliability, fast time to market, and excellent cost-effectiveness.
JTM-IC, as a professional integrated circuit supplier, is committed to providing customers with high-quality chips and comprehensive technical support. Welcome to the official websitejtm-ic.comGet detailed data manuals, sample requests, and reference design resources for CXEP2350 to help your energy metering project succeed quickly
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