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NXP Semiconductors EM783-SPE
- Part No.:
- EM783-SPE
- Manufacturer:
- NXP Semiconductors
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VQFN Exposed Pad
- Datasheet:
-
EM783-SPE.pdf
- Description:
- MCU 32BIT ENERGY METER 32HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,065
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Product details
Overview
EM783-SPE from NXP Semiconductors is an energy measurement application processor integrating a metrology engine, ARM Cortex-M0 core (48 MHz), 32 kB flash, 8 kB SRAM, and 4 kB EEPROM for calibration storage. It delivers 1% accuracy over 1,000:1 dynamic range and supports single-phase residential metering with power-line frequency tracking and on-chip temperature sensing (±3 °C).
For engineers reviewing the EM783-SPE datasheet, EM783-SPE pinout, EM783-SPE application, or EM783-SPE equivalent, key selection criteria include metrology accuracy at 1%, configurable uptime for measurement periods, support for single-phase configurations, UART/SPI/I²C peripherals, and HVQFN-33 package compatibility in smart plug and residential meter designs.
Technical Context
The EM783-SPE implements a dedicated metrology engine that computes real-time W, VAr, VA, power factor, Vrms, Irms, THD, and line frequency-compensating for temperature drift using its integrated ±3 °C sensor. It operates across 45–65 Hz line frequencies and scales to 120/230 V inputs.
Its ARM Cortex-M0 core executes open-source kWh generation firmware via a documented API for initialization, data capture, and control. Memory architecture includes 32 kB flash for application code, 8 kB SRAM for runtime variables, and 4 kB EEPROM for persistent calibration and energy logs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Metrology Accuracy | 1% error over full operating range-meets IEC 62053-21 Class B requirements for billing-grade single-phase meters. |
| Dynamic Range | 1,000:1 below max current load-enables accurate low-load measurement down to 0.1% of Imax without range switching. |
| CPU Core | ARM Cortex-M0 up to 48 MHz-provides deterministic real-time execution for metrology calculations and host communication stacks. |
| Memory | 32 kB flash / 8 kB SRAM / 4 kB EEPROM-supports firmware updates, runtime buffers, and non-volatile calibration storage without external memory. |
| Peripherals | UART, SPI, I²C, GPIO, counter/timer, watchdog-enables direct interface to RS485/IrDA transceivers, LCDs, and external sensors. |
| Temperature Sensor | On-die ±3 °C accuracy-used for real-time thermal compensation of metrology gain/offset errors in varying ambient conditions. |
| Power-Line Tracking | 45–65 Hz detection and continuous frequency tracking-maintains synchronization for precise cycle-based sampling and harmonic analysis. |
Pinout & Package
EM783-SPE is housed in a 33-pin HVQFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per variant configuration; the SP variant uses dedicated analog inputs for two current channels and one voltage channel, plus digital I/O for UART/SPI/I²C and system control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA, VSSA | Analog Power Supply/Ground | Isolated analog domain for metrology ADC reference stability; requires separate filtering from digital supply. |
| IA+, IA−, IB+, IB−, VA | Current/Voltage Analog Inputs | Dedicated differential current sense inputs (IA/IB) and single-ended voltage input (VA) for single-phase 2I+1V topology. |
| XTAL1, XTAL2 | Crystal Oscillator Interface | Supports 1–20 MHz crystal for precise timing of metrology sampling clock and CPU operation. |
| PA0–PA7, PB0–PB7, PC0–PC7 | Configurable GPIO | Up to 22 usable pins depending on peripheral enable state; supports UART TX/RX, SPI SCK/MOSI/MISO, I²C SCL/SDA. |
| RESET | Active-Low Reset Input | Asynchronous reset signal compatible with external supervisor ICs or manual reset buttons. |
Key Features
| Feature | Design Value |
|---|---|
| 1% metrology accuracy | Validated under IEC 62053-21 test conditions-enables Class B compliance without external calibration hardware. |
| 1,000:1 dynamic range | Supports accurate sub-meter-level consumption reporting (e.g., standby loads) without auto-ranging circuitry. |
| Configurable uptime | Measurement window duration programmable in firmware-allows trade-off between data granularity and EEPROM write endurance. |
| Built-in temperature sensor (±3 °C) | Enables on-the-fly gain/offset correction of metrology path-reduces need for external thermal sensors or factory recalibration. |
| Open-source kWh application + API | Reduces firmware development time by providing validated metering logic and standardized register access for start/stop/read operations. |
Applications
| Smart Plugs and Plug Meters | Single-Phase Residential Meters |
|---|---|
Use Scenario: Compact AC-powered smart outlet measuring real-time energy consumption and cost-per-kWh for consumer IoT platforms. IC Role / Device Role / Timing Role: Primary metrology processor handling analog front-end digitization, RMS/power calculation, and kWh accumulation with local display or BLE/Wi-Fi gateway interface. Use Value: 1% accuracy and 1,000:1 dynamic range ensure reliable billing-level readings even during ultra-low standby loads (<1 W). | Use Scenario: ANSI C12.20 or IEC 62053-21 compliant electricity meter for apartment or small commercial installations. IC Role / Device Role / Timing Role: Single-phase application processor executing metrology engine, tariff management, and secure data logging in tamper-resistant enclosure. Use Value: Integrated EEPROM stores calibration constants and energy logs-eliminates external non-volatile memory and reduces BOM count. |
| DALI/KNX Nodes with Metering | Industrial Sub-Meters |
Use Scenario: Lighting control node (DALI/KNX) requiring embedded energy monitoring per luminaire group or zone. IC Role / Device Role / Timing Role: Local energy aggregator computing per-circuit consumption and feeding aggregated data to building management system via DALI or KNX TP. Use Value: UART and I²C interfaces allow direct connection to DALI transceivers and KNX transceivers-no additional protocol bridge IC required. | Use Scenario: Panel-mounted sub-meter for HVAC, UPS, or server rack monitoring in industrial facilities. IC Role / Device Role / Timing Role: Standalone energy monitor capturing Vrms, Irms, THD, and power factor for predictive maintenance and load balancing. Use Value: On-chip temperature sensor enables thermal derating of measured current values-improves long-term reliability under high-ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar energy measurement application processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EM783-SP | Same metrology engine, identical 1% accuracy and 1,000:1 dynamic range; differs only in factory-programmed variant ID and default firmware configuration. | Pre-configured for single-phase 2I+1V topology with fixed memory map; no runtime reconfiguration of channel count. | Select EM783-SP when production volume justifies variant-specific firmware and simplified qualification. |
| ATTINY1616-MFR | No integrated metrology engine; requires external ADC, shunt/sensor interface, and custom firmware for power calculations-accuracy limited by external component tolerance. | Suitable for non-billing applications where <5% accuracy suffices and cost sensitivity outweighs metrology integration. | Choose ATTINY1616-MFR only for prototyping or low-cost sub-metering where Class B compliance is not required. |
Compared with EM783-SP, the EM783-SPE offers identical metrology performance but supports runtime configuration of uptime and peripheral mapping-ideal for design flexibility across multiple smart plug SKUs. Versus ATTINY1616-MFR, EM783-SPE eliminates external metrology components and validation effort while delivering certified 1% accuracy out-of-box.
Availability
EM783-SPE is available at Aetrix Electronics and suitable for smart plugs and plug meters, single-phase residential meters, and industrial sub-meters requiring stable component supply, long-term lifecycle support, and metrology-grade accuracy.
Supply support for EM783-SPE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The EM783 family is part of NXP's energy measurement portfolio, designed specifically for cost-sensitive, high-accuracy single- and multi-phase metering applications requiring integrated metrology, ARM-based processing, and minimal external components.
FAQ
What is the metrology accuracy specification for EM783-SPE under IEC 62053-21?
The EM783-SPE achieves 1% accuracy under IEC 62053-21 Class B test conditions-including specified voltage/current ranges, temperature gradients, and harmonic content. This accuracy is maintained across its full 1,000:1 dynamic range and verified using NXP's reference test setup with calibrated sources. The EM783-SPE does not require external trimming to meet this specification.
Does EM783-SPE support three-phase energy measurement?
No, EM783-SPE is configured exclusively for single-phase applications with two current inputs (IA, IB) and one voltage input (VA). Three-phase functionality is implemented in the EM783-TP variant, which provides three current and three voltage inputs and accepts different firmware. Using EM783-SPE for three-phase measurement would require external signal conditioning and is not supported by its metrology engine.
How is calibration data stored and managed in EM783-SPE?
Calibration parameters-including gain, offset, phase compensation, and temperature coefficients-are stored in the on-chip 4 kB EEPROM. The EM783-SPE firmware supports read/write access via its documented API, enabling field calibration updates without flash reprogramming. EEPROM endurance exceeds 100,000 write cycles, supporting lifetime logging of energy consumption and periodic recalibration events in the EM783-SPE.
What communication interfaces are available on EM783-SPE for host microcontroller or cloud gateway integration?
The EM783-SPE integrates UART, SPI, and I²C peripherals with configurable GPIO mapping. UART supports RS485 and IrDA physical layers for long-distance or optical communication; SPI and I²C enable direct connection to MCU hosts or sensor hubs. All interfaces are accessible through the 33-pin HVQFN package and controlled via the EM783-SPE's open-source API without requiring additional protocol translation hardware.
Can EM783-SPE operate without an external crystal oscillator?
No, EM783-SPE requires an external crystal (1–20 MHz) connected to XTAL1/XTAL2 pins for stable metrology sampling and CPU timing. Its internal RC oscillator lacks the precision needed for 1% accuracy over temperature and line frequency variation. The crystal ensures consistent 128× oversampling of analog inputs and tight synchronization with power-line zero-crossing detection-both critical for EM783-SPE metrology integrity.
EM783-SPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-VQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Applications:
- Energy Measurement
- Core Processor:
- ARM® Cortex®-M0
- Program Memory Type:
- FLASH (32kB)
- Controller Series:
- -
- RAM Size:
- 8K x 8
- Interface:
- I2C, IrDA, SPI, UART/USART
- Number of I/O:
- 22
- Voltage - Supply:
- 2.6V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-HVQFN (7x7)
EM783-SPE FAQ
1.How can I place an order for EM783-SPE through Aetrix?
Please submit a Request for Quotation (RFQ) for EM783-SPE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for EM783-SPE reliable?
The price and inventory of EM783-SPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EM783-SPE is usually 5 days.
3.What payment methods are accepted for EM783-SPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EM783-SPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EM783-SPE?
EM783-SPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EM783-SPE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for EM783-SPE?
For technical support, including EM783-SPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EM783-SPE requirements.
6.How does Aetrix verify that EM783-SPE is sourced from the original manufacturer or authorized distributors?
All EM783-SPE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that EM783-SPE meets industry standards.
7.What is the process for return or replacement of EM783-SPE?
All EM783-SPE units undergo pre-shipment inspection (PSI). If there is an issue with EM783-SPE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The EM783-SPE part is unused and in its original packaging.
Return procedure for EM783-SPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
EM783-SPE Tags
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