ADE7953

Single Phase, Multifunction Metering IC with Neutral Current Measurement

Overview

Part: ADE7953, Analog Devices

Type: Single Phase, Multifunction Metering IC

Key Specs:

Active and Reactive Energy Error: < 0.1% over 3000:1 dynamic range
Instantaneous IRMS Error: < 0.2% over 1000:1 dynamic range
Bandwidth: 1.23 kHz
PGA Gain: Up to ×22
Supply Voltage: 3.3 V

Features:

Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards
Measures active, reactive, and apparent energy; sampled waveform; current and voltage rms
Provides a second current input for neutral current measurement
Provides apparent energy measurement and instantaneous power readings
Includes internal integrators for use with Rogowski coil sensors
SPI, I2C, or UART communication
Configurable low jitter pulse output pins proportional to active, reactive, or apparent energy, as well as current and voltage rms
Power quality information such as overcurrent, overvoltage, peak, and sag detection accessible via external IRQ pin
Independent active, reactive, and apparent no-load detections to prevent "meter creep"
Dedicated reverse power (REVP), zero-crossing voltage (ZX), and zero-crossing current (ZX_I) pins

Applications:

Single phase applications

Package:

28-lead LFCSP package: null

Features

Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053- 21, IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards
Measures active, reactive, and apparent energy; sampled waveform; current and voltage rms
Provides a second current input for neutral current measurement
Less than 0.1% error in active and reactive energy measurements over a dynamic range of 3000:1
Less than 0.2% error in instantaneous IRMS measurement over a dynamic range of 1000:1
Provides apparent energy measurement and instantaneous power readings
1.23 kHz bandwidth operation
Flexible PGA gain stage (up to ×22)

Includes internal integrators for use with Rogowski coil sensors SPI, I2C, or UART communication

GENERAL DESCRIPTION

The ADE7953 is a high accuracy electrical energy measurement IC intended for single phase applications. It measures line voltage and current and calculates active, reactive, and apparent energy, as well as instantaneous rms voltage and current.

The device incorporates three Σ-Δ ADCs with a high accuracy energy measurement core. The second input channel simultaneously measures neutral current and enables tamper detection and neutral current billing. The additional channel incorporates a complete signal path that allows a full range of measurements. Each input channel supports independent and flexible gain stages, making the device suitable for use with a variety of current sensors such as current transformers (CTs) and low value shunt resistors. Two on-chip integrators facilitate the use of Rogowski coil sensors.

The ADE7953 provides access to on-chip meter registers via a variety of communication interfaces including SPI, I2 C, and UART. Two configurable low jitter pulse output pins provide outputs that are proportional to active, reactive, or apparent energy, as well as current and voltage rms. A full range of power quality information such as overcurrent, overvoltage, peak, and sag detection are accessible via the external IRQ pin. Independent active, reactive, and apparent no-load detections are included to prevent "meter creep." Dedicated reverse power (REVP), zero-crossing voltage (ZX), and zero-crossing current (ZX_I) pins are also provided. The ADE7953 energy metering IC operates from a 3.3 V supply voltage and is available in a 28-lead LFCSP package.

Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

Pin Configuration

Figure 4. Pin Configuration

09320-004

Table 5. Pin Function Descriptions

Pin No.	Mnemonic	Description
1	ZX	Voltage Channel Zero-Crossing Output Pin. See the Voltage Channel Zero Crossing section. This pin can be configured to output a range of alternative power quality signals (see the Alternative Output Functions section).
2	RESET	Active Low Reset Input. To initiate a hardware reset,this pin must be brought low for at minimum of 10 μs.
3	VINTD	This pin provides access to the 2.5 V digital LDO. This pin should be decoupled with a 4.7 μF capacitor in parallel with a 100 nF ceramic capacitor.
4	DGND	Ground Reference for the Digital Circuitry.
5, 6	IAP, IAN	Analog Input for Current Channel A (Phase Current Channel). This differential voltage input has a maximum input range of ±500 mV. The maximum pin voltage for single-ended use is ±250 mV. The PGA associated with this input has a maximum gain stage of 22 (see the Analog Inputs section).
7, 8	PULL_HIGH	These pins should be connected to VDD for proper operation.
9, 10	IBP, IBN	Analog Input for Current Channel B (Neutral Current Channel). This differential voltage input has a maximum input range of ±500 mV. The PGA associated with this input has a maximum gain of 16 (see the Analog Inputs section).
11, 12	VN, VP	Analog Input for Voltage Channel. This differential voltage input has a maximum input range of ±500 mV. The PGA associated with this input has a maximum gain of 16 (see the Analog Inputs section).
13	REF	This pin provides access to the on-chip voltage reference. The internal reference has a nominal voltage of 1.2 V. This pin should be decoupled with a 4.7 μF capacitor in parallel with a 100 nF ceramic capacitor. Alternatively, an external reference voltage of 1.2 V can be applied to this pin (see the Reference Circuit section).
14	PULL_LOW	This pin should be connected to AGND for proper operation.
15	VINTA	This pin provides access to the 2.5 V analog LDO. This pin should be decoupled with a 4.7 μF capacitor in parallel with a 100 nF ceramic capacitor.
16	AGND	Ground Reference for the Analog Circuitry.
17	VDD	Power Supply (3.3 V) for the ADE7953. For specified operation,the input to this pin should be within 3.3 V ± 10%. This pin should be decoupled with a 10 μF capacitor in parallel with a 100 nF ceramic capacitor.
18	CLKIN	Master Clock Input for the ADE7953. An external clock can be provided at this input. Alternatively, a parallel resonant AT crystal can be connected across the CLKIN and CLKOUT pins to provide a clock source for the ADE7953. The clock frequency for specified operation is 3.58 MHz. Ceramic load capacitors of a few tens of picofarads should be used with the gate oscillator circuit. Refer to the crystal manufacturer's data sheet for the load capacitance requirements.
19	CLKOUT	A crystal can be connected across this pin and CLKIN to provide a clock source for the ADE7953.

Pin No.	Mnemonic	Description
20	REVP	Reverse Power Output Indicator. See the Reverse Power section. This pin can be configured to output a range of alternative power quality signals (see the Alternative Output Functions section).
21	ZX_I	Current Channel Zero-Crossing Output Pin. See the Current Channel Zero Crossing section. This pin can be configured to output a range of alternative power quality signals (see the Alternative Output Functions section).
22	IRQ	Interrupt Output. See the ADE7953 Interrupts section.
23	CF1	Calibration Frequency Output 1.
24	CF2	Calibration Frequency Output 2.
25	SCLK	Serial Clock Input for the Serial Peripheral Interface. All serial communications are synchronized to the clock (see the SPI Interface section). If using the I 2C interface, this pin must be pulled high. If using the UART interface, this pin must be pulled to ground.
26	MISO/SDA/Tx	Data Output for SPI Interface/Bidirectional Data Line for I 2C Interface/Transmit Line for UART Interface.
27	MOSI/SCL/Rx	Data Input for SPI Interface/Serial Clock Input for I 2C Interface/Receive Line for UART Interface.
28	CS	Chip Select for SPI Interface. This pin must be pulled high if using the I2C or UART interface.
	EPAD	Exposed Pad. Create a similar pad on the PCB under the exposed pad. Solder the exposed pad to the pad on the PCB to confer mechanical strength to the package. Connect the pad to AGND and DGND.

Absolute Maximum Ratings

TA = 25°C, unless otherwise noted.

Table 4.

Parameter	Rating
VDD to AGND	-0.3 V to +3.7 V
VDD to DGND	-0.3 V to +3.7 V
Analog Input Voltage to AGND, IAP, IAN, IBP, IBN, VP, VN	-2 V to +2 V
Reference Input Voltage to AGND	-0.3 V to VDD + 0.3 V
Digital Input Voltage to DGND	-0.3 V to VDD + 0.3 V
Digital Output Voltage to DGND	-0.3 V to VDD + 0.3 V
Operating Temperature
Industrial Range	-40°C to +85°C
Storage Temperature Range	-65°C to +150°C

Note that regarding the temperature profile used in soldering RoHS-compliant parts, Analog Devices, Inc., advises that reflow profiles should conform to J-STD 20 from JEDEC. Refer to the JEDEC website for the latest revision.

Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability.

ESD CAUTION

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
ADE795351	—	—
ADE7953ACPZ	—	—
ADE7953ACPZ-RL	—	—

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