MAXQ314+

MAXQ314+ Datasheet

MAXQ314

Part	Datasheet
MAXQ314+	MAXQ314+ (pdf)

Related Parts	Information
MAXQ314-KIT	MAXQ314-KIT

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MAXQ314 Single-Phase Power-Measurement IC with I2C Interface The MAXQ314 is a dedicated power-measurement IC that collects and calculates voltage, current, power, and power factor for a single-phase load. The results can be retrieved by an external master through the internal I2C bus. This bus is also used by the external master to configure the operation of the MAXQ314 and monitor the status of operations. The MAXQ314 performs voltage and current measurements using an integrated ADC that can measure voltage and current. Other values such as power are calculated from that data. The MAXQ314 also has an integrated temperature sensor that provides the die temperature on demand. The internal current amplifier produces up to 32x gain and the voltage amplifier gain is 1x. Single-Phase AC Power Monitoring PART MAXQ314+ OPERATING VOLTAGE V to +Denotes a lead Pb -free/RoHS-compliant package. EP = Exposed pad. S High-Performance, Low-Power DSP Core S On-Chip Digital Temperature Sensor S Precision Internal Voltage Reference S Active Power W , < Error S Reactive Power VAR , < Error S Apparent Power VA , < Error S Power Factor, < ±1% Error S Voltage RMS, < Error S Current RMS, < Error S I2C-Compatible Serial Interface S Continuous Output of IRMS in Serial or PWM Ordering Information TEMP RANGE -40NC to +85NC PIN-PACKAGE 20 TQFN-EP Block Diagram TEMP SENSOR MAXQ314 IL INTERNAL REFERENCE AVDD AGND DVDD DGND WATCHDOG TIMER 16-BIT MAXQ20 I2C INTERFACE SDA A0 A1 RISC CPU BUS POWER-ON RESET AVDD, DVDD SERIAL/PWM INTERNAL 8MHz CLOCK GENERATOR Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at MAXQ314 Single-Phase Power-Measurement IC with I2C Interface TABLE OF CONTENTS Absolute Maximum Ratings 4 Power-Monitoring Specifications 4 Electrical Characteristics 4 I2C Electrical Characteristics 5 I2C Bus Controller Timing 6 Pin Configuration 8 Pin Description 8 Detailed Description 9 Clock Source 9 Reset Sources 9 External Reset 9 Voltage Monitor 9 I2C Slave Operation 9 I2C Rate and Resets 10 I2C Slave Address Generation 10 I2C Protocol 10 Data and Control Registers 11 Calibration 14 Conversion to Physical Units 14 RMS Current Continuous Output AUX Pin 15 Applications Information 15 Grounds and Bypassing 15 Specific Design Considerations for MAXQ314-Based Systems 15 Additional Documentation 15 Development and Technical Support 16 Package Information 16 2 MAXQ314 Single-Phase Power-Measurement IC with I2C Interface LIST OF FIGURES Figure Series Resistors RS for Protecting Against High-Voltage Spikes 7 Figure I2C Bus Controller Timing Diagram 7 Figure Calibration Circuit Example 14 LIST OF TABLES Table Slave Address Determination 10 Table Register Set 12 Table DSPCFG Register Detail 13 Table Calibration Parameters 14 MAXQ314 Single-Phase Power-Measurement IC with I2C Interface ABSOLUTE MAXIMUM RATINGS Voltage Range on DVDD with Respect to +4.0V Voltage Range on AVDD with Respect to +4.0V Voltage Range on AGND with Respect to +0.3V Voltage Range on AVDD with Respect to +0.3V Voltage Range on Any Lead with Respect to DGND = to +4V Operating Temperature Range........................... -40NC to +85NC Storage Temperature Range........................... -65NC to +150NC Continuous Power Dissipation TA = +70NC 20-Pin TQFN derate 20.8mW/NC above +70NC .......1667mW ESD Protection Human Body Model ................................Q2kV Soldering Temperature.......................... Refer to the IPC/JEDEC J-STD-020 Specification. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. POWER-MONITORING SPECIFICATIONS VAVDD = VDVDD = 3.0V to 3.6V, TA = +25NC. Note 1 PARAMETER Active-Power Error Reactive-Power Error Apparent-Power Error Power-Factor Error RMS Voltage Error RMS Current Error CONDITIONS Current input DR 500:1 Current input DR 500:1 Current input DR 500:1 Current input DR 500:1 Current input DR 30:1 Current input DR 500:1 ELECTRICAL CHARACTERISTICS VAVDD = VDVDD = 3.0V to 3.6V, TA = +25NC, unless otherwise noted. Note 2 PARAMETER POWER SUPPLY Digital Supply Voltage Supply Current Analog Supply Voltage Supply Voltage Power-Fail Trip Point DIGITAL I/O Input High Voltage RST CONDITIONS VDVDD IDVDD VAVDD UVLO IDVDD + IAVDD, fCLK = 8MHz Rising, VDVDD = VAVDD Hysteresis Input High Voltage A0, A1, A2 VIH2 Input Low Voltage RST

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MAXQ314

Single-Phase Power-Measurement IC with I2C Interface

The MAXQ314 is a dedicated power-measurement IC that collects and calculates voltage, current, power, and power factor for a single-phase load. The results can be retrieved by an external master through the internal I2C bus. This bus is also used by the external master to configure the operation of the MAXQ314 and monitor the status of operations.

The MAXQ314 performs voltage and current measurements using an integrated ADC that can measure voltage and current. Other values such as power are calculated from that data. The MAXQ314 also has an integrated temperature sensor that provides the die temperature on demand. The internal current amplifier produces up to 32x gain and the voltage amplifier gain is 1x.

Single-Phase AC Power Monitoring

PART MAXQ314+

OPERATING VOLTAGE V to
+Denotes a lead Pb -free/RoHS-compliant package. *EP = Exposed pad.

S High-Performance, Low-Power DSP Core S On-Chip Digital Temperature Sensor S Precision Internal Voltage Reference S Active Power W , < Error S Reactive Power VAR , < Error S Apparent Power VA , < Error S Power Factor, < ±1% Error S Voltage RMS, < Error S Current RMS, < Error S I2C-Compatible Serial Interface S Continuous Output of IRMS in Serial or PWM
Ordering Information

TEMP RANGE -40NC to +85NC

PIN-PACKAGE 20 TQFN-EP*

Block Diagram

TEMP SENSOR

MAXQ314

IL INTERNAL REFERENCE

AVDD AGND DVDD DGND

WATCHDOG TIMER
16-BIT MAXQ20

I2C INTERFACE

SDA A0 A1

RISC CPU BUS

POWER-ON RESET

AVDD, DVDD

SERIAL/PWM

INTERNAL
8MHz CLOCK

GENERATOR

Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at

MAXQ314

Single-Phase Power-Measurement IC with I2C Interface

TABLE OF CONTENTS

Absolute Maximum Ratings 4 Power-Monitoring Specifications 4 Electrical Characteristics 4 I2C Electrical Characteristics 5 I2C Bus Controller Timing 6 Pin Configuration 8 Pin Description 8 Detailed Description 9

Clock Source 9 Reset Sources 9

External Reset 9 Voltage Monitor 9 I2C Slave Operation 9 I2C Rate and Resets 10 I2C Slave Address Generation 10 I2C Protocol 10 Data and Control Registers 11 Calibration 14 Conversion to Physical Units 14 RMS Current Continuous Output AUX Pin 15 Applications Information 15 Grounds and Bypassing 15 Specific Design Considerations for MAXQ314-Based Systems 15 Additional Documentation 15 Development and Technical Support 16 Package Information 16
2

MAXQ314

Single-Phase Power-Measurement IC with I2C Interface

LIST OF FIGURES

Figure Series Resistors RS for Protecting Against High-Voltage Spikes 7 Figure I2C Bus Controller Timing Diagram 7 Figure Calibration Circuit Example 14

LIST OF TABLES

Table Slave Address Determination 10 Table Register Set 12 Table DSPCFG Register Detail 13 Table Calibration Parameters 14

MAXQ314

Single-Phase Power-Measurement IC with I2C Interface

ABSOLUTE MAXIMUM RATINGS

Voltage Range on DVDD with Respect to +4.0V

Voltage Range on AVDD with Respect to +4.0V

Voltage Range on AGND with Respect to +0.3V

Voltage Range on AVDD with Respect to +0.3V

Voltage Range on Any Lead with Respect to DGND = to +4V

Operating Temperature Range........................... -40NC to +85NC Storage Temperature Range........................... -65NC to +150NC Continuous Power Dissipation TA = +70NC
20-Pin TQFN derate 20.8mW/NC above +70NC .......1667mW ESD Protection Human Body Model ................................Q2kV Soldering Temperature.......................... Refer to the IPC/JEDEC

J-STD-020 Specification.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

POWER-MONITORING SPECIFICATIONS

VAVDD = VDVDD = 3.0V to 3.6V, TA = +25NC. Note 1

PARAMETER Active-Power Error Reactive-Power Error Apparent-Power Error Power-Factor Error RMS Voltage Error RMS Current Error

CONDITIONS Current input DR 500:1 Current input DR 500:1 Current input DR 500:1 Current input DR 500:1 Current input DR 30:1 Current input DR 500:1

ELECTRICAL CHARACTERISTICS

VAVDD = VDVDD = 3.0V to 3.6V, TA = +25NC, unless otherwise noted. Note 2

PARAMETER POWER SUPPLY Digital Supply Voltage Supply Current Analog Supply Voltage Supply Voltage Power-Fail Trip Point DIGITAL I/O Input High Voltage RST

CONDITIONS

VDVDD IDVDD VAVDD

UVLO

IDVDD + IAVDD, fCLK = 8MHz

Rising, VDVDD = VAVDD Hysteresis

Input High Voltage A0, A1, A2

VIH2

Input Low Voltage RST

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Datasheet ID: MAXQ314+ 647457