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MAXQ314+
Single-Phase Power-Measurement IC with I²C Interface
Single-Phase Power-Measurement
IC with I2C Interface
MAXQ314
19-5031; Rev 0; 11/09
Ordering Information
General Description
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 measure-
ments 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.
Applications
Single-Phase AC Power Monitoring
FeaturesHigh-Performance, Low-Power DSP CoreOn-Chip Digital Temperature SensorPrecision Internal Voltage ReferenceActive Power (W), < ±0.5% ErrorReactive Power (VAR), < ±0.7% ErrorApparent Power (VA), < ±0.7% ErrorPower Factor, < ±1% ErrorVoltage RMS, < ±0.2% ErrorCurrent RMS, < ±0.5% ErrorI2C-Compatible Serial InterfaceContinuous Output of IRMS in Serial or PWM
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
MAXQ is a registered trademark of Maxim Integrated Products, Inc.
Block Diagram
EVALUATION KIT
AVAILABLE
PARTOPERATING VOLTAGE (V)TEMP RANGEPIN-PACKAGE
MAXQ314+3.0 to 3.6-40NC to +85NC20 TQFN-EP*
MAXQ314
SCL
SDA
AUX
RST
AVDD
AGND
DVDD
DGND
MUXPGAADC
DSP
WATCHDOG
TIMER
INTERNAL
REFERENCE
I2C
INTERFACE
SERIAL/PWM
16-BIT
MAXQ20
RISC CPU
INTERNAL
8MHz CLOCK
GENERATOR
POWER-ON
RESET
(AVDD, DVDD)
BUS
TEMP SENSOR
Single-Phase Power-Measurement
IC with I2C Interface
MAXQ314
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
Single-Phase Power-Measurement
IC with I2C Interface
MAXQ314
LIST OF FIGURES
Figure 1. Series Resistors (RS) for Protecting Against High-Voltage Spikes .................................7
Figure 2. I2C Bus Controller Timing Diagram.........................................................7
Figure 3. Calibration Circuit Example..............................................................14
LIST OF TABLES
Table 1. Slave Address Determination.............................................................10
Table 2. Register Set ..........................................................................12
Table 3. DSPCFG Register Detail.................................................................13
Table 4. Calibration Parameters..................................................................14
Single-Phase Power-Measurement
IC with I2C Interface
MAXQ314
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.
Voltage Range on DVDD with
Respect to DGND .............................................-0.3V to +4.0V
Voltage Range on AVDD with
Respect to AGND .............................................-0.3V to +4.0V
Voltage Range on AGND with
Respect to DGND .............................................-0.3V to +0.3V
Voltage Range on AVDD with
Respect to DVDD ..............................................-0.3V to +0.3V
Voltage Range on Any Lead with
Respect to (DGND = AGND) ...............................-0.3V 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.
POWER-MONITORING SPECIFICATIONS
(VAVDD = VDVDD = 3.0V to 3.6V, TA = +25NC.) (Note 1)
ELECTRICAL CHARACTERISTICS
(VAVDD = VDVDD = 3.0V to 3.6V, TA = +25NC, unless otherwise noted.) (Note 2)
ABSOLUTE MAXIMUM RATINGS
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER SUPPLY
Digital Supply VoltageVDVDD3.03.6V
Supply CurrentIDVDDIDVDD + IAVDD, fCLK = 8MHz6.515.0mA
Analog Supply VoltageVAVDD3.03.6V
Supply Voltage Power-Fail Trip
PointUVLORising, VDVDD = VAVDD2.752.82.95V
Hysteresis100mV
DIGITAL I/O
Input High Voltage (RST)VIH2.1V
Input High Voltage (A0, A1, A2)VIH2VDVDD
- 0.3V
Input Low Voltage (RST)VIL0.8V
Input Low Voltage (A0, A1, A2)VIL20.3V
PARAMETERCONDITIONSMINTYPMAXUNITS
Active-Power ErrorCurrent input DR 500:10.5%
Reactive-Power ErrorCurrent input DR 500:10.7%
Apparent-Power ErrorCurrent input DR 500:10.7%
Power-Factor ErrorCurrent input DR 500:10.1%
RMS Voltage ErrorCurrent input DR 30:10.2%
RMS Current ErrorCurrent input DR 500:10.5%
Single-Phase Power-Measurement
IC with I2C Interface
MAXQ314
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD = VDVDD = 3.0V to 3.6V, TA = +25NC, unless otherwise noted.) (Note 2)
I2C ELECTRICAL CHARACTERISTICS
(VAVDD = VDVDD = 3.0V to 3.6V, TA = -40NC to +85NC.) (Note 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Output Low Voltage (AUX)VOLIOL = 6mA0.4V
Input Leakage (A0, A1, A2)IL-12+12FA
Input Capacitance (RST, A0,
A1, A2)CIN10pF
RST Pullup ResistanceRRST50150200kI
INTERNAL OSCILLATOR
Oscillator FrequencyfSCLK7.288.8MHz
AFE AND ANALOG-TO-DIGITAL CONVERTER
Voltage Range (VP)01.5V
Voltage Range (VN)01.5V
Slow Current Channel (IL)01.5V
Input Capacitance Single-Ended10pF
ADC Sampling RatePer channel5ksps
INTERNAL VOLTAGE REFERENCE
Reference AccuracyTA = -40NC to +85NC1.82.072.3V
TEMPERATURE SENSOR
Temperature AccuracyTEP = -40NC to +85NC3NC
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
Input Low VoltageVIL_I2C0.3 x VDVDDV
Input High VoltageVIH_I2C0.7 x VDVDDV
Input Hysteresis (Schmitt)VIHYS_I2CVDVDD > 2V (Note 1)0.05 x VDVDDV
Output Logic-Low (Open Drain
or Open Collector)VOL_I2CVDVDD > 2V, 6mA sink current00.4V
Input Current on I/OIIN_I2CInput voltage from 0.1 x VDVDD to 0.9 x
VDVDD-10+10FA
I/O CapacitanceCIO_I2C(Note 1)10pF
Single-Phase Power-Measurement
IC with I2C Interface
MAXQ314
I2C BUS CONTROLLER TIMING
(VDVDD = 3.0V to 3.6V, TA = +25NC, unless otherwise noted. Typical values are at VDVDD = 3.3V, TA = +25NC.) (Note 1, Figure 2)
Note 1: Specifications guaranteed, but not production tested.
Note 2: All parameters tested at TA = +25NC. Specifications over temperature are guaranteed by design.
Note 3: A master device must provide a hold time of at least 300ns for the SDA signal (referred to VIL of the SCL signal) to bridge
the undefined region of SCL’s falling edge.
Note 4: ISINK P 6mA. tR_I2C and tF_I2C measured between 0.3 x VDVDD and 0.7 x VDVDD.
Note 5: CB = Total capacitance of one bus line in pF.
Note 6: Guaranteed by design. Input filters on the SDA and SCL pins suppress noise spikes less than 50ns.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Serial Clock FrequencyfSCL400kHz
Bus Free Time Between a STOP
and a START Condition tBUF1.3Fs
Hold Time (Repeated) START
ConditiontHD:STA0.6Fs
Repeated START Condition
Setup TimetSU:STA0.6Fs
STOP Condition Setup TimetSU:STO0.6Fs
Data Hold TimetHD:DAT(Note 3)0.9Fs
Data Setup TimetSU:DAT120ns
SCL Clock Low PeriodtLOW1.3Fs
SCL Clock High PeriodtHIGH0.6Fs
Rise Time of Both SDA and SCL
Signals ReceivingtR_I2C(Notes 4, 5)20 +
0.1CB300ns
Fall Time of Both SDA and SCL
Signals ReceivingtF_I2C(Notes 4, 5)20 +
0.1CB300ns
Fall Time of SDA TransmittingtF_TX(Notes 4, 5)20 +
0.1CB250ns
Pulse Width of Spike SuppressedtSP(Note 6)50ns
Capacitive Load for Each Bus
LineCB(Note 5)400pF
Single-Phase Power-Measurement
IC with I2C Interface
MAXQ314
Figure 1. Series Resistors (RS) for Protecting Against High-Voltage Spikes
Figure 2. I2C Bus Controller Timing Diagram
SDA
SCLRS
I2C
DEVICERS
I2C
DEVICERP
VDVDD
MAXQ314
SDA
SCLSRPS
tF_I2CtR_I2C
tLOW
tHIGHtHD:STA
tSU:DATtSU:STA
tSU:STO
tBUF
tHD:DAT
Single-Phase Power-Measurement
IC with I2C Interface
MAXQ314
Pin Configuration
Pin Description
MAXQ314
TQFN
(5mm × 5mm)TOP VIEWEP*
*EXPOSED PAD.
N.C.
DVDD
N.C.
AUX
REFA0A1VN2
AGND5141211
N.C.
N.C.
SDA
SCL
N.C.
DGND
RST
AVDD10A2VP
PINNAMEFUNCTION
POWER PINSDGNDDigital Ground. AGND and DGND should be connected externally through a single point connection.DVDDDigital Supply Voltage. Connect AVDD to DVDD externally. Connect a 0.1FF capacitor to DGND.REFBuffered Reference Output. Connect this pin to AGND through a 1FF capacitor. No other signals should be
connected to this pin. AVDDAnalog Supply Voltage. Connect AVDD to DVDD externally. Connect a 0.1FF capacitor to AGND.AGNDAnalog Ground. AGND and DGND should be connected externally through a single point connection.EPExposed Pad. Connect to AGND.
COMMUNICATION AND CONTROL PINSAUXRMS Current Continuous Output. This open-drain pin continuously outputs the value of the most recent 16-bit
RMS current measurement. If the SPCFG.PWMOUT bit is set, the value is instead output in PWM format. SCLI2C Clock Line I/OSDAI2C Data Line I/OA2
Device Selection Address Bits, Input. These bits select the slave address shown in Table 1.11A1A0RSTActive-Low Reset Input. The CPU is held in reset when this pin is low. The pin includes pullup current
source and should be driven by an open-drain external source capable of sinking in excess of 4mA.
