MAXQ314 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Single-Phase Power-Measurement IC with I2C Interface

19-5031; Rev 0; 11/09
EVAALVUAAILTAIOBNLEKIT
Single-Phase Power-Measurement
IC with I²C Interface
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
PART
MAXQ314+
OPERATING VOLTAGE (V)
3.0 to 3.6
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Features
S High-Performance, Low-Power DSP Core
S On-Chip Digital Temperature Sensor
S Precision Internal Voltage Reference
S Active Power (W), < ±0.5% Error
S Reactive Power (VAR), < ±0.7% Error
S Apparent Power (VA), < ±0.7% Error
S Power Factor, < ±1% Error
S Voltage RMS, < ±0.2% Error
S Current RMS, < ±0.5% 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
VP
MUX
PGA
ADC
VN
IL
INTERNAL
REFERENCE
AVDD
AGND
DVDD
DGND
WATCHDOG
TIMER
16-BIT
MAXQ20
SCL
I²C
INTERFACE
SDA
A0
A1
A2
RISC CPU
BUS
DSP
POWER-ON
RESET
(AVDD, DVDD)
SERIAL/PWM
AUX
INTERNAL
8MHz CLOCK
RST
GENERATOR
MAXQ is a registered trademark of Maxim Integrated Products, Inc.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, go to: www.maxim-ic.com/errata.
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.