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PDF MAXQ314 Data sheet ( Hoja de datos )
| Número de pieza | MAXQ314 | |
| Descripción | Single-Phase Power-Measurement IC | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAXQ314 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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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
TEMP RANGE
-40NC to +85NC
Ordering Information
PIN-PACKAGE
20 TQFN-EP*
Block Diagram
www.DataSheet4U.com
VP
VN
IL
AVDD
AGND
DVDD
DGND
TEMP SENSOR
MUX
WATCHDOG
TIMER
16-BIT
MAXQ20
RISC CPU
POWER-ON
RESET
(AVDD, DVDD)
MAXQ314
PGA ADC
INTERNAL
REFERENCE
I2C
INTERFACE
BUS DSP
SERIAL/PWM
INTERNAL
8MHz CLOCK
GENERATOR
SCL
SDA
A0
A1
A2
AUX
RST
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.
________________________________________________________________ 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 www.maxim-ic.com.
1 page  
Single-Phase Power-Measurement
IC with I2C Interface
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD = VDVDD = 3.0V to 3.6V, TA = +25NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Output Low Voltage (AUX)
Input Leakage (A0, A1, A2)
VOL IOL = 6mA
IL
Input Capacitance (RST, A0,
A1, A2)
CIN
RST Pullup Resistance
RRST
INTERNAL OSCILLATOR
Oscillator Frequency
fSCLK
AFE AND ANALOG-TO-DIGITAL CONVERTER
Voltage Range (VP)
Voltage Range (VN)
Slow Current Channel (IL)
Input Capacitance Single-Ended
ADC Sampling Rate
Per channel
INTERNAL VOLTAGE REFERENCE
Reference Accuracy
TA = -40NC to +85NC
TEMPERATURE SENSOR
Temperature Accuracy
TEP = -40NC to +85NC
MIN TYP MAX UNITS
0.4 V
-12 +12 FA
10 pF
50 150 200 kI
7.2 8 8.8 MHz
0 1.5 V
0 1.5 V
0 1.5 V
10 pF
5 ksps
1.8 2.07 2.3
V
3 NC
I2C ELECTRICAL CHARACTERISTICS
(VAVDD = VDVDD = 3.0V to 3.6V, TA = -40NC to +85NC.) (Note 2)
PARAMETER
Input Low Voltage
www.DatIanSphuet eHt4igUh.cVoomltage
Input Hysteresis (Schmitt)
Output Logic-Low (Open Drain
or Open Collector)
Input Current on I/O
I/O Capacitance
SYMBOL
VIL_I2C
VIH_I2C
VIHYS_I2C
CONDITIONS
VDVDD > 2V (Note 1)
VOL_I2C VDVDD > 2V, 6mA sink current
IIN_I2C
CIO_I2C
Input voltage from 0.1 x VDVDD to 0.9 x
VDVDD
(Note 1)
MIN
0.7 x VDVDD
0.05 x VDVDD
MAX
0.3 x VDVDD
0 0.4
-10 +10
10
UNITS
V
V
V
V
FA
pF
_______________________________________________________________________________________ 5
5 Page 
Single-Phase Power-Measurement
IC with I2C Interface
Data and Control Registers
All transactions consist of the master writing to or read-
ing from data, configuration, or control registers. Each
register has an 8-bit address. There are several catego-
ries of internal registers; read-only registers return mea-
surement values taken by the device. All the read/write
registers are calculation coefficients set by the master.
The only exceptions are the DSPCFG register, which
configures operating features of the device, and the
ADC_AZ register, which resets the internal ADC when it
is written to.
READ WORD
S ADDR:7 W A CMD:8 A SR ADDR:7 R A D0:8 A D1:8 N P
READ LONG
S ADDR:7 W A CMD:8 A SR ADDR:7 R A D0:8 A D1:8 A D2:8 N P
WRITE WORD
S ADDR:7 W A CMD:8 A D0:8 A D1:8 A P
READ WORD WITH PEC
S ADDR:7 W A CMD:8 A SR ADDR:7 R A D0:8 A D1:8 A
PEC:8
NP
READ LONG WITH PEC
S ADDR:7 W A CMD:8 A SR ADDR:7 R A D0:8 A D1:8 A D2:8 A
PEC:8
NP
WRITE WORD WITH PEC
S ADDR:7 W A CMD:8 A D0:8 A D1:8 A
PEC:8
AP
www.DataShAee=t4AUC.cKoNmOWLEDGE (ACK) BIT
ADDR:7 = 7-BIT DEVICE ADDRESS; MUST MATCH THE ADDRESS SELECTED BY A[2:0]
CMD:8 = REGISTER/COMMAND SELECTED IN TABLE 2
D0:8 = 8-BIT DATA; MULTIBYTE COMMANDS CAN REQUIRE D0, D1, D2, ETC.
PEC:8 = 8-BIT PEC DATA
N = NEGATIVE ACKNOWLEDGE (NACK) BIT
P = STOP BIT
S = START BIT
SR = REPEATED START BIT
W = WRITE BIT
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAXQ314.PDF ] | |
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