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PDF 78M6613 Data sheet ( Hoja de datos )
| Número de pieza | 78M6613 | |
| Descripción | Single-Phase AC Power Measurement IC | |
| Fabricantes | Teridian Semiconductor | |
| Logotipo |  |
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A Maxim Integrated Products Brand
DS_6613_018
DESCRIPTION
The 78M6613 is a highly integrated IC for simplified
implementation of single-phase AC power measurement
into power supplies, smart appliances, and ot her
applications with embedded AC load monitoring and
control. It is packaged in a small, 5mm x 5mm, 32-pin QFN
package for optimal space savings.
At the measurement interface, the device provides four
analog inputs for interfacing to voltage and current sensors.
Voltages from the sensors are fed to our Single Converter
Technology® that uses a 22-bit delta-sigma ADC,
independent 32-bit compute engine (CE), digital
temperature compensation, and precision voltage
references to provide better than 0.5% power measurement
accuracy over a wide 2000:1 dynamic range.
The integrated MPU core and 32 KB of flash memory
provides a flexible means of configuration, post-processing,
data formatting, and interfacing to any host processor
through the UART interface and/or DIO pins. Complete
application firmware is available and can be preloaded into
the IC during manufacturing test. Alternatively, a complete
array of ICE, development tools, and programming libraries
are available to allow customization for each application.
LIVE
NEUT
Earth Ground
Isolated Supply
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32 kHz
CONVERTER
A0
A1
A2
A3
VOLTAGE REF
VREF
TEMP
SENSOR
OSC/PLL
XIN
XOUT
V3P3
TERIDIAN
78M6613
2KB RAM
32KB
FLASH
32-bit
COMPUTE
ENGINE
80515
MPU
TIMERS
GND
REGULATOR
DIO, PULSE
DIO 4-8
DIO 14-17, 19
SERIAL PORT
TX
RX
ICE
ICE_E
Single Converter Technology is a registered trademark of Maxim
Integrated Products, Inc.
V3P3
GND
19-5348; Rev 3/11
78M6613
Single-Phase
AC Power Measurement IC
DATA SHEET
March 2011
FEATURES
• < 0.5% Wh Accuracy Over Wide 2000:1
Current Range and Over Temperature
• Voltage Reference < 40ppm/°C
• Four Sensor Inputs—V3P3A Referenced
• 22-Bit Delta-Sigma ADC with Independent
32-Bit Compute Engine (CE)
• 8-Bit MPU (80515), One Clock Cycle per
Instruction with 2KB MPU XRAM
• 32KB Flash with Security
• Integrated In-Circuit Emulator (ICE) Interface
for MPU Debug
• 32kHz Time Base with Hardware Watchdog
Timer
• UART Interface and Up to 10 General-
Purpose 5V Tolerant I/O Pins
• Packaged in a RoHS-Compliant (6/6)
Lead(Pb)-Free, 32-Pin QFN (5mm x 5mm)
• Complete Application Firmware Provides:
o True RMS Calculations for Current,
Voltage, Line Frequency, Real Power,
Reactive Power, Apparent Power, and
Power Factor
o Accumulated Watt-Hours, Kilowatt-Hours
o Intelligent Switch Control at Zero
Crossings
o Digital Temperature Compensation
o Phase Compensation (±15°)
o Quick Calibration Routines
o 46–64Hz Line Frequency Range with
Same Calibration
Rev. 1.1
© 2011 Teridian Semiconductor Corporation
1
1 page  
DS_6613_018
78M6613 Data Sheet
1 Hardware Description
1.1 Hardware Overview
The Teridian 78M6613 single-chip measurement unit integrates all primary functional blocks required to
embed solid-state AC power and energy measurement. Included on chip are:
• An analog front end (AFE)
• An independent digital computation engine (CE)
• An 8051-compatible microprocessor (MPU) which executes one instruction per clock cycle (80515)
• A voltage reference
• A temperature sensor
• RAM and Flash memory
• A variety of I/O pins
Current sensor technologies supported include Current Transformers (CT) and Resistive Shunts.
In a typical application, the 32-bit compute engine (CE) of the 78M6613 sequentially processes the
samples from the voltage inputs on pins A0, A1, A2, A3 and performs calculations to measure active
energy (Wh), reactive energy (VARh), A2h, and V2h for four-quadrant measurement. These
measurements are then accessed by the MPU, processed further and output using the peripheral
interfaces available to the MPU.
In addition to the temperature-trimmed ultra-precision voltage reference, the on-chip digital temperature
compensation mechanism includes a temperature sensor and associated controls for correction of
unwanted temperature effects on measurement. Temperature dependent external components such as
crystal oscillator, current transformers (CTs), and their corresponding signal conditioning circuits can be
characterized and their correction factors can be programmed to produce measurements with
exceptional accuracy over the industrial temperature range, if desired.
A block diagram of the IC is shown in Figure 1. A detailed description of various functional blocks
follows.
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Rev. 1.1
5
5 Page 
DS_6613_018
78M6613 Data Sheet
2 Functional Description
2.1 Theory of Operation
The energy delivered by a power source into a load can be expressed as:
t
E = ∫V (t)I (t)dt
0
The following formulae apply for wide band mode (true RMS):
• P = ∑ (i(t) * v(t))
• Q = √(S2 – P2)
• S=V*I
• V = √∑v(t)2
• I = √∑i(t)2
For a practical measurement, not only voltage and current amplitudes, but also phase angles and
harmonic content may change constantly. Thus, simple RMS measurements are inherently inaccurate,
and true RMS measurements must be utilized. A modern solid-state electricity Power and Energy
Measurement IC such as the Teridian 78M6613 functions by emulating the integral operation above, i.e. it
processes current and voltage samples through an ADC at a constant frequency. As long as the ADC
resolution is high enough and the sample frequency is beyond the harmonic range of interest, the current
and voltage samples, multiplied with the time period of sampling will yield an accurate quantity for the
momentary energy. Summing up the momentary energy quantities over time will result in accumulated
energy.
500
400
300
200
100
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0
0
-100
5 10 15 20
-200
-300
-400
Current [A]
Voltage [V]
Energy per Interval [Ws]
Accumulated Energy [Ws]
-500
Figure 4: Voltage. Current, Momentary and Accumulated Energy
Figure 4 shows the shapes of V(t), I(t), the momentary power and the accumulated power, resulting from
50 samples of the voltage and current signals over a period of 20 ms. The application of 240 VAC and
100 A results in an accumulation of 480 Ws (= 0.133 Wh) over the 20 ms period, as indicated by the
Accumulated Power curve. The described sampling method works reliably, even in the presence of
dynamic phase shift and harmonic distortion.
For actual measurement equations, refer to the applicable firmware documentation.
Rev. 1.1
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet 78M6613.PDF ] | |
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