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Actions Semiconductor Co., LTD.
Single Phase Energy Meter IC --ATT7021
Actions Semiconductor Co.,LTD
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ATT7021
User's Manual
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Actions Semiconductor Co., LTD.
Single Phase Energy Meter IC --ATT7021
ATT7021 User's Manual
FEATURE * *
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High Accuracy, Wide Dynamic Range The High Frequency Output CF is intended for calibration.The Low Frequency Output F1 and F2 can be used to drive for Electromechanical Counters or Two Phase Stepper Motors. A Programmable Gain Amplifier(PGA) in the current channel Allows the Use of Small Values Shunt. The logic output REVP can be used to indicate a potential miswiring or negative power, the ATT7021 may measure positive and negative direction power, and energy can be accumulated according to the same direction.
* *
* * * * * * *
On - Chip Creep Protection. High Stability, Longevity Over 20 Years. Single +5V Power Supply, Low Power (Typical 15mW). On - Chip Power Supply Monitoring, On-chip reference voltage with external overdriven capability. No Leap Output CF make the Calibratioin Quickly and Correctly. Proprietary IP and 4 Patents. Fully Compatible With ADE7755
02131733.X 02131732.1 02249293.3 02500093.4
Have Applied for 4 Patents
The ATT7021 is available in 24 - lead DIP and SSOP Packages.
PIN CONFIGURATION
DIP and SSOP Packages
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Actions Semiconductor Co., LTD.
Single Phase Energy Meter IC --ATT7021
ATT7021 IC DIAGRAM:
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PIN FUNCTIONS DESCRIPTIONS
Pin Number 1, 3 2 4,19 5, 6 7, 8 9 10 11,21 12 13,14 15,16 17,18 20 22 23,24 Mnemonic AVDD , DVDD AC/DC NC V 1P , V1N, V 2N , V2P, RESET REFIN AGND ,DGND SCF S1,S0 G1,G0 CLKIN ,CLKOUT REVP CF F2 , F1 Description Analog Power Supply and Digital Power Supply High Pass Filter Select No Connect Analog Input for Current Channel Analog Input for Voltage Channel System Reset Pin The Reference Voltage Output Analog Ground and Digital Ground. Select Calibration Frequencies Select the Frequencies for The digital to Frequency Conversion. PGA Select Crystal Pin Negative active power flag The High Frequency Output The Low Frequency Output
Note the CF is the Calibration output. As below in the application circuit.
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Single Phase Energy Meter IC --ATT7021
DIGITAL CHARACTERISTICS
Electrical Characteristics (Ta=25 ,AVDD =5V, DVDD =5V, fOSC=3.579545MHz, (Vi~Vv) = 0) Test Point Power output Pin10 Min. Typical 4 Max 5.5 Unit mA
Items Current Reference Voltage
Mnemonic Idd
Test Conditions Vv=0.248V Vi=1.75mV Vv,Vi=0 Variable Temperature From -40~+80
=,ISOURCE=10mA,DVDD=5 V =0,SINK=10mA,DVDD=5V
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Vref
2.3
2.5
2.7
V
Vref Temperature Coefficient
Pin10
30
60
ppm/
REVP Logic Outputs
Pin9
4.5 0.5
V V
F1 F2 CF SCF S0,S1 G0,G1 AC/DC Reset
ISOURCE=10mA,DVDD=5V
ISINK=10mA,DVDD=5V
Pin22 Pin23 Pin24
High 4 Low 0.5 High 4.5 V
Logic Inputs
DVDD=5V5% Low 0.8 DVDD=5V Dynamic Range 500 1 G=1,2,8,16. 10 mA
Start-up Current Accuracy error
ISTART
e
Pin22
0.1
Absolute Maximum Ratings ITEMS Digital Power Analog Power Current Channel Voltage Voltage Channel Voltage Work Temperature Store Temperature
( T = 25
) Range -0.3 + 7 -0.3 + 7 6 6 -40 -65 6 6 +85 +150 Unit V V V V
O O
Mnemonic DVDD AVDD VV Vi Topr Tstr
C C
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Single Phase Energy Meter IC --ATT7021
PERFORMANCE PARAMETER
1) Frequency Outputs F1 and F2 The ATT7021's output frequency or pulse rate is related to the input voltage signals by the following equation Frequency 2) Error as e N % of reading Percentage Error
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8.06 x V 1 x V 2 x G x F1-4 V 2 REF
The ATT7021's percentage error is defined as
Energy Re gistered By ATT 7021 True Energy x 100 Ture Energy
3) Start - up Current and No load Threshold The ATT7021 also includes a Start-up Current and No load threshold feature that will eliminate any creep effects in the meter. The ATT7021 is designed to issue a minimum output frequency on all modes except when SCF = 0 and S1 = S0 = 1. The no-load detection threshold is disabled on this output mode to accommodate specialized application of the ATT7021. Any load generating a frequency lower than this minimum frequency will not cause a pulse to be issued on F1, F2 or CF. The minimum output frequency is given as 0.0014% of the full-scale output frequency for each of the F1-4 frequency selections. A start-up current 10 mA at 220 V and PF=1.
APPLICATION NOTES:
Table I F1 and F2 Frequency at 100imp/kWhr Table II S1 , S0 SCF VS CF Frequency ( full input ) F1-4 1.7 3.4 6.8 13.6 F1/2 (Hz) 0.34 0.68 1.36 2.72 CF(Hz) 128xF1,F2 64xF1,F2 64xF1,F2 32xF1,F2 32xF1,F2 16xF1,F2 16xF1,F2 2048xF1,F2
IMAX 12.5 A 25 A 40 A 60 A 80 A 120 A
F1 and F2 (Hz) 0.076 0.153 0.244 0.367 0.489 0.733
SCF,S1,S0 100 000 101 001 110 010 111 011
Note :
1) User can select the frequency of F1 according to the table. 2) The CF logic output gives instantaneous real power information. The output is intended to be
used for calibration purpose, or interfacing to an MCU. The Equation where: 3) Performance Parameter Sections Freq = Output frequency on F1 and F2 (Hz) V1 = Differential rms voltage signal on Channel 1 (volts) V2 = Differential rms voltage signal on Channel 2 (volts) Gain = 1, 2, 8 or 16, depending on the PGA gain selection made using logic inputs G0 and G1
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Single Phase Energy Meter IC --ATT7021
VREF = The reference voltage (2.5 V 8%) (volts) F1 4 = One of four possible frequencies selected by using the logic inputs S0 and S1 see Table II
Typical Application Circuit
1 2 3 4 5 6 7 8
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Z1 Z C1 0.47UF/250V D1 1000U/25V IN4007 D2 IN4007 DW1 C5 0.1U C7 C8 0.1U 3 U1 Vin WS78L05 +5V 1
D
D
TP1 TP
4
N
R1 470/5W
RV1 14K420
ATT7021
Single-Phase Energy Meter Demo
TP3 C9 0.1U TP DVDD TP4 C10 0.1U F1 F2 24 23 22 21 20 19 C17 18 17 16 C18 15 14 13 S0 S1 22P JP6 0 JP10 0 XT1 22P JP4 0 JP5 0 JP8 0 JP9 0 B F1 F2 CF R3 R4 100 100 PS1 D3 NEC2501 LED TP8 TP7 TP TP JP1 0 JP3 0 JP2 0 JP7 0 TP R5 10K C
TP2 TP
3
Z2 Z
Z3 Z C
C3 10U/50V C2 0.1U
R2 100 C4 0.1U
DVDD C6 470U/16V 1 2 U2 DVDD AC/DC AVDD NC V1P V1N V2N V2P RESET REF AGND SCF ATT7021
TP5 TP
2
Z4 Z
R6 1K
2
GND
C11 0.033U
AVDD
3 4
CF DGND REVP NC CLKOUT CLKIN G0 G1 S0 S1
R10 510
V1P TP6 TP 1 Z5 Z R7 1K C12 0.033U R8 1K 0.033U C13 C14 R9 1K 0.033U C15 10U/50V V1N V2N V2P
5 6 7 8 9 10 11 12
B
C16 0.1U V2N
C19 0.1U
J1
0
J2
0
J3 0
J4 0
J5 0
J6 0
J7 0
J8 0
J9 0
J10 0
J11 0 Actions Semiconductor Co., Ltd. Title Version Date Sheet Drawn By Checked By Approved By Size 1 of 1
N A
R11 330K
*
R12 * 330K
R13 100K
R14 100K
R15 100K
R16 68K
R17 47K
R18 20K
R19 10K
R20 6.2K
R21 4.7K
R22 2.7K
R23 1.2K
1.0
A
A3
8
1
2
3
4
5
6
7
Application Example
Design parameters: Line voltage = 220 V (nominal) IMAX = 40 A (Ib = 5 A) Counter = 100 imp/kWh Meter constant = 3200 imp/kWh Shunt size = 350 100 imp/hour = 100/3600 sec = 0.027777 Hz Meter will be calibrated at Ib (5A) 5 A = 1.1 kW Power dissipation at Ib = 220 V Frequency on F1 (and F2) at Ib = 1.1 0.027777 Hz= 0.0305555 Hz Voltage across shunt (V1) at Ib = 5 A 350 = 1.75 mV. In this example, with ac voltages of 1.75 mV Rms applied to V1 and expected output frequency is calculated as follows:
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X mV Rms applied to V2, the
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Actions Semiconductor Co., LTD. Gain = 1, G0 = G1 = 1 F1-4 = 3.4 Hz, S0 =0, S1 = 1, SCF=0 V1 = rms of 1.75 mV = 1.75 10 3 volts V2 = rms of X mV = X 10 3 volts VREF = 2.5 V (nominal reference value).
Single Phase Energy Meter IC --ATT7021
Freq=
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8.06 x G x V 1 x V 2 x F1-4 8.06 x 16 x 1.75 x 10 -3 x X x 3.4 = 2.52 2.52 8.06 x 16 x 1.75 x 10 -3 x X x 3.4 2.52

0.030555Hz =
X = 0.249 V rms V2 = 249 mV rms Therefore, in order to calibrate the meter the line voltage needs to be attenuated down to 249 mV rms. Note: To select the F1-4 frequency for the above Equation see the Table I and Table II, Application Note section. From Tables I and II it can be seen that the best choice of frequency for a meter with IMAX = 40 A is 3.4 Hz (F1/2). This frequency selection is made by the logic inputs S0 and S1 see Table II . The CF frequency selection (meter constant) is selected by using the logic input SCF. The two available options are 64 F1(6400 imp/kWh) or 32 selected by setting SCF logic low. F1(3200 imp/kWh). For this design, 3200 imp/kWh is
< End >
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Actions Semiconductor Co., LTD. BOM: Part Used PartType Designators -----------------------------------------------------------------------1 2
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Single Phase Energy Meter IC --ATT7021
2 21
0
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
8 4 1 1 4 1 1 1 2 2 1 1 2 1 1 3 3 2 1 1 1 1 1 2 1 1 8 1 5
0.1U 0.033U 0.47UF/250V 1.2K 1K 2.7K 4.7K 6.2K 10K 10U/50V 14K420 20K 22P 47K 68K 100 100K 330K 470/5W 470U/16V 510 1000U/25V ATT7021 IN4007 LED NEC2501 TP WS78L05 Z
DW1 XT1 J1 J2 J3 J4 J5 J6 J7 J8 J9 J10 J11 JP1 JP2 JP3 JP4 JP5 JP6 JP7 JP8 JP9 JP10 C2 C4 C5 C8 C9 C10 C16 C19 C11 C12 C13 C14 C1 R23 R6 R7 R8 R9 R22 R21 R20 R5 R19 C3 C15 RV1 R18 C17 C18 R17 R16 R2 R3 R4 R13 R14 R15 R11 R12 R1 C6 R10 C7 U2 D1 D2 D3 PS1 TP1 TP2 TP3 TP4 TP5 TP6 TP7 TP8 U1 Z1 Z2 Z3 Z4 Z5
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