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PDF AT73C501 Data sheet ( Hoja de datos )
| Número de pieza | AT73C501 | |
| Descripción | Chip Set Solution for Watt-Hour Meters | |
| Fabricantes | ATMEL Corporation | |
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Features
• Fulfills IEC 1036, Class 1 Accuracy Requirements
• Fulfills IEC 687, Class 0.5 and Class 0.2 Accuracy, with External Temperature
Compensated Voltage Reference
• Simultaneous Active, Reactive and Apparent Power and Energy Measurement
• Power Factor, Frequency, Voltage and Current Measurement
• Single and Poly Phase Operation
• Three Basic Operating Modes: Stand-Alone Mode, Microprocessor Mode and Multi-
Channel Mode
• Flexible Interfacing, 8-bit Microprocessor Interface, 8-bit Status Output and Eight
Impulse Outputs
• Calibration of Gain and Phase Error
• Compensation of the Non-Linearity of Low Power Measurement
• Adjustable Starting Current and Meter Constant
• Measurement Bandwidth of 1000 Hz
• Tamper Proof Design
• Single +5V Supply
Description
A two chip solution, consisting of AT73C500 and AT73C501 (or AT73C502), offers all
main features required for the measurement and calculation of various power and
energy quantities in static Watt-hour meters. The devices operate according to
IEC1036, class 1, specification. IEC 687, class 0.5 and 0.2 requirements are fulfilled
when used with external temperature compensated voltage reference.
The AT73C501 contains six, high-performance, Sigma-Delta analog-to-digital convert-
ers (ADC). The AT73C500 is based on an efficient digital signal processor (DSP) core
and it supports interfacing both with the AT73C501 and with an external microproces-
sor. The AT73C500 DSP can also be used with the differential input ADC, AT73C502.
With this chipset, only a minimum of discrete components is required to develop prod-
ucts ranging from simple domestic Watt-hour meters to sophisticated industrial
meters. The chipset can be used in single-phase as well as in poly-phase systems.
The DSP core of the AT73C500 is easy to configure. By changing the mode of the
AT73C500, the device can be operated in a stand-alone environment or be used with
a separate control processor. It is also possible to configure the circuit to perform the
functions of three independent single phase Wh meters.
The chips support calibration of gain and phase error. All calibrations are done in the
digital domain and no trimming components are needed. The calibration coefficients
are either stored in an EEPROM memory or supplied by an external microprocessor.
(continued)
Chip Set
Solution for
Watt-Hour
Meters
AT73C500 with
AT73C501 or
AT73C502
Rev. 1035A–08/98
1
1 page  
AT73C500
AT73C500 DSP
Figure 5. PLCC-44 package pin layout
IRQ0 /
GND SOUT1 SOUT0 PFAIL GND
GND
CLK STROBE VCC ADDR2 ADDR1
6 5 4 3 2 1 44 43 42 41 40
GND 7
39 ADDR0
B0 8
38 XRES
B1 9
37 BRDY
B2 10
36 RD/WR
GND 11
35 VCC
GND 12
34 GND
B12 13
33 SIN
B13 14
32 SCLK
B14 15
31 IRQ1 / ACK
GND 16
30 GND
B15 17
29 B11
18 19 20 21 22 23 24 25 26 27 28
B3 B4 GND B5 B6 B7 N/C B8 B9 GND B10
Power
Supply
Pins
VCC
GND
Pin
35, 42
1, 2, 6, 7,
11, 12,16,
20, 27, 30,
34
I/O Description
PWR Digital Supply, Positive, +5V
PWR Digital Supply, Negative, 0V
Digital
Inputs
CLK
XRES
IRQ0
IRQ1
Pin
44
38
3
31
I/O Description
I Clock Input
I Reset Input, active low
Interrupt Input, usually
I connected to PFAIL output
of AT73C501
I
Interrupt Input, connected to
ACK Output of AT73C501
Status/
Mode
Bus
B15
B14
B13
B12
B11
B10
B9
B8
Pin
17
15
14
13
29
28
26
25
I/O Description
I/O Status/Mode Bus, Bit7
I/O Status/Mode Bus, Bit6
I/O Status/Mode Bus, Bit5
I/O Status/Mode Bus, Bit4
I/O Status/Mode Bus, Bit3
I/O Status/Mode Bus, Bit2
I/O Status/Mode Bus, Bit1
I/O Status/Mode Bus, Bit0
Microprocessor
Bus Pin I/O
B7 23 I/O
B6 22 I/O
B5 21 I/O
B4 19 I/O
B3 18 I/O
B2 10 I/O
B1 9 I/O
B0 8 I/O
Description
µP Bus, Bit7
µP Bus, Bit6
µP Bus, Bit5
µP Bus, Bit4
µP Bus, Bit3
µP Bus, Bit2
µP Bus, Bit1
µP Bus, Bit0
AT73C501 /
AT73C502 and
EEPROM
Interface
SOUT0
SOUT1
SIN
SCLK
Pin I/O Description
4
O
Serial Output, used as a
clock for EEPROM
Serial Output, used as Chip
5
O
Select (CS) for AT73C501
and as Data Input (DI) for
EEPROM
33
I
Serial Data Input, data from
AT73C501 or from EEPROM
32
I
Serial Clock Input, bit clock
from AT73C501
Control Signals
of µP Bus and
Status/Mode
Bus Pin I/O Description
STROBE
43 O Strobe Output
BRDY
37
I
Microprocessor ready for
I/O, Active Low
ADDR1
40
O
Address Output 1, used for
µP bus
ADDR0
Address Output 0, used for
39 O Status/ Mode bus and for
Impulse Outputs
RD/WR
36 O Read/Write Signal
5
5 Page 
AT73C500
It is recommended that 50 Hz meters are operated from
3.2768MHz crystal. In 60 Hz system, a 3.93216 MHz clock
is normally used. Because the clock frequency generates a
time reference for energy calculations, the content of
energy registers and also the pulse rate of impulse outputs
will change when crystal is changed. For example, the
nominal meter constant and display pulse rate of 60 Hz
meter (3.93216 MHz clock) is:
MC = 65----00---HH----zz-- × 1250k--i-mW-----p-h-- = 1500k--i-mW-----p-h--
and
The LSB of energy registers correspond to 0.33Wh instead
of 0.4Wh, as follows:
ELSB = 3--3--.-9.--2--3--7-2--6-1--8--6-M--M----H-H---z-z-- × 0.4Wh = 0.333333…Wh
The pulse rate can be scaled to 100 imp/kWh by program-
ming value 5 to MCC coefficient, as below:
IMP = (25 + MCC)i--m--1---p-- × ELSB = 30 i--m--1---p-- × 0.3333…Wh = 10 i-W-m-----hp--
DP = 65----00---HH----zz-- × 100k--i-mW-----p-h-- = 120k--i-mW-----p-h--
which equals 100 impulses per kilowatt hour.
The following table summarizes the contents of all mea-
surement registers.
Register
REG0 - REG2
REG3 - REG5
REG6 - REG8
REG9 - REG11
REG12 - REG15
REG16
REG17
REG19 - 21
REG22 - 24
Conditions
U = 270V, I = 80A, PF = 1
U = 270V, I = 80A, PF = 0
U = 270V, I = 80A
PF = 1
PF = -1
W = 1.718GWh
∆T = 238609.3h
50*T = 40.959s
U = 270V
I = 80A
Full Scale Output (hex)
258F C2F7
2231 594D
258E
7FFF
8001
FFFF FFFF
FFFF FFFF
7FFF
7A8B
7DA4
Resolution (hex)
34.276 µW
37.653 µVAr
2.2467 VA
0.0000305
-0.0000305
0.4Wh
0.2s
1.25 ms
8.6 mV
2.5 mA
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet AT73C501.PDF ] | |
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