sames
SA9102F/SA9102H
SINGLE PHASE BIDIRECTIONAL POWER/ENERGY
METERING IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES
n
Performs bidirectional power and
energy measurement
n
Adaptable to different types of current
sensors
n
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
n
Operates over a wide temperature
range
n
n
Protected against ESD
Precision voltage reference on-chip
Two output signal formats available
n
Power consumption rating typically
25mW
DESCRIPTION
The SAMES SA9102F and SA9102H Single
Phase bidirectional Power/Energy metering
integrated circuits generate pulse rate
outputs for positive and negative energy
directions, the frequency of which is
proportional to the power consumption.
These devices perform the calculation for
active power.
The method of calculation takes the power
factor into account.
Energy consumption is determined by the
power measurement being integrated over
time.
These innovative universal power/energy
metering integrated circuits are ideally suited
for energy calculations in applications such
as electricity dispensing systems (ED's),
residential municipal metering and factory
energy metering and control.
The SA9102F and SA9102H integrated
circuits are available in both 20 pin dual-inline plastic (DIP-20), as well as 20 pin small
outline (SOIC-20) package types.
n
PIN CONNECTIONS
IIN
1
20
GND
IIP
2
19
IVP
VREF
3
18
CON
CPON 4
17
COP
CPOP 5
16
CIN
CPIN
6
15
CPIP
V DD
7
14
CIP
V SS
8
13
DIR
TP9
9
12
FOUT
OSC2 10
11
OSC1
DR-00906
Package: DIP-20
SOIC-20
1/14
4352
PDS039-SA9102F-001
REV. B
08-01-97
SA9102F/SA9102H
BLOCK DIAGRAM
V DD
IIP
V SS
FOUT
POWER
DIR
IIN
ANALOG
INTEG-
POWER
RATOR
TO
SIGNAL
FREQUENCY
PROCEVOLTAGE
REF.
SSING
IVP
GND
OSC
DR-00907
VREF
OSC1
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage
VDD -VSS
Current on any pin
IPIN
Storage Temperature
TSTG
Operating Temperature
TO
TIMING
OSC2
Min
-0.3
-150
-40
-40
Max
6.0
+150
+125
+85
Unit
V
mA
°C
°C
* Stresses above those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. This is a stress rating only. Functional operation of the device
at these or any other condition above those indicated in the operational sections of this
specification, is not implied. Exposure to Absolute Maximum Ratings for extended
periods may affect device reliability.
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SA9102F/SA9102H
ELECTRICAL CHARACTERISTICS
(VDD = 2.5V, VSS = -2.5V, over the temperature range -10°C to +70°C#, unless otherwise
specified.)
Parameter
Symbol Min
Typ
Max
Unit Condition
Supply Voltage: Positive
VDD
2.25
2.75
V
Supply Voltage: Negative
VSS
-2.75
-2.25
V
Supply Current: Positive
IDD
5
6
mA
Supply Current: Negative
ISS
5
6
mA
-25
+25
µA
Peak value
IIV
-25
+25
µA
Peak value
VOL
VOH
VSS+1
VDD-1
V
V
IOL = 5mA
IOH = -2mA
64
180
Hz
Hz
Specified linearity
Min and max limits
Current Sensor Inputs (Differential)
Input Current Range
III
Voltage Sensor Input (Asymmetrical)
Input Current Range
Pins FOUT, DIR
Output Low Voltage
Output High Voltage
Pulse Rate FOUT
fP
Oscillator
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
Pin VREF
Ref. Current
Ref. Voltage
#
0
0
-IR
VR
45
1.1
50
55
1.3
µA
V
With R = 24kΩ
connected to VSS
Referred to VSS
Extended Operating Temperature Range available on request.
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SA9102F/SA9102H
PIN DESCRIPTION
Pin
Designation
Description
20
8
GND
VDD
Ground
Positive Supply Voltage
14
VSS
Negative Supply Voltage
19
IVP
Analog input for Voltage
1
IIN
Inputs for current sensor
2
IIP
11
OSC1
Connections for crystal or ceramic resonator
10
OSC2
(OSC1 = Input ; OSC2 = Output)
12
FOUT
Pulse rate output
13
DIR
Direction indication output
4
CPON
Connections for outer loop capacitor of
5
CPOP
A/D converter (Voltage)
6
CPIN
Connections for inner loop capacitor of
7
CPIP
A/D converter (Voltage)
15
CIP
Connections for inner loop capacitor of
16
CIN
A/D converter (Current)
17
COP
Connections for outer loop capacitor of
18
CON
A/D converter (Current)
3
VREF
Connection for current setting resistor
9
TP9
Test Pin. Connect to VSS
FUNCTIONAL DESCRIPTION
The SA9102F/SA9102H are CMOS mixed signal Analog/Digital integrated circuits, which
perform bidirectional power/energy calculations across a power range of 1000:1, to an
overall accurancy of better than Class 1.
These integrated circuits includes all the required functions such as two oversampling
A/D converters for the voltage and current sense inputs, power calculation and energy
integration. Internal offsets are eliminated through the use of cancellation procedures.
These devices generate pulses, the frequency of which is proportional to the power
consumption. The pulse rate follows the instataneous power measured. Direction
information is also provided.
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SA9102F/SA9102H
1.
Power calculation
In the Application Circuit (Figure 1), the voltage drop across the shunt will be
between 0 and 16mV (0 to 80A through a shunt resistor of 200µΩ). This voltage is
converted to a current of between 0 and 16µA, by means of resistors R 1 and R2.
The current sense input saturates at an input current of ±25µA peak.
For the voltage sensor input, the mains voltage (230VAC) is divided down through
a divider to 14V. The current into the A/D converter input is set at 14µA at nominal
mains voltage, via resistor R4 (1MΩ).
In this configuration, with a mains voltage of 230V and a current of 80A, the output
frequency of the SA9102F and SA9102H power meter chips at FOUT (Pin 12) is
64Hz. In this case 1 pulse will correspond to an energy consumption of 18.4kW/
64Hz = 287.5Ws.
2.
Analog Input configuration
The input circuitry of the current and voltage sensor inputs are illustrated below.
These inputs are protected against electrostatic discharge through clamping
diodes.
The feedback loops from the outputs of the amplifiers AI and AV generate virtual
shorts on the signal inputs. Exact duplications of the input currents are generated
for the analog signal processing circuitry.
V DD
IIP
CURRENT
SENSOR
INPUTS
V SS
AI
V DD
IIN
V SS
V DD
IVP
VOLTAGE
SENSOR
INPUT
DR-00908
sames
V SS
A
V
GND
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SA9102F/SA9102H
3.
4.
5.
Electrostatic Discharge (ESD) Protection
The SA9102F/SA9102H integrated circuits inputs/outputs are protected against
ESD.
Power Consumption
The power consumption rating of the SA9102F and SA9102H integrated circuits is
less than 30mW.
Pulse Output Signals
The calcualted power is divided down to a pulse rate of 64Hz, for rated conditions
on FOUT (Pin 12), for both the SA9102F and SA9102H.
The format of the pulse output signal, which provides power/energy and direction
information, is the only difference between the SA9102F and SA9102H devices.
The direction of the energy flow is defined by the mark/space ratio in the SA9102F,
while the pulse width defines the direction on the SA9102H.
Waveform on FOUT (Pin 12)
Positive Energy Flow
Negative Energy Flow
SA9102F
SA9102H
t pp
t pp
m m
m m
t pp = 1.1ms
t pn
m m
t pn
m m
t pn = 3.4ms
Waveform on DIR (Pin 13)
DR-00909
An integrated anticreep function ensures no metering at zero line currents.
6/14
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SA9102F/SA9102H
The formula for calculating the output frequency (f) is given below:
f = 11.16 * FOUTX *
Where FOUTX
FOSC
3.58MHz
*
II .IV
IR 2
= Nominal rated frequency (64Hz)
FOSC
= Oscillator frequency (2MHz ...... 4MHz)
II
= Input currents for current inputs (16µA at rated)
IV
= Input currents for voltage inputs (14µA at rated)
IR
= Reference current (typically 50µA)
XTAL is a colour burst TV crystal (f = 3.5795MHz) for the oscillator. The oscillator
frequency is divided down to 1.7897MHz on-chip, to supply the digital circuitry and the
A/d converters.
TYPICAL APPLICATIONS
In the Application Circuits (Figures 1 and 2), the components required for power metering
applications are shown.
In Figure 1 a shunt resistor is used for current sensing. In this application, the circuitry
requires a +2.5V, 0V, -2.5V DC supply.
In the case of Figure 2, when using a current transformer for current sensing, a +5V, 0V
DC supply is sufficient.
The most important external components for the SA9102F and SA9102H integrated
circuits are:
C1 and C2 are the outer loop capacitors for the two integrated oversampling A/D
converters. The value of these capacitors is 560pF.
The actual values determine signal to noise and stability performance. The tolerances
should be within ±10%.
C3 and C4 are the inner loop capacitors of the A/D converters. The optimum value is
3.3nF. The actual values are uncritical. Values smaller than 0.5nF and larger than 5nF
should be avoided.
R2, R1 and RSH are the resistors defining the current level into the current sense input.
The values should be selected for an input current of 16µA into the SA9102F/SA9102H
at maximum line current.
Values for RSH of less than 200µΩ should be avoided.
R1 = R2 = (IL/16µA) * RSH/2
Where IL
= Line current
RSH
= Shunt resistor/termination resistor
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7/14
SA9102F/SA9102H
R3, R6 and R4 set the current for the voltage sense input. The values should be selected
so that the input current into the voltage sense input (virtual ground) is set to 14µA.
R7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum conditions
are set. R7 may be varied within ±10% for calibration purposes. Any change to R7 will
affect the output quadratically (i.e.: R7 = +5%, fP = +10%).
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
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SA9102F/SA9102H
Parts List for Application Circuit: Figure 1
Item Symbol
Description
1
IC-1
SA9102F/SA9102H
2
D1
Diode, Silicon, 1N4148
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
D2
ZD1
ZD2
XTAL
R1
R2
R3
R4
R5
R6
R7
R9
R10
C1
C2
Diode, Silicon, 1N4148
Diode, Zener, 2.4V, 200mW
Diode, Zener, 2.4V, 200mW
Crystal, 3.5795MHz
Resistor, 1% metal
Resistor, 1% metal
Resistor, 390k, (230VAC) 1%, metal
Resistor, 1M, 1/4W, 1%, metal
Resistor, 470Ω, 2W, 1%, carbon
Resistor, 24k, 1/4W, 1%, metal
Resistor, 24k, 1/4W, 1%, metal
Resistor, 680Ω, 1/4W, 1%
Resistor, 680Ω, 1/4W, 1%
Capacitor, 560pF
Capacitor, 560pF
18
19
20
21
22
23
24
25
26
C3
C4
C9
C10
C11
C13
C14
C15
RSH
Capacitor, 3.3nF
Capacitor, 3.3nF
Capacitor, 100nF
Capacitor, 100nF
Capacitor, 0.47µF, 250VAC, polyester
Capacitor, 100µF
Capacitor, 100µF
Capacitor, 820nF
Shunt Resistor
Detail
DIP-20/SOIC-20
Colour burst TV
Note 1
Note 1
Note 2
Note 3
Note 1: Resistor (R1 and R2) values are dependant upon the selected value of RSH.
Note 2: Capacitor (C15) to be positioned as close to Supply Pins (VDD & VSS) of IC-1 as
possible.
Note 3: See TYPICAL APPLICATIONS when selecting the value of RSH.
sames
9/14
SA9102F/SA9102H
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
10/14
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SA9102F/SA9102H
Parts List for Application Circuit: Figure 2
Item Symbol
1
IC-1
2
XTAL
3
RSH
4
R1
5
R2
6
R3
7
R4
8
R6
9
R7
10
R8
11
R9
12
C1
13
C2
14
C3
15
C4
16
C9
17
C10
18
C11
19
CT
Note 1:
Note 2:
Note 3:
Note 4:
Description
SA9102F/SA9102H
Crystal, 3.5795MHz
Resistor
Resistor, 1%, metal
Resistor, 1%, metal
Resistor, 390k, (230VAC), 1%, metal
Resistor, 1M, 1/4W, 1%, metal
Resistor, 24k, 1/4W, metal
Resistor, 24k, 1/4W, 1%, metal
Resistor, 2.2k, 1/4W, 1%, metal
Resistor, 2.2k, 1/4W, 1%, metal
Capacitor, 560pF
Capacitor, 560pF
Capacitor, 3.3nF
Capacitor, 3.3nF
Capacitor, 820nF
Capacitor, 100nF
Capacitor
Current Transformer
Detail
DIP-20/SOIC-20
Colour burst TV
Note 1
Note 2
Note 2
Note 3
Note 4
See TYPICAL APPLICATIONS when selecting the value of RSH.
Resistor (R1and R2) values are dependant upon the selected value of
RSH.
Capacitor (C9) to be positioned as close to Supply Pins (VDD & VSS) of IC-1,
as possible.
Capacitor (C11) selected for DC blocking and to minimize phase error
introduced by current transformer (typically 1.5µF).
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11/14
SA9102F/SA9102H
ORDERING INFORMATION
Part Number
Package
SA9102FPA
DIP-20
SA9102FSA
SA9102HPA
SA9102HSA
12/14
SOIC-20
DIP-20
SOIC-20
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SA9102F/SA9102H
NOTES:
sames
13/14
SA9102F/SA9102H
Disclaimer:
The information contained in this document is confidential and proprietary to South African MicroElectronic Systems (Pty) Ltd ("SAMES") and may not be copied or disclosed to a third party, in whole or in part,
without the express written consent of SAMES. The information contained herein is current as of the date of
publication; however, delivery of this document shall not under any circumstances create any implication that the
information contained herein is correct as of any time subsequent to such date. SAMES does not undertake to inform
any recipient of this document of any changes in the information contained herein, and SAMES expressly reserves
the right to make changes in such information, without notification,even if such changes would render information
contained herein inaccurate or incomplete. SAMES makes no representation or warranty that any circuit designed
by reference to the information contained herein, will function without errors and as intended by the designer.
Any Sales or technical questions may be posted to our e-mail address below:
[email protected]
For the latest updates on datasheets, please visit out web site:
http://www.sames.co.za
South African Micro-Electronic Systems (Pty) Ltd
P O Box 15888,
33 Eland Street,
Lynn East, 0039
Koedoespoort Industrial Area,
Republic of South Africa,
Pretoria,
Republic of South Africa
Tel:
Fax:
14/14
012 333-6021
012 333-8071
sames
Tel:
Fax:
Int +27 12 333-6021
Int +27 12 333-8071