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FEATURES
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SA9106A SINGLE PHASE WATT MEASUREMENT IC WITH INTEGRATED 5 DIGIT LED DISPLAY DRIVER
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Performs bidirectional power measurement and directly drives a 5 digit (7 segment) LED display Accuracy better than 1% ( 1 count) Protected against ESD Total power consumption rating below 50mW
Adaptable to different types of current sensors Operates over a wide temperature range Precision voltage reference on-chip
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DESCRIPTION The SAMES SA9106A Single Phase Watt measurement integrated circuit has an integrated Light Emitting Diode (LED) display driver for a 5 digit (7 segment) display. The SA9106A performs the power calculations for active power. The method of calculation takes the power factor into account. The measured power is displayed in Watts and is updated approximately every 2 seconds, given an average power reading for this period. This innovative universal Watt measurement integrated circuit is ideally suited for the display of the measured power in industrial and domestic power measurement and multi plug sockets. The SA9106A integrated circuit is available in 40 pin dual-in-line plastic (DIP-40) as well as 44 pin plastic leaded chip carrier (PLCC-44) package types.
PIN CONNECTIONS
V SS V SSA CIP CIN COP CON TP7 TP8 IVP GND TP11 IIN IIP VREF TP15 CPON CPOP CPIN CPIP V DDA
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21
TP40 TP39 TP38 DIG[5] DIG[4] DIG[3] DIG[2] DIG[1] DIG[0] OSC1 OSC2 G F E D C B A TP22 V DD
DR-00235
Package: DIP-40
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4008 PDS039-SA9106A-001 REV. D 10-08-1995
SA9106A PIN CONNECTIONS
TP37 CIN CIP V SSA V SS TP40 TP39 DIG[5] DIG[4]
37 36 35 34 33 32 31 30 29
CON TP7 IVP GND TP44 TP1 IIN IIP TP4 TP5 VREF
COP TP38
39 38
40 41 42 43 44 1 2 3 4 5 6
28 27 26 25 24 23 22 21 20 19 18
DIG[3] DIG[2] DIG[1] DIG[0] OSC1 OSC2 G F E D C
7
8
9
10
11
12
13
14
15
16
17
CPON CPOP TP9 CPIN CPIP TP12 V DDA V DD
DR-00903
BLOCK DIAGRAM
V DD V SS
IIP
POWER
IIN
ANALOG SIGNAL PROCE-
INTEGRATOR
TP22 A B
LED DISPLAY DRIVER
OUTPUTS FOR LED DISPLAY
VOLTAGE REF.
IVP GND
SSING OSC TIMING
DR-00236
VREF
OSC1
OSC2
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SA9106A ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Supply Voltage VDD -VSS Current on any pin IPIN Storage Temperature TSTG Operating Temperature TO Min -0.3 -150 -40 -25 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. ELECTRICAL CHARACTERISTICS (VDD and VDDA = 2.5V, VSS and VSSA = -2.5V, over the temperature range -10C to +70C#, unless otherwise specified.) Parameter Supply Voltage: Positive Supply Voltage: Negative Supply Current: Positive Supply Current: Negative Symbol Min VDD VSS IDD ISS 2.25 -2.75 5 5 Typ Max 2.75 -2.25 10 10 Unit Condition V V mA mA
Current Sensor Inputs (Differential) Input Current Range III -25 +25 A Peak value
Voltage Sensor Input (Asymetric) Input Current Range Display outputs Digit Outputs Segment Drivers Oscillator Pin VREF Ref. Current Ref. Voltage
#
IIV IOL IOH
-25 80 20
+25
A mA mA
Peak value VOL = VSS + 0.5V VOH = VDD - 0.5V
Recommended crystal: TV colour burst crystal f = 3.5795 MHz -IR VR 45 1.1 50 55 1.3 A V With R7 = 24k connected to VSS Referred to VSS
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Extended Operating Temperature Range available on request. sames
SA9106A PIN DESCRIPTION
Pin PLCC 43 14 13 33 34 42 2 3 24 23 16 17 18 19 20 21 22 25 26 27 28 29 30 7 8 10 11 35 36 39 40 6 41 Pin DIP 10 21 20 1 2 9 12 13 31 30 23 24 25 26 27 28 29 32 33 34 35 36 37 16 17 18 19 3 4 5 6 14 7 8 11 15 22 38 Designation GND VDD VDDA VSS VSSA IVP IIN IIP OSC1 OSC2 A B C D E F G DIG [0] DIG [1] DIG [2] DIG [3] DIG [4] DIG [5] CPON CPOP CPIN CPIP CIP CIN COP CON VREF TP7 TP8 TP11 TP15 TP22 TP38 Description Ground Positive Supply Voltage Negative Supply Voltage Analog input for Voltage Inputs for current sensor Connections for crystal or ceramic resonator (OSC1 = Input ; OSC2 = Output) Light Emitting Diode (LED) display segment outputs
Light Emitting Diode (LED) display digit outputs
Connections for outer loop capacitor of A/D converter (Voltage) Connections for inner loop capacitor of A/D converter (Voltage) Connections for inner loop capacitor of A/D converter (Current) Connections for outer loop capacitor of A/D converter (Current) Connection for current setting resistor Manufacturer's Test Pins (Leave unconnected)
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SA9106A PIN DESCRIPTION (Continued)
Pin PLCC 31 32 1 4 5 9 12 37 38 44 Pin DIP 39 40 Designation TP39 TP40 TP1 TP4 TP5 TP9 TP12 TP37 TP38 TP44 Description Manufacturer's Test Pins (Leave unconnected)
FUNCTIONAL DESCRIPTION The SA9106A is a CMOS mixed signal Analog/Digital integrated circuit, which performs bidirectional power calculations across a power range of 1000:1, to an overall accurancy of better than 1% ( 1 count). An on-chip LED display driver directly drives a 5 digit (7 segment) LED display. The measured power is displayed in Watts. The integrated circuit comprises of 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. 1. Power Calculation In the Application Circuit (Figure 1), the voltage drop across the shunt will be between 0 and 50mV (0 to 80A through a shunt resistor of 625). This voltage is converted to a current of between 0 and 16A, by means of resistors R 1 and R2. The current sense input saturates at an input current of 25A peak. For the voltage sense input, the mains voltage (230VAC) is divided down through a divider to 14V. The resulting current into the A/D converter input is set at 14A at nominal mains voltage, via resistor R4 (1M). In this configuration, with a mains voltage of 230 V and a current of 80A, the displayed power is 18 400 Watts. 2. LED Display Driver The SA9106A has an on-chip LED display driver capable of driving 5 digit (7 segment) common cathode digits as well as a sign LED. The sign LED is addressed by DIG [5], the most significant digit by DIG [4] and the least significant digit by DIG [0]. The position of the segments a, b, c, d, e, f and g are shown in the diagram below:
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SA9106A
a f . e d
DR-00237
b g c
h
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3.
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
A
V DD
I
IIN
V SS V DD
IVP VOLTAGE SENSOR INPUT
V SS
AV
GND
DR-00505
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SA9106A 4. Electrostatic Discharge (ESD) Protection The SA9106A integrated circuit inputs/outputs are protected against ESD according to Mil-Std 883C, method 3015. Power Consumption The power consumption rating of the SA9106A integrated circuit is less than 50mW, excluding the display.
5.
TYPICAL APPLICATIONS In the Application Circuits (Figures 1 and 2) the components required for power measurement 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 SA9106A integrated circuit 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 the 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 16A into the SA9106A at maximum line current. Values for RSH of less than 200 should be avoided. R1 = R2 = (IL/16A) * RSH/2 Where IL = Line current RSH = Shunt resistor/termination resistor 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 14A. R7 together with the trimpot RT defines all on-chip bias and reference currents. The bias resistor value (RB = R7 + RT) may be varied within 10% for calibration purposes. Any change to RBwill affect the displayed value quadratically (i.e.: RB = +5%, Display value = +10%). 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.
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SA9106A
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
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SA9106A Parts List for Application Circuit: Figure 1 Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Symbol IC-1 D1 XTAL R1 R2 R3 R4 R6 R7 R8 R9 R10 R11 R12 R13 R14 RT C1 C2 C3 C4 C9 C10 C15 RSH Description SA9106A Light Emitting Diode Crystal, 3.5795 MHz Resistor, 1% metal Resistor, 1% metal Resistor, 390k, (230VAC) 1%, metal Resistor, 1M, 1/4W, 1% metal Resistor, 24k, 1/4W, 1% metal Resistor, 22k, 1/4W, 1% metal Resistor, (Segment G) Resistor, (Segment F) Resistor, (Segment E) Resistor, (Segment D) Resistor, (Segment C) Resistor, (Segment B) Resistor, (Segment A) Potentiometer 4.7k Capacitor, 560pF Capacitor, 560pF Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 100nF Capacitor, 100nF Capacitor, 820nF Shunt Resistor Note 3 Note 4 Note 2 Note 2 Note 2 Note 2 Note 2 Note 2 Note 2 Multi turn Colour burst TV Note 1 Note 1 Detail DIP-40/PLCC-44
Note 1: Resistor (R1 and R2) values are dependant upon the selected value of RSH. Note 2: Resistors (R8 to R14) are current limiting resistors required to set the intensity of the LED display segments. Note 3: Capacitor (C15) to be positioned as close to Supply Pins (VDD & VSS) of IC-1 as possible. Note 4: See TYPICAL APPLICATIONS when selecting the value of RSH. sames
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SA9106A
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
Note: Capacitor C11 may be selected for phase compensation and DC blocking.
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SA9106A Parts List for Application Circuit: Figure 2 Item 1 2 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 Symbol IC-1 XTAL RSH R1 R2 R3 R4 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 D1 RT C1 C2 C3 C4 C9 C10 C11 C15 Description SA9106A Crystal, 3.5795MHz Resistor Resistor, 1%, metal Resistor, 1%, metal Resistor, 390k, (230 VAC). 1%, metal Resistor, 1M, 1/4W, 1%, metal Resistor, 24k, 1/4W, metal Resistor, 22k, 1/4W, 1%, metal Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor, 820, 1/4W, 1% Resistor, 820, 1/4W, 1% Light emitting diode Potentiometer 4.7k Capacitor, 560pF Capacitor, 560pF Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 100nF Capacitor, 100nF Capacitor Capacitor, 820nF Note 4 Note 5 Multi turn Note 3 Note 3 Note 3 Note 3 Note 3 Note 3 Note 3 Detail DIP-40/PLCC-44 Colour burst TV Note 1 Note 2 Note 2
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SA9106A Note 1: Note 2: Note 3: Note 4: Note 5: See TYPICAL APPLICATIONS when selecting the value of RSH. Resistor (R1and R2) values are dependant upon the selected value of RSH. Resistors (R10 to R16) are current limiting resistors required to set the intensity of the LED display segments. Capacitor (C11) selected to minimize phase error introduced by current transformer (typically 1.5F). Capacitor (C15) to be positioned as close to Supply Pins (VDD & VSS) of IC-1, as possible.
ORDERING INFORMATION Part Number SA9106APA SA9106AFA Package DIP-40 PLCC-44
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SA9106A NOTES:
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SA9106A
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: energy@sames.co.za 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: 14/14 Fax: 012 333-6021 sames 012 333-8071 Tel: Fax: Int +27 12 333-6021 Int +27 12 333-8071

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