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SA9122E SINGLE PHASE UNIDIRECTIONAL POWER/ENERGY METERING IC WITH SEPERATE 64 SEGMENT LCD DRIVER
FEATURES
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Performs unidirectional power and energy measurement On-chip 64 segment LCD driver Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters Total power consumption rating below 25 mW
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Adaptable to different types of current sensors Operates over a wide temperature range Different pulse rate options available for power information LCD data input via a serial interface
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DESCRIPTION
The SAMES SA9122E Single Phase unidirectional active Power/Energy metering integrated circuit includes a seperate onchip 64 segment Liquid Crystal Display driver. The power/energy metering circuit generates a pulse rate output, proportional to the power consumption, while the LCD driver is programmable via a serial interface. The method of power calculation takes the power factor into account. Energy consumption is determined by the power measurement being integrated over time. The LCD driver is capable of driving 8 decimal digits (7 segment) and 8 announciators on a 4 track multiplexed backplane display. This innovative combination energy metering/ LCD display driver integrated circuit has been designed to provide meter designers with flexibility in the choice of the -controller employed, and is ideally suited for applications such as residential municipal metering and factory energy metering and control. The SA9122E integrated circuit is available in both 40 pin dual-in-line plastic (DIP-40), as well as 44 pin plastic leaded chip carrier (PLCC-44) package types.
4362
PIN CONNECTIONS
RX V SS CIP CIN COP CON IVN IIP IIN GND VREF CPON CPOP CPIN CPIP V DD R[0] R[1] R[2] R[3]
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 FOUT2 39 FOUT1 38 OSC1 37 OSC2 36 S[15] 35 S[14] 34 S[13] 33 S[12] 32 S[11] 31 S[10] 30 S[9] 29 S[8] 28 S[7] 27 S[6] 26 S[5] 25 S[4] 24 S[3] 23 S[2] 22 S[1] 21 S[0]
DR-00932
Package: DIP-40
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PDS039-SA9122E-001 REV. A 19-09-1995
SA9122E
S[15] OSC2 OSC1 FOUT1 FOUT2 N.C. RX VS S CIP CIN COP
S[14] S[13] S[12] S[11] S[10] N.C. S[9] S[8] S[7] S[6] S[5]
39 38 37 36 35 34 33 32 31 30 29
40 41 42 43 44 1 2 3 4 5 6
28 27 26 25 24 23 22 21 20 19 18
S[4] S[3] S[2] S[1] S[0] N.C. R[3] R[2] R[1] R[0] VD D
7
8
9
10
11
12
13
14
15
16
17
DR-00934
Package: PLCC-44 BLOCK DIAGRAM
V DD V SS
IIP
CON IVN IIP IIN GND N.C.
POWER
IIN
VREF CPON CPOP CPIN CPIP
ANALOG SIGNAL PROCE-
INTEGRATOR
POWER TO FREQUENCY
FOUT1 FOUT2
S[15]
SRAM VOLTAGE REF.
SEGMENT DRIVERS
S[0]
IVP GND
SSING
R[3]
OSC
SERIAL INTERFACE
BACKPLANE DRIVERS
R[0]
DR-00933
VREF
OSC1
OSC2
RX
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SA9122E 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 -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. ELECTRICAL CHARACTERISTICS (VDD = 2.5V, VSS = -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 7 7 Unit Condition V V mA mA
Current Sensor Inputs (Differential) Input Current Range III -25 +25 A Peak value
Voltage Sensor Input (Asymmetrical) Input Current Range Pins FOUT1, FOUT2 Output Low Voltage Output High Voltage Pulse Rate FOUT1 FOUT21 IIV VOL VOH fP fP2 -25 +25 VSS+1 VDD-1 10 0.5 fP/290
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A V V Hz Hz
Peak value IOL = 5mA IOH = -2mA Specified linearity Min and max limits
1160 3000
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SA9122E ELECTRICAL CHARACTERISTICS (Continued) Parameter Symbol Min Typ Max Unit Condition Oscillator Recommended crystal: TV colour burst crystal f = 3.5795 MHz Pin VREF Ref. Current Ref. Voltage LCD backplane Voltage -IR VR VB Vs 45 1.1 50 VDD & VSS 1/3 VDD 2/3 VDD 55 1.3 A V With R = 24k connected to VSS Referred to VSS R[0] ... R[3] S[0] ... S[15]
V V
LCD segment Voltage Note1:
#
Two additional bondout options at FOUT2 are available on request: fp/4 and fp/16.
Extended Operating Temperature Range available on request. PIN DESCRIPTION
PLCC-44 11 18 3 8 10 9 42 41 14 15 16 17 4 5 6 7 13 2 44 43
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DIP-40 Designation 10 GND 16 VDD 2 VSS 7 IVN 9 IIN 8 IIP 38 OSC1 37 OSC2 12 CPON 13 CPOP 14 CPIN 15 CPIP 3 CIP 4 CIN 5 COP 6 CON 11 VREF 1 RX 40 FOUT2 39 FOUT1
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) 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 Serial data input Pulse rate outputs
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SA9122E PIN DESCRIPTION (Continued) PLCC-44 19 20 21 22 24 25 26 27 28 29 30 31 32 33 35 36 37 38 39 40 1 12 23 34 DIP-40 Designation 17 R[0] 18 R[1] 19 R[2] 20 R[3] 21 S[0] 22 S[1] 23 S[2] 24 S[3] 25 S[4] 26 S[5] 27 S[6] 28 S[7] 29 S[8] 30 S[9] 31 S[10] 32 S[11] 33 S[12] 34 S[13] 35 S[14] 36 S[15] NC NC NC NC Description Output drivers for LCD back planes
Output drivers for LCD segments
Not connected
FUNCTIONAL DESCRIPTION The SA9122E is a CMOS mixed signal Analog/Digital integrated circuit, which performs power/energy calculations across a power range of 1000:1, to an overall accurancy of better than Class 1, and includes a seperate 64 segment LCD display driver function. The integrated circuit includes all the required functions for 1-phase power and energy measurement 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. The SA9122E generates pulses, the frequency of which is proportional to the power consumption. Two frequency outputs (FOUT1 and FOUT2) are available, with additional frequency options available on request. The pulse rate follows the instantaneous power measured. The separate Liquid Crystal Display driver function included on-chip, drives up to 64 segments on a 4 track muliplexed backplane display, programmable via a serial interface having a RS232 protocol. sames
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SA9122E 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 200). This voltage is converted to a current of between 0 and 16A, by means of resistors R1 and R2. The current sense input saturates at an input current of 25A 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 14ARMS at nominal mains voltage, via resistor R4 (1M). In this configuration, with a mains voltage of 230V and a current of 80A, the output frequency of the SA9122E power meter chip at FOUT1 is 1.16kHz. In this case, 1 pulse will correspond to an energy consumption of 18.4kW/1160Hz = 15.9Ws. The output frequency at FOUT2 is FOUT1 /290 (i.e. The frequency ouput at FOUT1 divided by 290). 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
2.
IIN
CURRENT SENSOR INPUTS
V SS V DD
AI
IIP
V SS VDD
IVN VOLTAGE SENSOR INPUT
V SS
A
V
DR-00935
GND
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SA9122E 3. LCD Programming Protocol Programming of the SA9122E's on-chip Liquid Crystal Display memory is performed via a serial interface having a RS232 data format. The data for display is transferred on RX at 19 200 baud. The format of the data as well as the data memory map, is given below: Data format on RX
START DR-00937
A0
A1
A2
A3
D0
D1
D2
D3
STOP
LCD memory map Inserting a '1' into a memory location turns the segment on and a '0' turns the segment off. A3 A2 A1 A0 D3 D2 D1 D0 Pin 0 0 0 0 S[0] 0 0 0 1 S[1] 0 0 1 0 S[2] 0 0 1 1 S[3] 0 1 0 0 S[4] 0 1 0 1 S[5] 0 1 1 0 S[6] 0 1 1 1 S[7] 1 0 0 0 S[8] 1 0 0 1 S[9] 1 0 1 0 S[10] 1 0 1 1 S[11] 1 1 0 0 S[12] 1 1 0 1 S[13] 1 1 1 0 S[14] 1 1 1 1 S[15] R[3] R[2] R[1] R[0]
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SA9122E 4. Electrostatic Discharge (ESD) Protection The SA9122E integrated circuit's inputs/outputs are protected against ESD according to Mil-Std 883C, method 3015. Power Consumption The power consumption rating of the SA9122E integrated circuit is less than 25mW.
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TYPICAL APPLICATIONS In the Application Circuit (Figure 1), the components required for this power metering application, 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. The most important external components for the SA9122E 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 16ARMS into the SA9122E at maximum line current. Values for RSH of less than 200 should be avoided. R1 = R2 = (IL/16ARMS) * RSH/2 = Line current Where IL 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 14ARMS. R7 defines the reference current (IR). With R7 = 24k, 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%).
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SA9122E
The formula for calculating the output frequency is given below: f = 11.16 * FOUTX * Where FOUTX FOSC II IV IR FOSC 3.58MHz * II .IV IR2
= Normal rated frequency (4Hz or 1160Hz) = Oscillator frequency (2MHz ...... 4MHz) = Input current for current sensor input (16A at rated line current) = Input current for voltage sensor input (14A at rated line voltage) = Reference current (typically 50A)
XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator frequency is divided down to 1.7897 MHz on-chip, to supply the digital circuitry and the A/D converters.
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RSH
R7
R8
-2.5V
R9
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SA9122E
LOAD
RX
1 40 39
FOUT1 FOUT2
FROM MICROCONTROLLER
TO MICROCONTROLLER
V SS
2 3 38
C4 XTAL
4 37 36 35 34 33
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
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C2
6 5
R4
7 8 9 10 11 30 29 28
. . . . . . . . . . . . . .
R1 R2
32 31
SA9122E IC-1
R6
12 13
C1 R3 C3
15 26 25 24 23 22 21 14 27
LCD
. .
R0 R1 R2 R3
+2.5 C5
18 19
V DD
16 17
C7
C6
20
DR-00936
SUPPLY
SA9122E Parts List for Application Circuit: Figure 1 Item Symbol Description 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 IC-1 XTAL R1 R2 R3 R4 R6 R7 R8 R9 C1 C2 C3 C4 C5 C6 C7 LCD RSH SA9122E Crystal, 3.5795MHz Resistor, 1% metal Resistor, 1% metal Resistor, 390k, (230VAC) 1%, metal Resistor, 1M, 1/4W, 1%, metal Resistor, 24k, 1/4W, 1%, metal Resistor, 24k, 1/4W, 1%, metal Resistor, 820, 1/4W, 1% Resistor, 820, 1/4W, 1% Capacitor, 560pF Capacitor, 560pF Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 100nF Capacitor, 100nF Capacitor, 820nF LCD 64 Segment, 4 back plane Shunt Resistor
Detail DIP-40/PLCC-44 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 (C7) 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.
ORDERING INFORMATION Part Number Package SA9122EPA DIP-40 SA9122EFA PLCC-44
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SA9122E
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: Fax:
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012 333-6021 012 333-8071 sames
Tel: Fax:
Int +27 12 333-6021 Int +27 12 333-8071

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