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FEATURES
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SA9110A MONOCHIP THREE PHASE BIDIRECTIONAL KILOWATT HOUR METERING IC
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Performs bidirectional energy metering and directly drives a LCD with 7 digits plus announciators 4 externally selectable on-chip tariff registers An additional total energy register Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters Optical interface for electronic reading according to IEC1107 Mode D
Pulse output for calibration Total power consumption rating below 40mW Adaptable to different types of current sensors Operates over a wide temperature range Precision voltage reference on-chip Protected against ESD
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DESCRIPTION The SAMES SA9110A Three Phase bidirectional energy metering integrated circuit has an integrated Liquid Crystal Display (LCD) driver for a 7 digit (7 segment) display as well as 4 multiple tariff registers. The SA9110A performs the active power calculation. The method of calculation takes the power factor into account. The measured energy is displayed in kilo Watt hours (kWh). The SA9110A is capable of driving a display having a resolution of 1/10 kWh. This innovative universal energy metering integrated circuit is ideally suited for energy measurement in three phase systems. The SA9110A integrated circuit is available in a 68 pin plastic leaded chip carrier (PLCC-68) package type.
4365
PIN CONNECTIONS
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44
TP61 SDO PCLK PDTA PGM PB SR[0] SR[1] V DD V SS VREF CON3 COP3 IVP3 IVP2 IVP1 TP9
61 62 63 64 65 66 67 68 1 2 3 4 5 6 7 8 9
OSC1 OSC2 S[13] S[12] S[11] S[10] S[9] S[8] S[7] S[6] S[5] S[4] S[3] S[2] S[1] S[0] TP44
43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
COFF R[3] R[2] R[1] R[0] VBA V SS CINP CIPP CONP COPP IIP3 IIN3 IIP2 IIN2 IIP1 IIN1
DR-00952
TP10 TP11 GND TP13 COP2 CON2 CON1 COP1 CIP1 CIN1 CIP2 CIN2 CIP3 CIN3 TP24 V DD TP26
Package: PLCC-68
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PDS039-SA9110A-001 REV. B 28-08-1996
SA9110A BLOCK DIAGRAM
16 CONNECTIONS FOR LOOPCAPS SDO VBA R[0] R[1] R[2] R[3] V DD V SS
IVP1 IVP2 IVP3 IIP1 IIN1 ANALOG SIGNAL PROCESSING
SERIAL OUT INTERFACE
TARIFF REGISTERS LCD CONTROL INTEGRAT. & PULSE RATE GENERATION
IIP2 IIN2
IIP3 IIP2 GND VREF REF TIMING & CONTROL OSC
S[0] S[1] S[2] S[3] S[4] S[5] S[6] S[7] S[8] S[9] S[10] S[11] S[12] S[13] COFF
OSC1 OSC2
DR-00953
PGM
PB
PDTA PCLK SR[0] SR[1]
ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Supply Voltage VDD -VSS Current on any pin IPIN Storage Temperature T STG Operating Temperature TO
Min -0.3 -150 -40 -10
Max 6.0 +150 +125 +70
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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SA9110A ELECTRICAL CHARACTERISTICS (Over the temperature range -10C to +70C#, unless otherwise specified.) Parameter Supply Voltage Supply Current Nonlinearity of power calculation Symbol VDD-VSS IDD Min 4.5 Typ Max 5.5 15 +0.3 Unit V mA % 1% - 100% of rated power Peak value Peak value R[0] .. R[3] S[0] .. S[15] Default1 Programmed1 IOL = 5mA IOH = -2mA Condition
-0.3
Current Sensor Inputs (Differential) Input Current Range III Voltage Sensor Inputs (Asymmetric) Input current Range IIV LCD backplane Voltage VB LCD segment Voltage Pin SDO Pulse rate Output Voltage Low Output Voltage High Oscillator Pin VREF Ref. Current Ref. Voltage Pins PB, SR[0], SR[1], PGM Input Voltage High Input Voltage Low Pullup Current Pin PCLK Input Voltage High Input Voltage Low Input Current High/ Low Pin VBA VS
-25 -25
VDD & VSS 1/3 VDD 2/3VDD
+25 +25
A A V V Hz Hz V V
fP
3.5
80 V OL VSS+1 V OH VDD-1 Recommended crystal: TV colour burst crystal f = 3.5795 MHz With R7 = 24k -I R 45 50 55 A connected to VSS VR 1.1 1.3 V Referred to VSS
VIH VIL
4 1 30
V V A V V A nA V
VIN = VSS
VIH VIL
4 1 30
VIN=VSS ..VDD Power down mode
IMAX V MIN
50 1.1
#
Extended Operating Temperature Range available on request Note 1: At rated conditions sames
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SA9110A PIN DESCRIPTION
Pin 12 1 25 2 37 38 8 7 6 27 28 29 30 31 32 60 59 39 40 41 42 45 46 47 48 49 50 51 52 53 54 55 56 57 58 43 Designation GND VDD VDD VSS VSS VBA IVP1 IVP2 IVP3 IIN1 IIP1 IIN2 IIP2 IIN3 IIP3 OSC1 OSC2 R[0] R[1] R[2] R[3] S[0] S[1] S[2] S[3] S[4] S[5] S[6] S[7] S[8] S[9] S[10] S[11] S[12] S[13] COFF Type Supply Supply Supply Supply Supply Supply Analog in Analog in Analog in Analog in Analog in Analog in Analog in Analog in Analog in Input Output Output Output Output Output Output Output Output Output Output Output Output Output Output Output Output Output Output Output Output Description Ground Positive Supply Voltage Negative Supply Voltage Battery back-up. Negative Supply Voltage Input for voltage sense : Phase 1 Input for voltage sense : Phase 2 Input for voltage sense : Phase 3 Inputs for current sensor : Phase 1 Inputs for current sensor : Phase 2 Inputs for current sensor : Phase 3 Connections for crystal or ceramic resonator (OSC1 = Input; OSC2 = Output) Liquid crystal display (LCD) backplane drivers
Liquid crystal display (LCD) segment drivers
Connection for all unused LCD segments, to ensure off status
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SA9110A PIN DESCRIPTION (continued)
Pin 16 17 15 14 4 5 34 33 19 18 21 20 23 22 36 35 3 62 67 68 66 65 Designation CON1 COP1 CON2 COP2 CON3 COP3 CONP COPP CIN1 CIP1 CIN2 CIP2 CIN3 CIP3 CINP CIPP VREF SDO SR[0] SR[1] PB PGM Type Analog Analog Analog Analog Analog Analog Analog Analog Analog Analog Analog Analog Analog Analog Analog Analog Analog Open drain Input Input Input Input Description Connections for outer loop capacitors of A/D converters
Connections for inner loop capacitors of A/D converters
Connection for reference current setting resistor Pulse rate output. Serial data output when PB is low Control for tariff register selection (on-chip pull-up) Control for tariff register selection (on-chip pull-up) Push Button: Display select/start serial data transmission on SDO (on-chip pull-up) Programming Mode . It is recommended that pin PGM be connected to VDD via a 470 resistor to guard
against transients or noise.
64 63 9 10 11 13 24 26 44 61 PDTA PCLK TP9 TP10 TP11 TP13 TP24 TP26 TP44 TP61 Input Input Programming Data (on-chip pull-down) Programming Clock Manufacturer's test pins (Leave unconnected)
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SA9110A FUNCTIONAL DESCRIPTION The SA9110A is a CMOS mixed signal Analog/Digital integrated circuit, which performs three phase energy calculations across a power range of 1000:1, to an overall accurancy of better than Class 1. An on-chip LCD driver directly drives a 7 digit (7 segment) LCD. Also included on-chip, are 4 x tariff registers externally selectable for multi-tariff energy metering applications and a fifth register which retains the total energy consumption. The integrated circuit includes all the required functions such as two oversampling A/D converters for the voltage and current sense inputs, power calculation and energy integration. Offset is eliminated through the use of internal cancellation procedures. 1. Power Calculation In the Application Circuit (Figure 1), the mains voltage from Line 1, Line 2 and Line 3, are converted to currents and applied to the voltage sense inputs IVP1, IVP2 and IVP3. The current levels on the voltage sense inputs are derived from the mains voltage (3 x 230 VAC) being divided down through voltage dividers to 14V. The resulting input currents into the A/D converters are 14A through the resistors R15, R16 and R17. For the current sense inputs the voltage drop across the current transformers terminating resitors are converted to currents of 16A for rated conditions, by means of resistors R8, R9 (Phase 1); R10, R11 (Phase 2) and R12, R13 (Phase 3). The signals providing the current information are applied to the current sensor inputs IIN1, IIP1, IIN2, IIP2 and II3, IIP3. A pulse rate output for calibration purposes is available on SDO (Pin 62), the pulse rate being proportional to the active energy consumption. The integrated anti-creep function ensures no metering when no line current is present. 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.
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SA9110A
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-00954
3.
LCD Driver The SA9110A has an on-chip LCD driver capable of driving a 4 backplane, 7 digit (7 segment) display, as well as 6 announciators. The backplane repitition frequency is approximately 90Hz. The most significant digit is addressed by columns S[13] and S[12] and the least significant digit by S[1] and S[0]. Announciators for the total register, 4 tariff registers and energy direction indication are available on the 'h' segments of the 6 least significant digits. The display segments are addressed via the column outputs given in the table below:
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SA9110A LCD Segment Address Table Digit 10-1 LSD 100 101 102 103 104 105 MSD Column S[0] S[1] S[2] S[3] S[4] S[5] S[6] S[7] S[8] S[9] S[10] S[11] S[12] S[13] R[0] Total d T4 d T3 d T2 d T1 d Dir d h d R[1] c e c e c e c e c e c e c e R[2] b g b g b g b g b g b g b g R[3] a f a f a f a f a f a f a f
LCD Layout The LCD display is given in the diagram below:
R[3]
b . c h d .
a
f g. e
4
6
. .
7
.
R[1]
R[0]
T4
S[13] S[12] S[3] S[2]
TOTAL
S[1] S[0]
COLUMNS
DR-00955
The kWh values of the LCD display digits, are given in the table below. The resolution of the Least Significant Digit is normally programmed to 0.1kWh: 105
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104
103
102
101
100
10-1
kWh
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BACKPLANES
R[2]
SA9110A 4. Device Programming The SA9110A contains on-chip registers which enables the meter manufacturer to store various data: Slope Adjustment The slope of the device may be adjusted by programming a slope constant (KS) into the device during calibration. The output frequency at SDO (fP) is calculated by means of the following formula: FOSC 40062.5 (II1 * IV1 ) + (II2 * I V2) + (II3 * IV3) fP = 11.16 * * * 3.5795MHz KS 3 * IR2 Where FOSC = Oscillator frequency (2MHz ...... 4MHz) II1, II2, II3 = Input current for current sensor input (16A at rated line current) IV1, IV2, IV3 = Input current for voltage sensor input (14A at rated line voltage) IR = Reference current (typically 50A) KS = Slope constant (1025 ... 16384) (The default value is 11389) By changing the slope of the device the resolution of the LCD together with the pulse rate on SDO may be changed by up to an order. The block diagram below illustrates the display update rate. Programmable slope divider
40062.5* Pulses / s 1/K s 1 / 64 Display Increment fp
DR-00956
* At rated conditions The display is incremented after every 64th pulse on SDO. Display Resolution From the above formula for fp it can be derived that the slope constant, Ks, is given by the following expression:Ks = (626 * 3600 * 1000 * EKWh) / ( 3 * VL * IL) Where EkWh = energy for 1 Display increment in kWh VL = rated line voltage IL = rated line current This formula is valid only if 16A flows into each of the current sense inputs for rated line current (IL) and 14A flows into the voltage sense inputs for rated line voltage (VL). 9/18 sames
SA9110A
Offset Adjustment The precision of this device does not require any offset adjustment for Class 1 metering. This facility has been provided to compensate for poor PCB layout or circumstances requiring precision well beyond a Class 1 rating. The offset of the device may be adjusted by programming a different offset into the device during calibration. To calaculate the offset the following procedure should be followed: Measure the linearity error at the current where offset correction is needed. IM * ERR KO = IR * 6 * 10-6
IM = Measured current on the current sensor IR = Rated current on the current sensor ERR = Error ratio between the device and the Wh standard KO = Offset constant (-127 ... 127) Note that KO must be programmed as a integer value. Where
Meter/Manufacturers Identification Data A total of eleven 4 bit words are available to store relevant data such as the meter and manufacturer identification codes. For the optical interface protocol, the 4-bit words are converted to 8-bit words (ASCII-format). Writing to RAM The memory is configured as ten 32 bit words. The programming data must be written to the device as a bitstream containing a total of 320 bits. ROM-locations will not be overwritten.
Word number 1 1 2 2 3 3 4 4 5 Bit number 31..28 27..0 31..28 27..0 31..28 27..0 31..28 27..0 31..28 Function Sign of Register 1 Register 1 Sign of Register 2 Register 2 Sign of Register 3 Register 3 Sign of Register 4 Register 4 Sign of Register 'Total' Description A '1' indicates a negative register value Contents of register 1 in binary coded decimal A '1' indicates a negative register value Contents of register 2 in binary coded decimal A '1' indicates a negative register value Contents of register 3 in binary coded decimal A '1' indicates a negative register value Contents of register 4 in binary coded decimal A '1' indicates a negative register value
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SA9110A
Word Bit Function number number 5 6 6 7 7 8 9 9 9 9 9 9 9 10 27..0 31..16 15..0 31..28 27..0 31..0 31 30..25 24-22 21 20..14 13 12..0 31..0 Register 'Total' ROM Manufacturers Identification ROM System Identification ROM Programmed slope select ROM SAMES defined register Sign of offset Offset Sign of slope Slope ROM Description Registers 1, 2, 3 and 4 are added and stored in the register 'Total' Don't care 16 bits are available for the manufacturer of the metering system as a system identification Don't care 28 bits are available for the manufacturer of the metering system as a system identification Don't care Programmed slope select bit must be set if the default slope in ROM is not used Don't care Bits must be set to 0 for correct functionality By setting the sign bit a negative value is indicated Offset of the device in binary By setting the sign bit a negative value is indicated Slope of the device in binary. (default = 11389) Don't care
The first bit of the programming data is written to word number 1, bit 31. The last bit is written to word number 10, bit 0.
PGM PCLK PDTA BIT-N0 WORD-NO
DR-00957
31 1
30 1
29 1
28 1
27 1
26 1
25 1
24 1
23 1
0 10
Programming procedure: The PGM pin is pulled low and the PCLK pin should be clocked with an external clock. The programming data on the PDTA pin must be stable during the rising edge of the clock signal on PCLK. The clock signal on PCLK should not exceed 200 kHz and does not have to be synchronised with the oscillator frequency (FOSC). Programming mode is interrupted if PGM goes high. sames
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SA9110A
Memory Reset In programming mode (while PGM is pulled low) if PCLK is left floating and PDTA=0, the internal clock of the SA9110A will ensure that default values are set. For default conditions all of the RAM locations are set to 0 and the value of the slope is set to 11389. The minimum time period for a complete reset cycle is determined by: tmin = 322 * 64 FOSC Where FOSC = Oscillator frequency (2MHz.....4MHz) If the recommended crystal frequency of 3.5795MHz is used, this will result in a minimum reset time of 5.8ms. The specified signal levels on pins PGM, PCLK and PDTA must remain stable for the entire reset cycle period.
5.
Tariff Registers A multiple tariff facility is provided on-chip by means of 4 tariff registers, which are externally selectable via the SR[0] and SR[1] inputs. The registers may be selected by programming the SR[0] and SR[1] inputs as follows: SR[1] 0 0 1 1 SR[0] 0 1 0 1 Register Register 1 Register 2 Register 3 Register 4
The 4 tariff registers as well as the total register may be sequentially displayed by activating the Push Button (PB). The minimum Push Button make time is 5mS. The contents of the register selected for display is retained on the display for a period of 10 seconds, provided that the push button is not activated during this period. After the 10 seconds has elapsed, the display defaults to the "active" register defined by the status of the SR[0] and SR[1] inputs. The register selected for display via the push button (PB) is indicated by the relevant announciator.
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SA9110A 6. Optical Interface The SA9110A device contains an interface for automatic meter reading, according to the IEC1107 Mode D standard. The IEC1107 Mode D is a single baud rate of 2400. For the optical interface protocol, the 4-bit words are converted to 8-bit words (ASCII-format). After initiation of a serial transmission by pulling PB (pin 66) low, the data format transmitted on SDO, is given below: Code / XXX 3 YYYYYYYY 0(nnnnnnnn) 1(nnnnnnnn) 2(nnnnnnnn) 3(nnnnnnnn) 4(nnnnnnnn) ! 7. Description Start transmission ID Baud rate identification ID Data header Data of Reg. 1 (sign, 10e 5, 10e4 ...10e0, 10e-1) Data of Reg. 2 Data of Reg. 3 Data of Reg. 4 Data of Reg. 'Total' = Sum of registers 1 to 4 End transmission
Power Failure/Battery Backup A battery backup facility is available on VBA. This feature is provided to ensure retention of the information stored in the registers, in case of power breaks. The VSS supply to the analog circuitry and digital circuitry has been separated. In the event of a power failure, the supply to the analog circuitry falls to 0V. The digital circuitry is switched to a power down mode, to minimise the supply current from an external battery backup. During this procedure, the following events take place: * All inputs are disabled * All outputs are placed in high impedance mode * The oscillator is inhibited * The LCD driver is disabled * The contents of the RAM is retained by means of an external power source. Electrostatic Discharge (ESD) Protection The SA9110A integrated circuits inputs/outputs are protected against ESD. Power Consumption The power consumption rating of the SA9110A integrated circuit is less than 40mW with a 5V supply. sames
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8.
9.
SA9110A TYPICAL APPLICATION In the Application Circuit (Figure 1), the components required for a three phase power metering application are shown. Terminated current transformers are used for current sensing. The most important external components for the SA9110A integrated circuit are: C7, C9, C10 and C 11 are the outer loop capacitors for the integrated oversampling A/D converters. The typical value of C7 is 2.2nF and the value of C9, C10 and C11 is 560pF. The actual values determine the signal to noise and stability performance. The tolerances should be within 10%. C4, C5, C6 and C8 are the inner loop capacitors for the integrated oversampling A/D converters. The typical value of C4, C5, C 6 and C 8 is 3.3nF. Values smaller than 0.5nF and larger than 5nF should be avoided. Terminated current sensors (current transformers) are connected to the current sensor inputs of the SA9110A through current setting resistors (R8 ..R13). The resistor values should be selected for an input current of 16ARMS into the SA9110A, at the rated line current. The values of these resistors should be calculated as follows: Phase 1: R8 = R9 = (IL1/16A RMS) * R 18/2 Phase 2: R10 = R11 = (IL2/16ARMS) * R19/2 Phase 3: R12 = R13 = (IL3/16ARMS) * R20/2 Where ILX = Secondary CT current at rated conditions. R18, R19 and R20 = Current transformer termination resistors for the three phases. R1 , R4 and R15 set the current for the phase 1 voltage sense input. R2 , R5 and R16 set the current for phase 2 and R3 , R6 and R17 set the current for phase 3. The values should be selected so that the input currents into the voltage sense inputs (virtual ground) are set to 14A RMS for nominal line voltage. Capacitors C1, C2 and C3 are for decoupling and phase compensation. R7 defines all on-chip bias and reference currents (IR ). With R7 = 24k, optimum conditions are set. R7 may be varied within 10% for calibration purposes. Any changes to R7 will affect the output quadratically (i.e: R = +5%, f = +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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SUPPLY TARIFF SELECT DIPSW R23 5V
DISPLAY SELECT C3 C2 C1
9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61
PBUT
R3 R16 R15 C11 LED R14 5V R7 5V
R17
R2
PGM PDTA PCLK
Figure 1: Application circuit using current transformers for current sensing.
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XTAL R4
10 11 58 57 56 12 13 14 15 16 17 18 19 20 49 48 47 46 45 44 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 51 50 53 52
. . . . . . . . . . .
R1
R6 R5
60 59
SA9110A IC - 1
55 54
LCD
. . .
C10 C9 C6 C5 5V C4
NEGATIVE T1 T2 T3 T4 TOTAL
CT1 R9 R10 R11 R12 R13 D1 D2 C7 C8
R18 R8
5V C13 C12 R21
CT2
R19
CT3
R20
BAT
C14 R22
SA9110A
N L3 L2 L1 LOAD
DR-00939
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SA9110A 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 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
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Symbol IC-1 XTAL R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 BAT
Description SA9110AFA Crystal, 3.5795 MHz Resistor, 390k, 1%, 1/4W Resistor, 390k, 1%, 1/4W Resistor, 390k, 1%, 1/4W Resistor, 24k, 1%, 1/4W Resistor, 24k, 1%, 1/4W Resistor, 24k, 1%, 1/4W Resistor, 24k, 1%, 1/4W Resistor Resistor Resistor Resistor Resistor Resistor Resistor, 820, 1%, 1/4W Resistor, 1M, 1%, 1/4W Resistor, 1M, 1%, 1/4W Resistor, 1M, 1%, 1/4W Resistor Resistor Resistor Resistor, 820, 1%, 1/4W Resistor, 820, 1%, 1/4W Resistor, 470 Capacitor, electrolytic, 1F, 16V Capacitor, electrolytic, 1F, 16V Capacitor, electrolytic, 1F, 16V Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 3.3nF Capacitor, 2.2nF Capacitor, 3.3nF Capacitor, 560pF Capacitor, 560pF Capacitor, 560pF Capacitor, 100nF Capacitor, 820nF Capacitor, 100nF Battery (1.2V)
Detail PLCC-68 Colour burst TV Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note Note Note Note Note Note Note Note Note Note Note Note 2 2 2 2 2 2 1 1 1 2 2 2
Note 3 Note 3 Note 3
Note 4
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SA9110A Parts List for Application Circuit: Figure 1 (Continued)
Item 41 42 43 44 45 Symbol LED D1 D2 DIPSW PBUT Description Light emmitting diode Diode, Shottkey Diode, 1N4148 DIP swich, 2 poles Push button Detail
Note 1 : Resistor values are dependant upon the rated mains voltage (230V in this case) Note 2 : Resistor (R8, R9, R10, R11, R12 and R13) values are dependant upon the selected values of the current transformer termination resistors R18, R19 and R20. Note 3 : Capacitor values may be selected to compensate for phase errors caused by the current transformers. Note 4 : Capacitor (C13) to be positioned as close to supply pins (VDD & VSS ) of IC-1, as possible.
ORDERING INFORMATION Part Number SA9110AFA Package PLCC-68
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SA9110A
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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