sames
SA9109B
MONOCHIP SINGLE PHASE BIDIRECTIONAL
KILOWATT HOUR METERING IC
Pulse output for calibration
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
n
n
n
n
n
PIN CONNECTIONS
PCLK
PDTA
PGM
PB
SR[0]
SR[1]
VBA
V SS
CIP
CIN
COP
OSC2
S[13]
S[12]
S[11]
S[10]
S[9]
S[8]
S[7]
S[6]
DESCRIPTION
The SAMES SA9109B Single 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 SA9109B performs the active power
calculation.
The method of calculation takes the power
factor into account.
Two methods of energy measurement are
available. One method results in energy
values which take the direction of energy
flow into account, a summation of signed
integers. The alternative method measures energy regardless of the direction of
energy flow, a summation of absolute
values. The required measurement
method may be selected when writing to
the RAM of the device.
n
39
37
36
35
34
33
32
31
30 29
40
28
41
27
42
26
43
25
44
24
23
1
2
22
3
21
4
20
5
19
6
18
7
DR-01252
38
8
9
10
11
12
13 14
15
16
S[5]
S[4]
S[3]
S[2]
S[1]
S[0]
COFF
R[3]
R[2]
R[1]
R[0]
17
IIN
GND
VREF
CPON
CPOP
CPIN
CPIP
V DD
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
Optical interface for electronic reading
according to IEC1107 Mode D
SDO
OSC1
n
n
CON
IVN
IIP
FEATURES
n
Performs bidirectional energy metering and directly drives a LCD with 7
digits display plus announciators
n
Programable method of energy addition
n
Pin compatible with SAMES SA9109A
n
4 externally selectable on-chip tariff
registers
n
An additional total energy register
Package: PLCC-44
1/16
4482
PDS039-SA9109B-001
REV. B
13-06-1997
SA9109B
DESCRIPTION (continued)
The measured energy is displayed in kiloWatt hours (kWh). The SA9109B 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 single phase systems.
The SA9109B integrated circuit is available in a 44 pin plastic leaded chip carrier (PLCC44) package type.
BLOCK DIAGRAM
V BA
R[0] R[1] R[2] R[3]
S D0
CIP
CON
V SS
S [0]
SERIAL
OUT
INTERFACE
CIN
V DD
S [1]
S [2]
COP
S [3]
S [4]
TARIFF
REGISTERS
IV N
GND
ANALOG
SIGNAL
PROCESSING
IIP
S [5]
S [6]
LCD
S [7]
CONTROL
S [8]
S [9]
IIN
INT EG RAT .
&
P UL S E
RAT E
G ENE RAT IO N
CPOP
CPON
CPIN
S [10]
S [11]
S [12]
S [13]
COFF
OSCI
V RE F
DR-01253
2/18
TIMING & CONTROL
REF
sames
P GM
PB
P DTA
P CLK
OSC
S R[0]
S R[1]
OSC2
SA9109B
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 -10°C to +70°C#, unless otherwise
specified.)
Parameter
Symbol Min
Operating temperature
range #
To
Supply Voltage: Positive
VDD
Supply Voltage: Negative
VSS
Supply Current: Positive
IDD
Supply Current: Negative
ISS
Current Sensor Inputs (Differential)
Input Current Range
III
Voltage Sensor Inputs (Asymmetric)
Input current Range
IIV
LCD backplane Voltage
VB
Typ
Max
Unit Condition
7
7
+85
2.75
-2.25
10
10
°C
V
V
mA
mA
+25
µA
+25
µA
-25
2.25
-2.75
-25
-25
VDD &
VSS
V
R[0] ... R3]
V
S[0] ...S[15]
LCD segment Voltage
VS
1/3VDD
2/3VDD
Pin SDO
Pulse rate
fP
3.5
Pulse width
Output Low Voltage
Output High Voltage
Oscillator
tp
VOL
VOH
4.3
VDD-1
35
5.9
VSS+1
Hz Default1
Hz Programmed1
mS
V
IOL = 5mA
V
IOH = -2mA
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
sames
3/18
SA9109B
ELECTRICAL CHARACTERISTICS (continued)
Parameter
Symbol Min
Typ
Max
Pin VREF
Ref. Current
Ref. Voltage
55
1.3
µA
V
With R7 = 24kΩ
connected to VSS
Referred to VSS
1
V
V
µA
VIN = VSS
V
V
µA
VIN=VSS..VDD
nA
V
Power down
mode
-IR
VR
45
1.1
VIH
VIL
4
50
Unit Condition
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
30
VIH
VIL
4
1
±30
IMAX
VMIN
1.1
50
5.5
#
Extended Operating Temperature Range available on request
Note 1: At rated conditions
PIN DESCRIPTION
Pin
11
17
3
2
8
10
9
38
37
18
19
20
21
4/18
Designation
GND
VDD
VSS
VBA
IVN
IIN
IIP
OSC1
OSC2
R[0]
R[1]
R[2]
R[3]
Type
Supply
Supply
Supply
Supply
Analog in
Analog in
Analog in
Input
Output
Output
Output
Output
Output
sames
Description
Ground
Positive Supply Voltage sense
Negative Supply Voltage sense
Battery back-up. Negative Supply Voltage
Analog input for Voltage
Analog input for Current
Connections for crystal or ceramic resonator
(OSC1 = Input; OSC2 = Output)
Liquid crystal display (LCD) backplane drivers
SA9109B
PIN DESCRIPTION (continued)
Pin
Designation
Type
23
24
25
26
27
28
29
30
31
32
33
34
35
36
22
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
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
7
6
5
4
16
15
14
13
12
39
44
1
43
CON
COP
CIN
CIP
CPIP
CPIN
CPOP
CPON
VREF
SDO
SR[0]
SR[1]
PB
42
PGM
41
40
PDTA
PCLK
Description
Liquid crystal display (LCD) segment drivers
Connection for all unused LCD segments, to ensure
off status
Analog
Connections for outer loop capacitor of A/D
Analog
converter (Current)
Analog
Connections for inner loop capacitor of A/D
Analog
converter (Current)
Analog
Connections for inner loop capacitor of A/D
Analog
converter (Voltage)
Analog
Connections for outer loop capacitor of A/D
Analog
converter (Voltage)
Analog
Connection for reference current setting resistor
Open drain Pulse rate output. Serial data output when PB is low
Input
Control for tariff register selection (on-chip pull-up)
Input
Control for tariff register selection (on-chip pull-up)
Input
Push Button: Display select/start serial data
transmission on SDO (on-chip pull-up)
Input
Programming Mode. It is recommended that pin PGM be
connected to VDD via a 470Ω resistor to guard against
transients or noise
Input
Programming Data (on-chip pull-down)
Input
Programming Clock
sames
5/18
SA9109B
FUNCTIONAL DESCRIPTION
The SA9109B is a CMOS mixed signal Analog/Digital integrated circuit, which performs
power 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 display. Also
included on-chip, are 4 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.
2.
6/18
Power Calculation
In the Application Circuit (Figure 1), the voltage drop across the shunt will be
between 0 and 16mVRMS (0 to 80A through a shunt resistor of 200µΩ). This voltage
is converted to a current of between 0 and 16µA RMS, by means of resistors R1 and
R2.
The current sense input saturates at an input current of ±25µA peak.
The voltage level from the mains is divided down through a divider to 14V.This
voltage is converted to a signal current of 14µA RMS into the voltage sensor input.
A pulse rate output for calibration purposes is available on SDO (Pin 39), the pulse
rate being proportional to the active energy consumption.
The integrated anti-creep function ensures no metering when no line current is
present.
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.
sames
SA9109B
V DD
IIN
CURRENT
S E N S OR
IN P U TS
V SS
AI
V DD
IIP
V SS
V DD
IV N
V O LTA G E
S E N S OR
IN P U T
V SS
AV
GN D
DR-01254
3.
LCD Driver
The SA9109B has an on-chip LCD driver capable of driving a 4 backplane, 7 digit
(7 segment) display, as well as 6 announciators.
The backplane repetition 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 4 tariff registers, the total
register and energy direction are available on the `h' segment of the 6 least
significant digits. The display segments are addressed via the column outputs given
in the table below:
sames
7/18
SA9109B
LCD Segment Address Table
Digit
10-1
LSD
100
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]
101
102
103
104
105
MSD
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]
g.
6
b
.
.
e
7
.
.
R [2]
.
R [1]
c
h
d
R [0]
T4
S[13]
S[12]
S[3]
C OLU M N S
DR-01255
8/18
sames
TOTAL
S[2]
S[1]
S[0]
B AC K PLAN ES
4
f
SA9109B
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
4.
104
103
102
101
100
10-1
kWh
Device Programming
The SA9109B 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
II .IV 40062.5
fP = 11.16 *
*
*
3.5795MHz
IR2
KS
Where
FOSC
= Oscillator frequency (2MHz ...... 4MHz)
II
= Input current for current sensor input (16µA at rated line current)
IV
= Input current for voltage sensor input (14µA at rated line voltage)
IR
= Reference current (typically 50µA)
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*
P ulses / s
1/K s
1 / 64
D R -0 1 2 5 6
D isplay
Incr em ent
fp
* At rated conditions
The display is incremented after every 64th pulse on SDO.
sames
9/18
SA9109B
Display resolution
From the above formula for f P it can be derived that the slope constant, Ks, is given
by the following expression:
626 * 3600 * 1000 * EkWL
KS =
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 16µARMS flows into the current sense input for rated line
current (IL) and 14µARMS flows into the voltage sense input for rated line voltage (VL).
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 calculate 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
*
Where
IM
IR
ERR
KO
=
=
=
=
Measured current on the current sensor
Rated current on the current sensor
Error ratio between the device and the Wh standard
Offset constant (-127 ...127)
(The default value is 0)
Note that KO must be programmed as a integer value.
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.
10/18
sames
SA9109B
Word
Bit
Function
number number
1
31..28 Sign of Register 1
Description
A '0' indicates a negative register value
1
27..0
Register 1
Contents of register 1 in binary coded decimal
2
2
31..28
27..0
Sign of Register 2
Register 2
A '0' indicates a negative register value
Contents of register 2 in binary coded decimal
3
31..28
Sign of Register 3
A '0' indicates a negative register value
3
27..0
Register 3
Contents of register 3 in binary coded decimal
4
31..28
Sign of Register 4
A '0' indicates a negative register value
4
27..0
Register 4
Contents of register 4 in binary coded decimal
5
31..28
Sign of Register
'Total'
A '0' indicates a negative register value
5
27..0
Register 'Total'
Registers 1, 2,3 and 4 are added and stored in the
register 'Total'
6
31..16
ROM
Don't care
6
15..0
Manufacturers
Identification
16 bits are available for the manufacturer of the
metering system as a system identification
7
31..28
ROM
Don't care
7
27..0
System
Identification
28 bits are available for the manufacturer of the
metering system as a system identification
8
31..0
ROM
Don't care
9
31
Programmed
slope select
Programmed slope select bit must be set if the
default slope in ROM is not used
9
30..26
ROM
Don't care
9
25
Summation
method select
0 to select addition which takes direction of
energy flow into account
1 to select addition which does not take direction
of energy flow into account
9
24..22
SAMES defined
Bits must be set to 0 for correct functionality
9
21
Sign of offset
By setting the sign bit a negative value is indicated
9
20..14
Offset
Offset of the device in binary
9
10
13..0
31..0
Slope
ROM
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.
sames
11/18
SA9109B
Programming procedure:
PGM
PCLK
PDTA
BIT-N0
W ORD-NO
31
1
30
1
29
1
28
1
27
1
26
1
25
1
24
1
23
1
0
10
DR-01257
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.
Memory Reset
In programming mode (while PGM is pulled low) if PCLK is left floating and
PDTA = 0, the internal clock of the SA9109B 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.
12/18
sames
SA9109B
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 and 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 announciators.
6.
Optical Interface
The SA9109B 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 34) low, the data format
transmitted on SDO is given below:
Code
/
XXX
3
YYYYYYYY
<cr><lf><cr><lf>
0(nnnnnnnn)
1(nnnnnnnn)
2(nnnnnnnn)
3(nnnnnnnn)
4(nnnnnnnn)
!<cr><lf><cr><lf>
sames
Description
Start transmission
ID
Baud rate identification
ID
Data header
Data of Reg. 1 (sign, 10e5, 10e4 ...10e0, 10e-1)
Data of Reg. 2
Data of Reg. 3
Data of Reg. 4
Data of Reg. 'Total' = Sum of registers 0 to 3
End transmission
13/18
SA9109B
7.
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 of this device 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.
8.
Electrostatic Discharge (ESD) Protection
The SA9109B integrated circuits inputs/outputs are protected against ESD.
Power Consumption
The power consumption rating of the SA9109B integrated circuit is less than 40mW.
9.
TYPICAL APPLICATION
In the Application Circuit (Figure 1), the components required for a single phase power
metering application are shown.
In Figure 1 a shunt resistor is used for current sensing. In the application, the circuitry
requires a +2.5V, 0V, -2.5V DC supply.
The most important external components for the SA9109B 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 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.
R1, R2 and RSH are the resistors defining the current level into the current sense input.
The values should be selected for an input current of 16µARMS into the SA9109A, at
maximum line current.
IL
RSH
*
R1 = R2 =
16µARMS
2
Where
14/18
IL
RSH
=
=
Line current
Shunt resistor
sames
SA9109B
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 14µARMS.
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 energy calculation quadratically.
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.
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
+ 2 .5 V
BAT
C6
C9
R 10
D1
R8
C7
C 10
R 11
0V
T A R IF F SE L EC T
R 12
D2
- 2 .5 V
LOA D
D IS PL A Y
SE LEC T
R7
C5
R3
- 2 .5 V
PG M
PD T A
PC L K
C4
R4
C2
6
R6
4
5
3
2
1
4 4 4 3 4 2 4 1 4 0
3 9
8
3 8
9
R1
3 7
IC - I
1 0
1 1
C1
R SH
C3
R2
R9
7
1 3
1 4
1 5
XT A L
3 6
3 5
3 4
1 2
SA 9109B
3 3
3 2
3 1
.
1 6
3 0
1 7
2 9
1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8
.
.
.
.
.
.
.
.
.
.
.
.
.
N E G A T IV E T 1 T 2 T 3 T 4 T O T A L
0V
D R -0 1 25 8
SU PPL Y
sames
15/18
SA9109B
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
Note 1:
Note 2:
Note 3:
Note 4:
16/18
Symbol
IC-1
XTAL
R1
R2
R3
R4
R6
R7
R8
R9
R10
R11
R12
RSH
C1
C2
C3
C4
C5
C6
C7
C9
C10
BAT
LED
D1
D2
PB
DIPSW
Description
SA9109B
Crystal 3.5795 MHz
Resistor, 1% metal
Resistor, 1% metal
Resistor, 390k, 1%, metal
Resistor, 1M, 1%, metal
Resistor, 24k, 1%, metal
Resistor, 24k, 1% metal
Resistor, 2M, 1%, metal
Resistor, 820Ω, 1%, metal
Resistor, 830Ω, 1%, metal
Resistor, 820Ω, 1%, metal
Resistor, 470Ω
Shunt resistor
Capacitor, 560pF
Capacitor, 560pF
Capacitor, 3.3nF
Capacitor, 3.3nF
Capacitor, 1µF
Capacitor, 100nF
Capacitor, 820nF
Capacitor, 100nF
Capacitor, 100nF
Battery (1.2V)
Light emitting diode
Diode, Shottkey
Diode, 1N4148
Push button
DIP switch, 2 poles
Detail
PLCC-44
Colour burst TV
Note 1
Note 1
Note 2
Note 2
Note 2
Note 3
Note 4
Resistor (R1 and R2) values are dependant upon the selected value of RSH.
Resistor (R3, R4 and R6) values are dependant upon the rated mains voltage
(230V in this case).
See TYPICAL APPLICATIONS when selecting the value of RSH.
Capacitor (C7) to be positioned as close as possible to VDD & VSS of IC-1.
sames
SA9109B
ORDERING INFORMATION
Part Number
SA9109BFA
Package
PLCC-44
sames
17/18
SA9109B
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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.
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[email protected]
For the latest updates on datasheets, please visit our web site:
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South African Micro-Electronic Systems (Pty) Ltd
P O Box 15888,
33 Eland Street,
Lynn East,
Koedoespoort Industrial Area,
0039
Pretoria,
Republic of South Africa,
Republic of South Africa
Tel:
Fax:
18/18
012 333-6021
012 333-8071
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Tel:
Fax:
Int +27 12 333-6021
Int +27 12 333-8071