sames
SA9109B
FEATURES
n
Performs bidirectional energy meter-
ing and directly drives a LCD with 7
digits display plus announciators
n
Programable method of energy addi-
tion
n
Pin compatible with SAMES SA9109A
n
4 externally selectable on-chip tariff
registers
n
An additional total energy register
n
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
1/16
4482
PDS039-SA9109B-001 REV. B
13-06-1997
Package: PLCC-44
MONOCHIP SINGLE PHASE BIDIRECTIONAL
KILOWATT HOUR METERING IC
DESCRIPTION
The SAMES SA9109B Single Phase bidi-
rectional energy metering integrated cir-
cuit has an integrated Liquid Crystal Dis-
play (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 meas-
ures 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.
PIN CONNECTIONS
n
Optical interface for electronic reading
according to IEC1107 Mode D
n
Pulse output for calibration
n
Power consumption rating below 40mW
n
Adaptable to different types of current
sensors
n
Operates over a wide temperature
range
n
Precision voltage reference on-chip
n
Protected against ESD
12
34
S
[
11]
VR
EF
3
VSS
DR-01252
CIP
CIN
COP
IV
N
8
7
CO
N
4
6
5
10
9
11
IIP
IIN
GN
D
PDTA
PGM
SR[0]
SR[1]
PB
VBA
PCLK
S
[
13]
S
[
12]
OS
C
1
OS
C
2
38
41
42
43
44
1
2
40
39
SD
O
37
35
36
21
R[3]
16
CP
I
P
15
14
13
CP
O
N
CP
O
P
CP
I
N
17
V
DD
18
19
20
R[2]
R[1]
R[0]
S
[
10]
S[
7
]
30
S[
9
]
S[
8
]
31
32
33
27
22
24
25
26
23
S[
6
]
28
29
S[4]
S[3]
S[2]
S[1]
COFF
S[0]
S[5]
SA9109B
2/18
sames
BLOCK DIAGRAM
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 (PLCC-
44) package type.
SERIAL
O UT
INTERFACE
TIMING & CONTROL
IN T E G RA T .
&
P UL S E
R AT E
G E NE RAT IO N
TARIFF
REGISTERS
DR-01253
V RE F
CPIN
CPON
CPOP
P GM
REF
P DTA
P B
COP
IV N
GND
IIN
IIP
CIN
CIP
CON
V BA
ANALO G
SIGNAL
PRO-
CESSING
S D0
S R[1]
S R[0]
P CLK
O SC
OSCI
OSC2
S [10]
S [13]
COFF
S [11]
S [12]
R[0]
LCD
CONTROL
DD
R[3]
R[1] R[2]
V
S [3]
S [4]
S [5]
S [6]
S [7]
S [8]
S [9]
S [0]
V SS
S [1]
S [2]
SA9109B
sames
3/18
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Min
Max
Unit
Supply Voltage
V
DD
-V
SS
-0.3
6.0
V
Current on any pin
I
PIN
-150
+150
mA
Storage Temperature
T
STG
-40
+125
C
Operating Temperature
T
O
-40
+85
C
* Stresses above those listed under "Absolute Maximum Ratings" may cause perma-
nent 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
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10C to +70C
#
, unless otherwise
specified.)
Parameter
Symbol
Min
Typ
Max
Unit
Condition
Operating temperature
range #
T
o
-25
+85
C
Supply Voltage: Positive
V
DD
2.25
2.75
V
Supply Voltage: Negative
V
SS
-2.75
-2.25
V
Supply Current: Positive
I
DD
7
10
mA
Supply Current: Negative
I
SS
7
10
mA
Current Sensor Inputs (Differential)
Input Current Range
I
II
-25
+25
A
Voltage Sensor Inputs (Asymmetric)
Input current Range
I
IV
-25
+25
A
LCD backplane Voltage
V
B
V
DD
&
V
SS
V
R[0] ... R3]
LCD segment Voltage
V
S
1/3V
DD
V
S[0] ...S[15]
2/3V
DD
Pin SDO
Pulse rate
f
P
3.5
Hz
Default
1
35
Hz
Programmed
1
Pulse width
t
p
4.3
5.9
mS
Output Low Voltage
V
OL
V
SS
+1
V
I
OL
= 5mA
Output High Voltage
V
OH
V
DD
-1
V
I
OH
= -2mA
Oscillator
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
SA9109B
4/18
sames
ELECTRICAL CHARACTERISTICS (continued)
Parameter
Symbol
Min
Typ
Max
Unit
Condition
Pin VREF
With R
7
= 24k
Ref. Current
-I
R
45
50
55
A
connected to V
SS
Ref. Voltage
V
R
1.1
1.3
V
Referred to V
SS
Pins PB, SR[0], SR[1],
PGM
Input Voltage High
V
IH
4
V
Input Voltage Low
V
IL
1
V
Pullup Current
30
A
V
IN
= V
SS
Pin PCLK
Input Voltage High
V
IH
4
V
Input Voltage Low
V
IL
1
V
Input Current High/
30
A
V
IN
=V
SS
..V
DD
Low
Pin VBA
I
MAX
50
nA
Power down
V
MIN
1.1
5.5
V
mode
#
Extended Operating Temperature Range available on request
Note 1: At rated conditions
Pin
Designation
Type
Description
11
GND
Supply
Ground
17
V
DD
Supply
Positive Supply Voltage sense
3
V
SS
Supply
Negative Supply Voltage sense
2
VBA
Supply
Battery back-up. Negative Supply Voltage
8
IVN
Analog in
Analog input for Voltage
10
IIN
Analog in
Analog input for Current
9
IIP
Analog in
38
OSC1
Input
Connections for crystal or ceramic resonator
37
OSC2
Output
(OSC1 = Input; OSC2 = Output)
18
R[0]
Output
Liquid crystal display (LCD) backplane drivers
19
R[1]
Output
20
R[2]
Output
21
R[3]
Output
PIN DESCRIPTION
SA9109B
sames
5/18
PIN DESCRIPTION (continued)
Pin
Designation
Type
Description
23
S[0]
Output
Liquid crystal display (LCD) segment drivers
24
S[1]
Output
25
S[2]
Output
26
S[3]
Output
27
S[4]
Output
28
S[5]
Output
29
S[6]
Output
30
S[7]
Output
31
S[8]
Output
32
S[9]
Output
33
S[10]
Output
34
S[11]
Output
35
S[12]
Output
36
S[13]
Output
22
COFF
Output
Connection for all unused LCD segments, to ensure
off status
7
CON
Analog
Connections for outer loop capacitor of A/D
6
COP
Analog
converter (Current)
5
CIN
Analog
Connections for inner loop capacitor of A/D
4
CIP
Analog
converter (Current)
16
CPIP
Analog
Connections for inner loop capacitor of A/D
15
CPIN
Analog
converter (Voltage)
14
CPOP
Analog
Connections for outer loop capacitor of A/D
13
CPON
Analog
converter (Voltage)
12
VREF
Analog
Connection for reference current setting resistor
39
SDO
Open drain Pulse rate output. Serial data output when PB is low
44
SR[0]
Input
Control for tariff register selection (on-chip pull-up)
1
SR[1]
Input
Control for tariff register selection (on-chip pull-up)
43
PB
Input
Push Button: Display select/start serial data
transmission on SDO (on-chip pull-up)
42
PGM
Input
Programming Mode. It is recommended that pin PGM be
connected to V
DD
via a 470
resistor to guard against
transients or noise
41
PDTA
Input
Programming Data (on-chip pull-down)
40
PCLK
Input
Programming Clock
SA9109B
6/18
sames
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.
Power Calculation
In the Application Circuit (Figure 1), the voltage drop across the shunt will be
between 0 and 16mV
RMS
(0 to 80A through a shunt resistor of 200
). This voltage
is converted to a current of between 0 and 16A
RMS
, by means of resistors R
1
and
R
2
.
The current sense input saturates at an input current of 25A peak.
The voltage level from the mains is divided down through a divider to 14V.This
voltage is converted to a signal current of 14A
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.
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 A
I
and A
V
generate virtual
shorts on the signal inputs. Exact duplications of the input currents are generated
for the analog signal processing circuitry.
SA9109B
sames
7/18
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:
G N D
DD
V
V O LTA G E
S E N S O R
IN P U T
DR-01254
IV N
SS
V
IIP
C U R R E N T
S E N S O R
IN P U TS
IIN
SS
V
DD
SS
V
V
VDD
A
V
A
I
SA9109B
8/18
sames
LCD Segment Address Table
Digit
Column
R[0]
R[1]
R[2]
R[3]
10
-1
S[0]
Total
c
b
a
LSD
S[1]
d
e
g
f
10
0
S[2]
T4
c
b
a
S[3]
d
e
g
f
10
1
S[4]
T3
c
b
a
S[5]
d
e
g
f
10
2
S[6]
T2
c
b
a
S[7]
d
e
g
f
10
3
S[8]
T1
c
b
a
S[9]
d
e
g
f
10
4
S[10]
Dir
c
b
a
S[11]
d
e
g
f
10
5
S[12]
h
c
b
a
MSD
S[13]
d
e
g
f
LCD Layout
The LCD display is given in the diagram below:
d
S[12]
S[13]
DR-01255
T4
S[3]
C OLU M N S
h
b
.
.
f
g
e
c
4
.
6
R [0]
BA
CKP
L
A
NE
S
S[0]
TOTAL
S[2]
S[1]
.
.
.
7
R [1]
R [2]
R [3]
SA9109B
sames
9/18
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:
10
5
10
4
10
3
10
2
10
1
10
0
10
-1
kWh
4.
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 (K
S
) into
the device during calibration. The output frequency at SDO (f
P
) is calculated by
means of the following formula:
f
P
=
11.16
*
FOSC
*
I
I
.I
V
*
40062.5
3.5795MHz I
R
2
K
S
Where
FOSC
= Oscillator frequency (2MHz ...... 4MHz)
I
I
= Input current for current sensor input (16A at rated line current)
I
V
= Input current for voltage sensor input (14A at rated line voltage)
I
R
= Reference current (typically 50A)
K
S
= 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
* At rated conditions
The display is incremented after every 64th pulse on SDO.
40062.5*
P ulses / s
D R -0 1 2 5 6
1 / K
s
D isplay
Incr em ent
1 / 64
f
p
SA9109B
10/18
sames
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.
K
O
= I
M
*
E
RR
I
R
* 6 * 10
-6
Where
I
M
= Measured current on the current sensor
I
R
= Rated current on the current sensor
E
RR
= Error ratio between the device and the Wh standard
K
O
= Offset constant (-127 ...127)
(The default value is 0)
Note that K
O
must be programmed as a integer value.
Display resolution
From the above formula for f
P
it can be derived that the slope constant, Ks, is given
by the following expression:
K
S
=
626 * 3600 * 1000 * E
kWL
V
L
* I
L
Where
E
kWh
= energy for 1 display increment in kWh
V
L
= rated line voltage
I
L
= rated line current
This formula is valid only if 16A
RMS
flows into the current sense input for rated line
current (I
L
) and 14A
RMS
flows into the voltage sense input for rated line voltage (V
L
).
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.
SA9109B
sames
11/18
Word
Bit
Function
Description
number number
1
31..28
Sign of Register 1
A '0' indicates a negative register value
1
27..0
Register 1
Contents of register 1 in binary coded decimal
2
31..28
Sign of Register 2
A '0' indicates a negative register value
2
27..0
Register 2
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
A '0' indicates a negative register value
'Total'
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
16 bits are available for the manufacturer of the
Identification
metering system as a system identification
7
31..28
ROM
Don't care
7
27..0
System
28 bits are available for the manufacturer of the
Identification
metering system as a system identification
8
31..0
ROM
Don't care
9
31
Programmed
Programmed slope select bit must be set if the
slope select
default slope in ROM is not used
9
30..26
ROM
Don't care
9
25
Summation
0 to select addition which takes direction of
method select
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 indi-
cated
9
20..14
Offset
Offset of the device in binary
9
13..0
Slope
Slope of the device in binary. (default = 11389)
10
31..0
ROM
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.
SA9109B
12/18
sames
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.
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:
t
min
= 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.
PDTA
BIT-N0
W ORD-NO
DR-01257
29
1
31
30
1
1
1
28
27
1
PCLK
PGM
10
24
1
1
1
26
25
0
23
1
SA9109B
sames
13/18
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]
SR[0]
Register
0
0
Register 1
0
1
Register 2
1
0
Register 3
1
1
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
Description
/
Start transmission
XXX
ID
3
Baud rate identification
YYYYYYYY
ID
<cr><lf><cr><lf>
Data header
0(nnnnnnnn)
Data of Reg. 1 (sign, 10e
5
, 10e
4
...10e
0
, 10e
-1
)
1(nnnnnnnn)
Data of Reg. 2
2(nnnnnnnn)
Data of Reg. 3
3(nnnnnnnn)
Data of Reg. 4
4(nnnnnnnn)
Data of Reg. 'Total' = Sum of registers 0 to 3
!<cr><lf><cr><lf>
End transmission
SA9109B
14/18
sames
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.
9.
Power Consumption
The power consumption rating of the SA9109B integrated circuit is less than 40mW.
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:
C
1
and C
2
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%.
C
3
and C
4
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.
R
1
, R
2
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
RMS
into the SA9109A, at
maximum line current.
R
1
= R
2
=
I
L
*
R
SH
16A
RMS
2
Where
I
L
=
Line current
RSH
=
Shunt resistor
SA9109B
sames
15/18
R
3
, R
6
and R
4
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
RMS
.
R
7
defines all on-chip bias and reference currents. With R
7
= 24k
, optimum conditions
are set. R
7
may be varied within 10% for calibration purposes. Any change to R
7
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.
4
B A T
D 1
D 2
IC - I
SA 9109B
2 0
C 4
R 3
C 5
R 4
R SH
SU PPL Y
0 V
D R - 0 1 2 5 8
1 9
1 8
1 7
R 2
R 1
R 6
9
1 0
C 1
C 3
1 4
1 3
1 2
1 1
1 6
1 5
7
8
6
5
C 2
- 2 .5 V
L O A D
R 1 1
R 1 0
+ 2 .5 V
C 1 0
0 V
R 7
C 7
C 9
C 6
PG M
.
.
N E G A T IV E T 1 T 2 T 3 T 4 T O T A L
.
.
.
.
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 9
3 7
3 6
3 5
3 4
3 3
3 2
3 0
3 1
3
2
4 1
4 2
1
4 4 4 3
4 0
3 8
3 9
XT A L
.
.
.
.
.
.
.
.
R 9
PD T A
PC L K
T A R IF F SE L EC T
D IS PL A Y
SE LEC T
- 2 .5 V
R 8
R 1 2
SA9109B
16/18
sames
Parts List for Application Circuit: Figure 1
Item
Symbol
Description
Detail
1
IC-1
SA9109B
PLCC-44
2
XTAL
Crystal 3.5795 MHz
Colour burst TV
3
R1
Resistor, 1% metal
Note 1
4
R2
Resistor, 1% metal
Note 1
5
R3
Resistor, 390k, 1%, metal
Note 2
6
R4
Resistor, 1M, 1%, metal
Note 2
7
R6
Resistor, 24k, 1%, metal
Note 2
8
R7
Resistor, 24k, 1% metal
9
R8
Resistor, 2M, 1%, metal
10
R9
Resistor, 820
, 1%, metal
11
R10
Resistor, 830
, 1%, metal
12
R11
Resistor, 820
, 1%, metal
13
R12
Resistor, 470
14
RSH
Shunt resistor
Note 3
15
C1
Capacitor, 560pF
16
C2
Capacitor, 560pF
17
C3
Capacitor, 3.3nF
18
C4
Capacitor, 3.3nF
19
C5
Capacitor, 1F
20
C6
Capacitor, 100nF
21
C7
Capacitor, 820nF
Note 4
22
C9
Capacitor, 100nF
23
C10
Capacitor, 100nF
24
BAT
Battery (1.2V)
25
LED
Light emitting diode
26
D1
Diode, Shottkey
27
D2
Diode, 1N4148
28
PB
Push button
29
DIPSW
DIP switch, 2 poles
Note 1:
Resistor (R1 and R2) values are dependant upon the selected value of RSH.
Note 2:
Resistor (R3, R4 and R6) values are dependant upon the rated mains voltage
(230V in this case).
Note 3:
See TYPICAL APPLICATIONS when selecting the value of RSH.
Note 4:
Capacitor (C7) to be positioned as close as possible to V
DD
& V
SS
of IC-1.
SA9109B
sames
17/18
ORDERING INFORMATION
Part Number
Package
SA9109BFA
PLCC-44
SA9109B
18/18
sames
Disclaimer:
The information contained in this document is confidential and proprietary to South African Micro-
Electronic 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 our web site:
http://www.sames.co.za
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:
012 333-6021
Tel:
Int +27 12 333-6021
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012 333-8071
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