sames
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SA9122E
FEATURES
n
Performs unidirectional power and
energy measurement
n
On-chip 64 segment LCD driver
n
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
n
Total power consumption rating below
25 mW
n
Adaptable to different types of current
sensors
n
Operates over a wide temperature
range
n
Different pulse rate options available
for power information
n
LCD data input via a serial interface
SINGLE PHASE UNIDIRECTIONAL POWER/ENERGY
METERING IC WITH SEPERATE 64 SEGMENT LCD DRIVER
4362
PDS039-SA9122E-001
REV. A
19-09-1995
PIN CONNECTIONS
DESCRIPTION
The SAMES SA9122E Single Phase
unidirectional active Power/Energy metering
integrated circuit includes a seperate on-
chip 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 consump-
tion 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 applica-
tions 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.
DR-00932
11
VREF
V
R[3]
R[2]
R[1]
R[0]
DD
CPOP
CPON
CPIP
CPIN
16
17
18
19
20
12
13
14
15
1
RX
CON
IVN
IIP
G N D
IIN
SS
V
COP
CIN
CIP
6
7
8
9
10
3
5
4
2
30
S[9]
25
21
22
23
24
S[0]
S[1]
S[2]
S[3]
S[4]
29
28
27
26
S[5]
S[6]
S[7]
S[8]
40
FOUT2
35
S[14]
34
31
32
33
S[10]
S[11]
S[12]
S[13]
36
37
38
39
S[15]
OSC1
FOUT1
OSC2
Package: DIP-40
SA9122E
2/12
sames
Package: PLCC-44
N.C.
N.C.
12
34
VS S
3
D R - 0 0 9 3 4
CIP
CIN
C O P
IVN
CON
7
5
4
6
IIP
IIN
GND
9
8
10
11
O S C 2
F O U T 1
F O U T 2
N.C.
R X
O S C 1
S[15]
S[10
]
S[14
]
S[11
]
S[12
]
S[13
]
38
41
42
43
44
1
2
40
39
37
36
35
R[2]
21
CPIN
16
VREF
CPON
CPOP
13
14
15
CPIP
18
19
20
17
R[1]
VD D
R[0]
S[6]
30
S[7]
S[8]
S[9]
33
32
31
27
26
25
24
23
22
S[5]
28
29
S[3]
R[3]
N.C.
S[2]
S[0]
S[1]
S[4]
BLOCK DIAGRAM
POWER
INTEG-
RATOR
OSC
VOLTAGE
REF.
IVP
ANALOG
SIGNAL
PROCE-
SSING
GND
DR-00933
VREF
OSC1
IIP
IIN
OSC2
RX
SERIAL
INTERFACE
BACKPLANE
DRIVERS
R[3]
R[0]
POWER
TO
FREQUENCY
SRAM
VDD
SEGMENT
DRIVERS
S[15]
S[0]
FOUT1
FOUT2
VSS
SA9122E
sames
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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 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
(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
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
5
7
mA
Supply Current: Negative
I
SS
5
7
mA
Current Sensor Inputs (Differential)
Input Current Range
I
II
-25
+25
A
Peak value
Voltage Sensor Input (Asymmetrical)
Input Current Range
I
IV
-25
+25
A
Peak value
Pins FOUT1, FOUT2
Output Low Voltage
V
OL
V
SS
+1
V
I
OL
= 5mA
Output High Voltage
V
OH
V
DD
-1
V
I
OH
= -2mA
Pulse Rate FOUT1
f
P
10
1160
Hz
Specified linearity
0.5
3000
Hz
Min and max limits
FOUT2
1
f
P2
f
P
/290
SA9122E
4/12
sames
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
Symbol
Min
Typ
Max
Unit
Condition
Oscillator
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
Pin VREF
With R = 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
LCD backplane Voltage
V
B
V
DD
&
V
SS
V
R[0] ... R[3]
LCD segment Voltage
V
s
1/3 V
DD
V
2/3 V
DD
S[0] ... S[15]
Note1:
Two additional bondout options at FOUT2 are available on request: f
p
/4 and
f
p
/16.
#
Extended Operating Temperature Range available on request.
PIN DESCRIPTION
PLCC-44
DIP-40
Designation
Description
11
10
GND
Ground
18
16
V
DD
Positive Supply Voltage
3
2
V
SS
Negative Supply Voltage
8
7
IVN
Analog input for Voltage
10
9
IIN
Inputs for current sensor
9
8
IIP
42
38
OSC1
Connections for crystal or ceramic resonator
41
37
OSC2
(OSC1 = Input ; OSC2 = Output)
14
12
CPON
Connections for outer loop capacitor of
15
13
CPOP
A/D converter (Voltage)
16
14
CPIN
Connections for inner loop capacitor of
17
15
CPIP
A/D converter (Voltage)
4
3
CIP
Connections for inner loop capacitor of
5
4
CIN
A/D converter (Current)
6
5
COP
Connections for outer loop capacitor of
7
6
CON
A/D converter (Current)
13
11
VREF
Connection for current setting resistor
2
1
RX
Serial data input
44
40
FOUT2
Pulse rate outputs
43
39
FOUT1
SA9122E
sames
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PLCC-44
DIP-40 Designation
Description
19
17
R[0]
Output drivers for LCD back planes
20
18
R[1]
21
19
R[2]
22
20
R[3]
24
21
S[0]
Output drivers for LCD segments
25
22
S[1]
26
23
S[2]
27
24
S[3]
28
25
S[4]
29
26
S[5]
30
27
S[6]
31
28
S[7]
32
29
S[8]
33
30
S[9]
35
31
S[10]
36
32
S[11]
37
33
S[12]
38
34
S[13]
39
35
S[14]
40
36
S[15]
1
NC
Not connected
12
NC
23
NC
34
NC
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.
PIN DESCRIPTION (Continued)
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