SA9122E
SINGLE PHASE UNIDIRECTIONAL POWER/ENERGY
METERING IC WITH SEPERATE 64 SEGMENT LCD DRIVER
FEATURES
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sames
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 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 µ-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.
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
1/12
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-
INTEG-
RATOR
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
2/12
sames
SA9122E
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage
V
DD
-V
SS
Current on any pin
I
PIN
Storage Temperature
T
STG
Operating Temperature
T
O
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
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10°C to +70°C
#
, unless otherwise
specified.)
Parameter
Supply Voltage: Positive
Supply Voltage: Negative
Supply Current: Positive
Supply Current: Negative
Symbol Min
V
DD
V
SS
I
DD
I
SS
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
I
II
-25
+25
µA
Peak value
Voltage Sensor Input (Asymmetrical)
Input Current Range
Pins FOUT1, FOUT2
Output Low Voltage
Output High Voltage
Pulse Rate FOUT1
FOUT2
1
I
IV
V
OL
V
OH
f
P
f
P2
-25
+25
V
SS
+1
V
DD
-1
10
0.5
f
P
/290
3/12
µA
V
V
Hz
Hz
Peak value
I
OL
= 5mA
I
OH
= -2mA
Specified linearity
Min and max limits
1160
3000
sames
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
-I
R
V
R
V
B
V
s
45
1.1
50
V
DD
&
V
SS
1/3 V
DD
2/3 V
DD
55
1.3
µA
V
With R = 24kΩ
connected to V
SS
Referred to V
SS
R[0] ... R[3]
S[0] ... S[15]
V
V
LCD segment Voltage
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
11
18
3
8
10
9
42
41
14
15
16
17
4
5
6
7
13
2
44
43
4/12
DIP-40 Designation
10
GND
16
V
DD
2
V
SS
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
sames
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
5/12
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