sames
FEATURES
s
SA9604A
THREE PHASE BIDIRECTIONAL POWER/ENERGY
METERING IC WITH SERIAL SPI INTERFACE
s
s
Performs bidirectional active and
reactive power/energy measurement
Voltage and frequency measurement
Individual
accessable
phase
information
Protected against ESD
Uses current transformers for current
sensing
Excellent long term stability
Operates over a wide temperature
range
Precision Voltage Reference on-chip
s
s
s
s
s
s
SPI communication bus
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
s
DESCRIPTION
PIN CONNECTIONS
The SAMES SA9604A Bidirectional Three
Phase Power/Energy metering integrated
circuit has a serial interface, ideal for use
with a µ-Controller. The SA9604A performs
1
20
IVP2
IIP 2
the calculation for active and reactive power
or energy, mains voltage sense and
IIN2
2
19
IIN1
frequency.
IVP3
3
18
IIP 1
The measurements performed and the
IIP 3
4
17
IVP1
resultant register values are provided for
individual phases.
5
16
G ND
IIN3
The integrated values for active and reactive
V DD
6
15
VREF
energy, as well as the mains voltage sense
and frequency information, are accessable
F1 50
7
14
V SS
through the SPI as 24 bit values.
8
13
CS
SCK
This innovative universal three phase power/
9
12
DI
D0
energy metering integrated circuit is ideally
suited for energy calculations in applications
O SC1
10
11
O SC2
such as primary industrial metering and
factory energy metering and control.
DR-01306
The SA9604A integrated circuit is available
in both 20 pin dual-in-line plastic (DIP-20),
Package: DIP-20
as well as 20 pin small outline (SOIC-20)
SOIC-20
package types.
1/20
SA9604A
PDS039-SA9604A-001
REV. 5
29-05-00
SA9604A
BLOCK DIAGRAM
V DD
V SS
II P1
II N1
II P2
II N2
II P3
II N3
ACTIVE
ENERGY
A N A LO G
S IG N A L
P ROCE S -
REACTIVE
ENERGY
VOLTAGE
FREQUENCY
SPI
DI
DO
SCK
CS
I VP1
I VP2
I VP3
G ND
S IN G
F 150
VOLTAGE
REF.
OS C
D R -01 3 0 7
VREF
O SC1 O SC2
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage
V
DD
-V
SS
Current on any pin
Storage Temperature
Operating Temperature
I
PIN
T
STG
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.
2/20
sames
SA9604A
ELECTRICAL CHARACTERISTICS
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10°C to +70°C
#
, unless otherwise
specified.)
Parameter
Symbol
Operating temp. range
T
O
Supply Voltage: Positive
V
DD
Supply Voltage: Negative
V
SS
Supply Current: Positive
I
DD
Supply Current: Negative
I
SS
Current Sensor Inputs (Differential)
Input Current Range
I
II
Voltage Sensor Input (Asymetrical)
Input Current Range
I
IV
Pin DO
Low Voltage
V
OL
High Voltage
V
OH
Pin DI
High Voltage
V
IH
Low Voltage
V
IL
Pin SCK
High Voltage
Low Voltage
V
IH
V
IL
f
SCK
t
LO
t
HI
Pin CS
High Voltage
Low Voltage
Pin F150
Low Voltage
High Voltage
Oscillator
Pin VREF
Ref. Current
Ref. Voltage
#
Min
-25
2.25
-2.75
Typ
Max
+85
2.75
-2.25
10
10
+25
+25
V
SS
+1
Unit
°C
V
V
mA
mA
µA
µA
V
V
V
V
V
V
kHz
µs
µs
V
V
V
V
Condition
8
8
-25
-25
Peak value
Peak value
I
OL
= 5mA
I
OH
= -2mA
V
DD
-1
V
DD
-1
V
SS
+1
V
DD
-1
V
SS
+1
800
0.6
0.6
V
DD
-1
V
SS
+1
V
SS
+1
V
DD
-1
V
IN
= V
SS
V
IN
= V
SS
V
IH
V
IL
V
OL
V
OH
V
IN
= V
SS
I
OL
= 5mA
I
OH
= -2mA
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
-I
R
V
R
22.5
1.1
25
27.5
1.3
µA
V
With R = 47kΩ
connected to V
SS
Reference to V
SS
3/20
Extended Operating Temperature Range available on request.
sames
SA9604A
PIN DESCRIPTION
Pin
16
6
14
17
20
3
19
18
2
1
5
4
10
11
9
12
8
13
7
15
Designation
GND
V
DD
V
SS
IVP1
IVP2
IVP3
IIN1
IIP1
IIN2
IIP2
IIN3
IIP3
OSC1
OSC2
DO
DI
SCK
CS
FM150
VREF
Connections for crystal or ceramic resonator
(OSC1 = Input; OSC2 = Output)
Serial Interface Out
Serial Interface In
Serial Clock In
Chip Select (Active High)
Voltage Sense Zero Crossover
Connection for current setting resistor
Input for Current sensor: Phase 3
Input for Current sensor: Phase 2
Description
Ground
Positive Supply Voltage
Negative Supply Voltage
Analog input for Voltage: Phase 1
Analog input for Voltage: Phase 2
Analog input for Voltage: Phase 3
Inputs for Current sensor:Phase 1
FUNCTIONAL DESCRIPTION
The SA9604A is a CMOS mixed signal Analog/Digital Integrated Circuit, which performs
the measurement of active power, reactive power, voltage and frequency.
Internal offsets are eliminated through the use of cancellation procedures. The SA9604A
integrates the measured active and reactive power consumption and the average mains
voltage into 24 bit integrators, which are accessable via the SPI bus. The mains
frequency information is also available as a 24 bit register value.
The zero crossover of each voltage sense input is signalled on the FM150 (pin 7) output.
This output of 150Hz will allow monitoring by a microcontroller to synchronise with internal
timing for data aquisition. Refer to 5.5 for further information.
The SA9604A has tristate output to allow connection of more than one metering device
on a single SPI bus.
4/20
sames
SA9604A
1.
Power calulation
In the Application Circuit (Figure 1), the voltages from Line 1, Line 2 and Line 3, are
converted to currents and applied to the voltage sense inputs IVN1, IVN2 and IVN3.
The current levels on the voltage sense inputs are derived from the mains voltage
(3 x 230 V
AC
) being divided down through voltage dividers to 14V
RMS
. The resulting
input currents into the A/D converters are 14µA
RMS
through the resistors R
15
, R
16
and
R
17
.
For the current sense inputs, the voltages across the current transformers terminating
resistors are converted to currents of 16µA
RMS
for rated conditions, by means of
resistors R
8
, R
9
(Phase 1); R
10
, R
11
(Phase 2); and R
12
, R
13
(Phase 3).
The signals providing the current information are applied to the current sensor
inputs: IIN1; IIP1; IIN2; IIP2; IIN3; and IIP3.
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 copies of the input currents are generated for the
following analog signal processing circuitry.
V DD
II P
CURRENT
SE NS OR
INPUT S
V SS
A
V DD
I
II N
V SS
VDD
IV P
VOL T AGE
SE NS OR
INPUT
V SS
A
V
DR-0 1 3 0 8
GND
3.
Electrostatic Discharge (ESD), Protection
The SA9604A Integrated Circuits inputs/outputs are protected against ESD.
sames
5/20
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
