Pin Selectable Three Phase Power / Energy Metering
IC for Stepper Motor / Impulse Counter Applications
with Anti Tamper Features
SA2005M
FEATURES
+
Direct drive for
+
+
+
electro-mechanical counters or stepper
sames
+
+
+
+
+
motors
Selectable dividing ratios for different meter rated
conditions
Per phase energy direction and voltage fail indication
Precision oscillator on chip
Meets the IEC 521/1036 Specification requirements for
Class 1 AC Watt hour meters
Operates over a wide temperature range
Easily adaptable to different signal levels
Precision voltage reference on chip
Protected against ESD
DESCRIPTION
The SAMES SA2005M provides a single chip active energy
metering solution for three phase mechanical counter-based
meter designs. Very few external components are required
and it has direct drive capability for electro-mechanical
counters.
The SAMES SA2005M is a CMOS mixed signal integrated
circuit that performs three phase power/energy calculations
over a range of 1000:1, to an overall accuracy of better than
Class 1.
The integrated circuit includes all the required functions for 3-
phase power and energy measurement such as 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.
VDD VSS
The SA2005M drives a calibration LED directly.
voltage fail and voltage sequence faults as well
direction indication are available as LED outputs.
divider ratios enable various mechanical counter
motor counter resolutions.
Per phase
as energy
Selectable
or stepper
A precision oscillator, that replaces an external crystal, is
integrated on chip. A voltage reference is integrated on chip.
The SA2005M integrated circuit is available in 24-pin dual in
line plastic (DIP-24) and small outline (SOIC-24) package
options.
IIN1
IIP1
IVN1
IIN2
IIP2
IVN2
IIN3
IIP3
IVN3
GND
I1
X
V1
I2
X
V2
I3
X
V3
PROGRAM-
MABLE
ADDER
POWER
TO
PULSE
RATE
LED
MON
MOP
PH1
PH2
PH3
PH / DIR
REF
TIMING & CONTROL
OSC
SELECTOR
INTERFACE
dr-01616
VREF
TEST
RA RE
IM
Figure 1: Block diagram
SPEC-0115 (REV. 3)
1/12
09-05-02
SAMES [ SAMES ]
