Single Phase Power / Energy IC
with SPI Interface
SA9903B
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FEATURES
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Bi-directional active
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and reactive power/energy
sames
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Meets the IEC 1268 Specification requirements for VAR
hour meters
Protected against ESD
Total power consumption rating below 25mW
Adaptable to different current sensor technologies
Operates over a wide temperature range
Precision voltage reference on-chip
measurement
RMS Voltage and frequency measurement
SPI communication bus
Meets the IEC 521/1036 Specification requirements for
Class 1 AC Watt hour meters
DESCRIPTION
The SAMES SA9903B is a single phase bi-directional
energy/power metering integrated circuit that performs
measurement of active and reactive power, mains voltage and
mains frequency.
The SA9903B is pin compatible to the SA9603B. New features
include, RMS mains voltage and accurate reactive power
measurements.
Measured values for active and reactive energy, the mains
voltage and frequency are accessible through a SPI bus from
24 bit registers.
This innovative universal single phase power/energy metering
integrated circuit is ideally suited for energy calculations in
applications such as electricity dispensing systems (ED's),
residential municipal metering and factory energy metering
and control.
TheSA9903B integrated circuit is available in both 20 pin dual-
in-line plastic (DIP-20), as well as 20 pin small outline (SOIC-
20) package types.
TEST
VDD
VSS
ACTIVE
IIP
IIN
CURRENT
ADC
REACTIVE
SPI
IVP
RMS
VOLTAGE
VOLTAGE
ADC
MAINS.
FREQ.
FMO
GND
VOLTAGE
REF.
OSC
DI
DO
SCK
CS
Dr-01583
VREF
OSC1
OSC2
Figure 1: Block diagram
SPEC-0051 (REV. 2)
1/12
26-02-01
SAMES [ SAMES ]
