FEATURES
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Bi-directional active and reactive power/energy
measurement
RMS Voltage and frequency measurement
Individual Phase information
SPI communication bus
Meets the IEC 61036 Specification requirements for Class 1
AC Watt hour meters
sames
Three Phase Power / Energy IC with SPI
Interface
SA9904B
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Meets the IEC 61268 Specification requirements for
Class 2 VAR hour meters
Protected against ESD
Total power consumption rating below 60mW
Uses current transformers for current sensing
Operates over a wide temperature range
Precision on-chip voltage reference
DESCRIPTION
The SAMES SA9904B is a three phase bi-directional
energy/power metering integrated circuit that
Measured values for active and reactive energy, the mains
voltage and frequency for each phase are accessible through
the SPI interface from 24 bit registers. The SA9904B active and
reactive energy registers are capable of holding at least 52
seconds of accumulated energy at full load. A
has been
designed to measure active and reactive energy, RMS mains
voltage and frequency. The SA9904B has an integrated SPI
serial interface for communication with a micro-controller.
mains voltage
zero crossover is available on the F50 output.
The SA9904B includes all the required functions for three-
phase power and energy measurement such as oversampling
A/D converters for the voltage and current sense inputs, power
calculation and energy integration. This innovative universal
three phase power/energy metering integrated circuit is ideally
suited for energy calculations in applications such as electricity
dispensing systems, residential metering and factory energy
metering and control.
The SA9904B integrated circuit is available in 20 pin dual-in-
line plastic (PDIP20), as well as 20 pin small outline (SOIC20)
package types.
Figure 1: Block diagram
SPEC-0447 (REV. 5)
05-02-03
IVP1
SPI
VOLTAGE
REF.
DI
VSS
VDD
DO
F50
VREF OSC2OSC1
GND
ACTIVE
REACTIVE
RMS
VOLTAGE
MAINS
FREQ.
CURRENT
ADC
VOLTAGE
ADC
SCK
CS
OSC
IIP1
IIP2
IVP2
IVP3
IIN2
IIN2
IIN3
IIP3
DR-01641
