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PDF SA9903 Data sheet ( Hoja de datos )

Número de pieza SA9903
Descripción Single Phase Power / Energy IC with SPI Interface
Fabricantes Sames 
Logotipo Sames Logotipo



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No Preview Available ! SA9903 Hoja de datos, Descripción, Manual

Single Phase Power / Energy IC
with SPI Interface
SA9903B
sames
+ FEATURES
+ Bi-directional active and reactive power/energy
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.
+ 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
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
IIP
IIN
IVP
GND
CURRENT
ADC
VOLTAGE
ADC
VOLTAGE
REF.
ACTIVE
REACTIVE
RMS
VOLTAGE
MAINS.
FREQ.
OSC
Dr-01583
VREF
OSC1 OSC2
Figure 1: Block diagram
SPI
SPEC-0051 (REV. 2)
1/12
DI
DO
SCK
CS
FMO
26-02-01

1 page




SA9903 pdf
SA9903B
OUTPUT SIGNALS
SERIAL DATA OUT (DO)
The DO pin is the serial data output pin for the SA9903B. The
Serial Clock (SCK) determines the data output rate. Data is
only transferred during on active chip select (CS). This output
is tri-state when CS is low.
MAINS VOLTAGE SENSE ZERO CROSSOVER
(FMO)
The FMO output generates a signal, which follows the mains
voltage zero crossings, see figure 4. The micro controller may
use the FMO to extract mains timing.
ELECTROSTATIC DISCHARGE (ESD) PROTECTION
The SA9903B Integrated Circuit's inputs/outputs are protected
against ESD.
POWER CONSUMPTION
The power consumption rating of the SA9903B integrated
circuit is less than 25mW.
sames
SPI - INTERFACE
DESCRIPTION
A serial peripheral interface bus (SPI) is a synchronous bus
used for data transfers between a micro controller and the
SA9903B. The pins DO (Serial Data Out), DI (Serial Data In),
CS (Chip Select), and SCK (Serial Clock) are used in the bus
implementation. The SA9903B is the slave device with the
micro controller the bus master. The CS input initiates and
terminates data transfers. A SCK signal (generated by the
micro controller) strobes data between the micro-controller
and the SCK pin of the SA9903B device. The DI and DO pins
are the serial data input and output pins for the SA9903B,
respectively.
REGISTER ACCESS
The SA9903B contains four 24 bit registers. The content
represents active energy, reactive energy, mains voltage and
mains frequency. The register addresses are shown in the
following table:
ID Register
1 Active
2 Reactive
3 Voltage
4 Frequency
Header
bits A5 A4 A3 A2 A1 A0
110XX0 000
110XX0 001
110XX0 010
110XX0 011
Voltage
FM0
Dr-01498
http://www.sames.co.za
Figure 4: Mains voltage zero corssover pin FMO
5/12
+5V (VDD)
0V (VSS)

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SA9903B
sames
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