SA9102.PDF

sames

SA9102C

SINGLE PHASE UNIDIRECTIONAL POWER/ENERGY

METERING IC PULSE OUTPUT

FEATURES

Performs unidirectional power and

energy measurement

Adaptable to different types of current

sensors

Meets the IEC 521/1036 Specification

requirements for Class 1 AC Watt hour

meters

Operates over a wide temperature

range

Protected against ESD

Precision voltage reference on-chip

Total power consumption rating typically

25mW

Different pulse rate options available

DESCRIPTION

The SAMES SA9102C Single Phase

unidirectional Power/Energy metering

integrated circuit generates a pulse rate

output, the frequency of which is

proportional to the power consumption.

The SA9102C performs the calculation for

active power.

This method of calculation takes the power

factor into account.

Energy consumption is determined by the

power measurement being integrated over

time.

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.

The SA9102C 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.

PIN CONNECTIONS

IIN

GND

IIP

IVP

VREF

CION

CVON

CIOP

CVOP

CIIN

CVIN

CVIP

V DD

OSC2

CIIP

V SS

FOUT2

FOUT1

OSC1

DR-00020

Package: DIP-20

SOIC-20

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2047

PDS039-SA9102C-001 REV. D

05-09-1995

SA9102C

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS*

Parameter

Symbol

Min

Max

Unit

Supply Voltage

V DD -V SS

-0.3

6.0

Current on any pin

I PIN

-200

+200

Storage Temperature

T STG

-40

+125

°C

Operating Temperature

T O

-40

+85

°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.

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SA9102C

ELECTRICAL CHARACTERISTICS

(V DD = 2.5V, V SS = -2.5V, over the temperature range -10°C to +70°C # , unless otherwise

specified.)

Parameter

Symbol Min Typ Max Unit Condition

Supply Voltage: Positive

V DD

2.25

2.75

Supply Voltage: Negative

V SS

-2.75

-2.25 V

Supply Current: Positive

I DD

Supply Current: Negative

I SS

Current Sensor Inputs (Differential)

Input Current Range

I II

-25

+25 µA Peak value

Voltage Sensor Input (Asymetrical)

Input Current Range

I IV

-25

+25 µA Peak value

Pins FOUT1, FOUT2

Output Low Voltage

V OL

V SS -1 V I OL = 5mA

Output High Voltage V OH

V DD -1

V I OH = -2mA

Pulse Rate FOUT1

f P

1160 Hz Specified linearity

0.5

1600 Hz Min and max limits

FOUT2 1

f P2

f P /290

Oscillator

Recommended crystal:

TV colour burst crystal f = 3.5795 MHz

Pin VREF

With R = 24k

Ref. Current

I R

µA connected to V SS

Ref. Voltage

V R

1.1

1.3

V Referred to V SS

Note 1: An option of FOUT2 = f p /4 is available on request.

# Extended Operating Temperature Range available on request.

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SA9102C

PIN DESCRIPTION

Designation

Description

GND

Ground

V DD

Positive Supply Voltage

V SS

Negative Supply Voltage

IVP

Analog input for Voltage

IIN

Inputs for current sensor

IIP

OSC1

Connections for crystal or ceramic resonator

OSC2

(OSC1 = Input : OSC2 = Output)

FOUT1

First pulse rate output

FOUT2

Second pulse rate output

CVON

Connections for outer loop capacitor of

CVOP

A/D converter (Voltage)

CVIN

Connections for inner loop capacitor of

CVIP

A/D converter (Voltage)

CIIP

Connections for inner loop capacitor of

CIIN

A/D converter (Current)

CIOP

Connections for outer loop capacitor of

CION

A/D converter (Current)

VREF

Connection for current setting resistor

Not connected

FUNCTIONAL DESCRIPTION

The SA9102C is a CMOS mixed signal Analog/Digital integrated circuit, which performs

power/energy calculations across a power range of 1000:1, to an overall accurancy of

better than Class 1.

The integrated circuit includes all the required functions for 1-phase power and energy

measurement, such as two 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. The SA9102C generates pulses, the

frequency of which is proportional to the power consumption. Two frequency outputs'

(FOUT1 and FOUT2) are available, with a third frequency option available on request.

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SA9102C

). This voltage is

converted to a current of between 0 and 16µA, by means of resistors R 1 and R 2 .

The current sense input saturates at an input current of ±25µA peak.

For the voltage sensor input, the mains voltage (230VAC) is divided down through

a divider to 14V. The current into the A/D converter input is set at 14µA for a nominal

mains voltage, via the resistor R4 (1M

In this configuration, with a mains voltage of 230V and a current of 80A, the output

frequency of the SA9102C power meter chip at FOUT1 (Pin 12) is 1.16kHz. In this

case 1 pulse will correspond to an energy consumption of 18.4kVA/1160Hz =

15.9Ws.

The output frequency at FOUT2 is FOUT1 /290 (i.e. The frequency ouput at pin 12

is divided by 290).

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, in conjunction with the amplifiers input configuration.

The feedback loops from the outputs of the amplifiers A I and A V generate virtual

shorts on the signal inputs. Exact duplications of the input currents are generated

for the analog signal processing circuitry.

IIP

CURRENT

SENSOR

INPUTS

A I

IIN

I VP

VOLTAGE

SENSOR

INPUT

A V

DR-00502

GND

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1. Power calculation

In the Application Circuit (Figure 1), the voltage drop across the shunt will be

between 0 and 16mV (0 to 80A through a shunt resistor of 200µ

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