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SA9103ESA

SINGLE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH SERIAL INTERFACE

South African Micro Electronic Systems 

SA9103E

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 200µΩ). This voltage is

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

1

2

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

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

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

at nominal mains voltage,via resistor R4 (1MΩ).

In this configuration, with a mains voltage of 230V and a current of 80A, the SA9103E

functions at its optimum conditions, having a margin of 3dB for overload available.

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.

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

I

V

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

for the analog signal processing circuitry.

V DD

IIP

CURRENT

V SS

SENSOR

INPUTS

VDD

IIN

V SS

VDD

IVP

VOLTAGE

SENSOR

V SS

INPUT

AI

AV

DR-00919

GND

sames

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