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SA9103CSA

SINGLE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH SERIAL INTERFACE

South African Micro Electronic Systems 

SA9103C

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 R1 and R2.

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

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

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

nominal voltage, via resistor R4 (1MΩ).

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

SA9103C 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

AI

INPUTS

V DD

IIN

VSS

VDD

IVP

VOLTAGE

SENSOR

V SS

INPUT

AV

DR-00831

GND

sames

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