PM9110BF Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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PM9110BF

MONOCHIP THREE PHASE BIDIRECTIONAL KILOWATT HOUR METERING MODULE

South African Micro Electronic Systems 

PM9110BF

FUNCTIONAL DESCRIPTION

1. Energy Calculation

This Application Note should be read in conjunction with the SA9110A Data Sheet.

In the Application Circuit (see Figure 2), the output current from the current sensors

will be between 0 and 16µARMS. The current input stage of the module saturates at

input

used

tcourpreernfotsrmgrethaeteerntehragny1c8aµlAcuRMlaSt.ioTnh, etomgeatihnesrvwoiltthagthee(Vcuorltraegnet

+ 15% - 20%) is

information from

the current sensor (current transformers).

The SA9110AFA integrated circuit may be adjusted to accomodate any voltage or

current values. The method for calculating external component values is described

in section 9 (Circuit Description).

The accumulated energy is directly displayed on a 7 digit LCD. This unique

application offers a host of additional features, which are dealt with below.

2. Electrostatic Discharge (ESD) Protection

The device's inputs/outputs are protected against ESD. The modules resistance to

transients will be dependant upon the protection components used.

3. Power Consumption

The overall power consumption rating for this power metering application (Figure

2), is under 100mW, excluding the current sensors.

4. Isolation

The programming interface and pulse output are isolated from the module which

is at mains potential, via opto-couplers.

5. Isolated Programming Interface

This isolated interface is provided to allow the user to programme the tariff register

values, calibration constants and manufacturer/meter identification codes. This

port is enabled by inserting the jumpers J8, J9 and J10. The programming may be

performed via the parallel port of a personal computer.

The designation of the pins on connector SK1 are given below:

4/14

sames

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