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SA9604A

THREE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH SERIAL SPI INTERFACE

South African Micro Electronic Systems 

SA9604A

PIN DESCRIPTION

Pin

Designation

16

GND

6

V

DD

14

VSS

17

IVP1

20

IVP2

3

IVP3

19

IIN1

18

IIP1

2

IIN2

1

IIP2

5

IIN3

4

IIP3

10

OSC1

11

OSC2

9

DO

12

DI

8

SCK

13

CS

7

FM150

15

VREF

Description

Ground

Positive Supply Voltage

Negative Supply Voltage

Analog input for Voltage: Phase 1

Analog input for Voltage: Phase 2

Analog input for Voltage: Phase 3

Inputs for Current sensor:Phase 1

Input for Current sensor: Phase 2

Input for Current sensor: Phase 3

Connections for crystal or ceramic resonator

(OSC1 = Input; OSC2 = Output)

Serial Interface Out

Serial Interface In

Serial Clock In

Chip Select (Active High)

Voltage Sense Zero Crossover

Connection for current setting resistor

FUNCTIONAL DESCRIPTION

The SA9604A is a CMOS mixed signal Analog/Digital Integrated Circuit, which performs

the measurement of active power, reactive power, voltage and frequency.

Internal offsets are eliminated through the use of cancellation procedures. The SA9604A

integrates the measured active and reactive power consumption and the average mains

voltage into 24 bit integrators, which are accessable via the SPI bus. The mains

frequency information is also available as a 24 bit register value.

The zero crossover of each voltage sense input is signalled on the FM150 (pin 7) output.

This output of 150Hz will allow monitoring by a microcontroller to synchronise with internal

timing for data aquisition. Refer to 5.5 for further information.

The SA9604A has tristate output to allow connection of more than one metering device

on a single SPI bus.

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