SA9604A

sames

4/20

PIN DESCRIPTION

Pin

Designation

Description

16

GND

Ground

6

V

DD

Positive Supply Voltage

14

V

SS

Negative Supply Voltage

17

IVP1

Analog input for Voltage: Phase 1

20

IVP2

Analog input for Voltage: Phase 2

3

IVP3

Analog input for Voltage: Phase 3

19

IIN1

Inputs for Current sensor:Phase 1

18

IIP1

2

IIN2

Input for Current sensor: Phase 2

1

IIP2

5

IIN3

Input for Current sensor: Phase 3

4

IIP3

10

OSC1

Connections for crystal or ceramic resonator

11

OSC2

(OSC1 = Input; OSC2 = Output)

9

DO

Serial Interface Out

12

DI

Serial Interface In

8

SCK

Serial Clock In

13

CS

Chip Select (Active High)

7

FM150

Voltage Sense Zero Crossover

15

VREF

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.