SA9604A

sames

6/20

4.

Power Consumption

The power consumption rating of the SA9604A integrated circuit is less than 50mW.

5.

SPI - INTERFACE

5.1 Description

The serial peripheral interface (SPI) is a synchronous bus for data transfer and is

used when interfacing the SA9604A with any micro-controller. Four pins are used

for the SPI. The four pins are DO (Serial Data Out), DI (Serial Data In), CE (Chip

Enable), and SCK (Serial Clock). The SA9604A is the slave device in an SPI

application, with the micro-controller being the master. The DI and DO pins are the

serial data input and output pins for the SA9604A, respectively. The CE input is used

to initiate and terminate a data transfer. The SCK pin is used to synchronize data

movement between the master (micro-controller) and the slave (SA9604A) devices.

The serial clock (SCK), which is generated by the micro-controller, is active only

during address and data transfer to any device on the SPI bus.

5.2 Register Access

There are four registers for each phase which can be read: active, reactive, voltage

and frequency. Any of these registers may be chosen as the initial register to read.

If the SCK clock input continues after the first register has been read, the contents

of subsequent registers will be output on the DO pin. Transfer will continue until CS

is brough inactive.

To enable registers for reading, the sequence 1 1 0 (6

address of the register being accessed.

The various register addresses are shown in the table below:

ID

REGISTER

A5

A4

A3

A2

A1

A0

1

Active:

Phase 1

X

X

0

0

0

0

2

Reactive:

Phase 1

X

X

0

0

0

1

3

Voltage:

Phase 1

X

X

0

0

1

0

4

Frequency:

Phase 1

X

X

0

0

1

1

5

Active:

Phase 2

X

X

0

1

0

0

6

Reactive:

Phase 2

X

X

0

1

0

1

7

Voltage:

Phase 2

X

X

0

1

1

0

8

Frequency:

Phase 2

X

X

0

1

1

1

9

Active:

Phase 3

X

X

1

0

0

0

10

Reactive:

Phase 3

X

X

1

0

0

1

11

Voltage:

Phase 3

X

X

1

0

1

0

12

Frequency:

Phase 3

X

X

1

0

1

1