SA9604A
4. Power Consumption
ThepowerconsumptionratingoftheSA9604Aintegratedcircuitislessthan50mW.
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
serialdatainputandoutputpinsfortheSA9604A,respectively.TheCEinputisused
to initiate and terminate a data transfer. The SCK pin is used to synchronize data
movementbetweenthemaster(micro-controller)andtheslave(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
Therearefourregistersforeachphasewhichcanberead: 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 (6HEX) must precede the 6 bit
address of the register being accessed.
The various register addresses are shown in the table below:
ID
1
REGISTER
Active:
A5
X
X
X
X
X
X
X
X
X
X
X
X
A4
X
X
X
X
X
X
X
X
X
X
X
X
A3
0
0
0
0
0
0
0
0
1
1
1
1
A2
0
0
0
0
1
1
1
1
0
0
0
0
A1
0
0
1
1
0
0
1
1
0
0
1
1
A0
0
1
0
1
0
1
0
1
0
1
0
1
Phase 1
Phase 1
Phase 1
2
Reactive:
Voltage:
Frequency: Phase 1
3
4
5
Active:
Phase 2
Phase 2
Phase 2
6
Reactive:
Voltage:
7
8
9
Frequency: Phase 2
Active:
Phase 3
Phase 3
Phase 3
10
11
12
Reactive:
Voltage:
Frequency: Phase 3
6/20
sa m e s
SAMES [ SAMES ]
