MAX7057ASE+T【PDF 11/20 页】IC TRANSMITTER ASK/FSK 16-SOIC

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Depending on the command, byte 1 through byte N

may assume different functions. They may either be a

direct command (write, read, read all, reset), or an

address or data contents. The commands available in

the MAX7057 SPI are described in detail below:

Write: The write command (0x01) is used to program

the MAX7057 registers (see Tables 2 and 3). The for-

mat shown in Figure 3 must be followed, allowing all the

registers to be programmed within one CS cycle.

Using a byte descriptive notation, the write command

can be viewed as the following sequence:

Data 0 is then written to the register addressed by

<Initial Address>, Data 1 is written to

1>, and so on.

Read: To execute an SPI read operation, the general-

purpose output (GPO) pin must be configured to either

a CKOUT_SDO or SDO function (see Tables 15 and 16

for details).

SDI: <0x01> &

300MHz to 450MHz Frequency-Programmable

ASK/FSK Transmitter

______________________________________________________________________________________ 11

Figure 2. SPI Format

SDI

SCLK

WRITE COMMAND (0x01)

INITIAL ADDRESS (A[7:0])

DATA 0

DATA N

D6 D5 D4 D3 D2 D1 D0

A7 A6 A5 A4 A3 A2 A1 A0

SDI

DATA 1

DATA N

SCLK

D7 D6 D5 D4 D3 D2 D1 D0

Figure 3. SPI Write Command Format

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