Datasheet

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 format

shown in Figure 3 must be followed, allowing all the reg-

isters to be programmed within one CS cycle.

Using a byte descriptive notation, the write command

can be viewed as the following sequence:

SDI: <0x01> <Initial Address> <Data 0> <Data 1> … <Data N>

Data 0 is then written to the register addressed by

<Initial Address>, Data 1 is written to <Initial Address +

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).

Figure 3. SPI Write Command Format

Figure 2. SPI Format

SDI

SCLK

WRITE COMMAND (0x01) INITIAL ADDRESS (A[7:0]) DATA 0 DATA N

D7 D7D6 D5 D4 D3 D2 D1 D0A7 A6 A5 A4 A3 A2 A1 A0 D0

SDI

DATA 1 DATA N

SCLK

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

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MAX7057 300MHz to 450MHz Frequency-Programmable

ASK/FSK Transmitter