MAX7032 Maxim Integrated Products, MAX7032 Datasheet - Page 20

• Manufacturer Part Number: MAX7032
• Description: ASK/FSK Transceiver
• Manufacturer: Maxim Integrated Products

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Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
DIO is selected as an output of the MAX7032 for the fol-
lowing CS cycle whenever a READ command is
received. The CPU must tri-state the DIO line on the
cycle of CS that follows a read command, so the
MAX7032 can drive the data output line. Figure 9
shows the diagram of the 3-wire interface. Note that the
user can choose to send either 16 cycles of SLCK or
just eight cycles as all the registers are 8-bits wide. The
Figure 8. Data Input Diagram
Figure 9. Read Command on a 3-Wire Serial Interface
20
SCLK
SCLK
SCLK
DIO
DIO
DIO
CS
CS
______________________________________________________________________________________
CS
1
1
COMMAND
COMMAND
0
0
READ
READ
A5
A5
COMMAND
A4
A4
C1
A3
A3
C0
ADDRESS
ADDRESS
A2
A2
A5
A1
A1
A0
A0
A4
0
0
ADDRESS
A3
0
0
A2
0
0
0
DATA
0
DATA
A1
0
0
A0
0
0
user must drive DIO low at the end of the read
sequence.
The MASTER RESET command (0x3) (see Table 2)
sends a reset signal to all the internal registers of the
MAX7032 just like a power-off and power-on sequence
would do. The reset signal remains active for as long as
CS is high after the command is sent.
D7
0
0
0
0
D6
R7
R7
D5
R6
R6
D4
DATA
R5
R5
REGISTER DATA
8 BITS OF DATA
REGISTER DATA
D3
R4
R4
R3
16 BITS OF DATA
R3
D2
R2
R2
D1
R1
R1
D0
A3
R0
R7
REGISTER
DATA
R0