Rainbow-electronics MAX7473 Manual de usuario descargar pdf (Pagina 13)

Read Cycle

In read mode (R/W = 1), the MAX7472/MAX7473 write

the contents of the Status, Channel Selection, or

Frequency register to the bus. When the command

byte indicates a read operation of either the Status or

the Frequency register, the serial interface expects an

Sr condition to follow the command byte. After sending

an Sr, the master sends the MAX7472/MAX7473 slave

address byte followed by the R/W bit (set to 1 to indi-

cate a read). The slave device (MAX7472/MAX7473)

generates an ACK for the second address word and

immediately after the ACK clock pulse, the direction of

data flow reverses. The slave (MAX7472/MAX7473)

then transmits 1 byte of data containing the value of the

8 shows a basic read sequence.

Note: To read the contents of the Status, Channel

Selection, or Frequency register, the master must first

write a command byte, requesting to read the Status,

Channel Selection, or Frequency register.

MAX7472/MAX7473

HDTV Anti-Aliasing Filters with Triple-Input Mux

______________________________________________________________________________________ 13

SDA

SCL

1 0 0 1 0 A1 A0 R/W

C7 C6 C5 C4 C3 C2 C1 C0

ACK ACK

OUTIN INOUTIN TO MAX7472/MAX7473

COMMAND BITE IS FOR POWER-DOWN.

SDA

DIRECTION

START

00000000

STOP

Figure 7. Write Sequence for a Command Bite

R/W

SDA

SCL

1 0 0 1 0 A1 A0 R/W

C7 C6 C5 C4 C3 C2 C1 C0

ACK

OUTINOUTIN TO MAX7472/MAX7473

SDA (CONT)

SDA

DIRECTION

SDA

DIRECTION

SCL (CONT)

D71 D6 D5 D4 D3 D2 D1 ACK

OUT

D0000 1 A1 A0

IN IN

START

STOP

0 0 0 1 0 0 1/0 1

Figure 8. Basic Read Sequence

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 19

MAX7472/MAX7473 1

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Rainbow-electronics MAX7473 Manual de usuario Pagina 13

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