Rainbow-electronics MAX9135 Manual do Utilizador descarregar pdf (Página 11)

MAX9132/MAX9134/MAX9135

C Interface

The MAX9132/MAX9134/MAX9135 operate as slaves

that send and receive data through I

C (see Figure 1).

The interface uses a serial-data line (SDA) and a serial-

clock line (SCL) to achieve bidirectional communication

between master(s) and slave(s). A master (typically a

microcontroller) initiates all data transfers to and from

the slave and generates the SCL clock that synchro-

nizes the data transfer. The SDA line operates as both

an input and an open-drain output. A pullup resistor,

typically 4.7kΩ, is required on SDA. The SCL line oper-

ates only as an input. A pullup resistor is required on

SCL if there are multiple masters on the I

C interface, or

if the master in a single-master system has an open-

drain SCL output. Each transmission consists of a

START condition sent by a master, followed by the 7-bit

slave address plus R/W bit, a register address byte, a

data byte, and finally a STOP condition. Table 3 shows

the slave address selection by the AS0 and AS1 pins.

Data Format for Writing to the Slave

A write to the MAX9132/MAX9134/MAX9135 comprises

the transmission of the slave address with the R/W bit

set to 0, followed by at least 1 byte of information. The

first byte of information is the command byte. The com-

mand byte determines which registers of the

MAX9132/MAX9134/MAX9135 are to be written by the

next byte, if received. If a STOP condition is detected

after the command byte is received, the MAX9132/

MAX9134/MAX9135 take no further action beyond stor-

ing the command byte. Any bytes that are received

after the command byte are data bytes. The first data

byte goes into the internal register of the crossbar

switch selected by the command byte (Figure 2). If

Programmable, High-Speed, Multiple

Input/Output LVDS Crossbar Switches

______________________________________________________________________________________ 11

ADDRESS

0 DOUT1 preemphasis off

D7 DOUT1 Preemphasis

1 DOUT1 preemphasis on

000 DOUT1 not connected

001 DOUT1 connected to DIN1

010 DOUT1 connected to DIN0

011 DOUT1 connected to DIN2

D[6:4]

DOUT1 Routing

Connection

100 DOUT1 connected to DIN3

0 DOUT0 preemphasis off

D3 DOUT0 Preemphasis

1 DOUT0 preemphasis on

000 DOUT0 not connected

001 DOUT0 connected to DIN1

010 DOUT0 connected to DIN0

011 DOUT0 connected to DIN2

0x01

D[2:0]

DOUT0 Routing

Connection

100 DOUT0 connected to DIN3

D[7:4] Reserved 0000 Set these bits to 0000

0 DOUT2 preemphasis off

D3 DOUT2 Preemphasis

1 DOUT2 preemphasis on

000 DOUT2 not connected

001 DOUT2 connected to DIN1

010 DOUT2 connected to DIN0

011 DOUT2 connected to DIN2

0x02

D[2:0]

DOUT2 Routing

Connection

100 DOUT2 connected to DIN3

Table 2b. I

C Switch Routing Control Registers for the MAX9135

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18 19

MAX9132/MAX9134/MAX9135 1

Comentários a estes Manuais

Sem comentários

Rainbow-electronics MAX9135 Manual do Utilizador Página 11

Comentários a estes Manuais

Manuais e produtos relacionados com Painel de controlo Rainbow-electronics MAX9135