MAX7432A 查看數據表（PDF） - Maxim Integrated

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MAX7432A

Standard Definition Video Reconstruction Filters and Buffers

Maxim Integrated 

Standard Definition Video Reconstruction

Filters and Buffers

Table 5. MAX7432A Control Register

(MSB)

NAME

—

ABSEL3 BYPASS3 CLEVEL3 BOOST1(3) BOOST0(3)

OUT

—

DISABLE3

DEFAULT

0

1

1

0

0

0

0

0

NAME

—

ABSEL2

BYPASS2 CLEVEL2 BOOST1(2) BOOST0(2)

OUT

DISABLE2

—

DEFAULT

0

1

1

0

0

0

0

0

NAME

DEFAULT

—

ABSEL1

BYPASS1 CLEVEL1 BOOST1(1) BOOST0(1)

OUT

DISABLE1

—

0

1

1

0

0

0

0

0

FIRST BIT

(LSB)

Applications Information

Maxim’s Single Pin Bus (MSPB)

Serial Interface

The MSPB interface uses three pulses of different

widths to represent commands and data bits. Figure 4

shows the set of pulses that the single pin interface

uses to communicate with the device. A combination of

the one pulse (t1), zero pulse (t0), transaction pulse (tT),

and prompt pulse (tP), writes to, reads back from, and

sends broadcast data to the devices on the bus.

Note: The zero pulse and prompt pulse are the same.

Initialization pulses are significantly longer and are

used only on power-up or software reset.

ZERO/PROMPT

PULSE

ONE PULSE

t0

tP = t0 = 5μs

t1

t1 = 30μs

TRANSACTION

PULSE

tT

tT = 100μs

Figure 4. MSPB Interface Pulses

Table 6. Boost Level Programming

BOOST1_

0

0

1

1

BOOST0_

0

1

0

1

RELATIVE HIGH

FREQUENCY BOOST

0

0.3dB to 0.5dB

0.6dB to 1.0dB

0.9dB to 1.5dB

Initializing the

MAX7428/MAX7430/MAX7432A

Initialization is performed only after power-up or software

reset. It assigns a unique address to each device on the

bus. The time constant of the capacitor connected to

REXT in parallel with the 300kΩ resistor determines the

order in which the devices are initialized (address

assigned). The device with the largest time constant is

initialized first and so on, in descending order. Table 7

shows the “Initialize Wait” and “Initialize Time” pulse

widths needed for a specific capacitor value and toler-

ance. Program each device on the bus with this com-

mand sequence starting with the device with the biggest

capacitor. To reinitialize a device, cycle the power or use

a software reset. The following is the command

sequence and timing diagram (Figure 5) for initialization

as shown below. Chip ID is entered LSB first.

Note: If there is only one device on the bus, no initial-

ization is needed. Communicate to the device using the

broadcast command described on page 13.

______________________________________________________________________________________ 11

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