Rainbow-electronics MAX5419 Manual do Utilizador descarregar pdf (Página 10)

MAX5417/MAX5418/MAX5419

256-Tap, Nonvolatile, I

C-Interface,

Digital Potentiometers

10 ______________________________________________________________________________________

Message Format for Writing

A write to the MAX5417/MAX5418/MAX5419 consists of

the transmission of the device’s slave address with the

8th bit set to zero, followed by at least 1 byte of infor-

mation. The 1st byte of information is the command

byte. The bytes received after the command byte are

the data bytes. The 1st data byte goes into the internal

ed by the command byte (Figure 8).

Command Byte

Use the command byte to select the source and desti-

nation of the wiper data (nonvolatile or volatile memory

registers) and swap data between nonvolatile and

volatile memory registers (see Table 2).

Command Descriptions

VREG: The data byte writes to the volatile memory reg-

ister and the wiper position updates with the data in the

volatile memory register.

NVREG: The data byte writes to the nonvolatile memory

NVxREG: Data transfers from the nonvolatile memory

updates).

VxNVREG: Data transfers from the volatile memory reg-

ister into the nonvolatile memory register.

0SLAVE ADDRESS CONTROL BYTE DATA BYTE

ACKNOWLEDGE FROM

MAX5417/MAX5418/MAX5419

NOP/W

1 BYTE

ACKNOWLEDGE FROM

MAX5417/MAX5418/MAX5419

ACKNOWLEDGE FROM

MAX5417/MAX5418/MAX5419

D15 D14 D13 D12 D11 D10 D9 D8 D1 D0D3 D2D5 D4D7 D6

HOW CONTROL BYTE AND DATA BYTE MAP INTO

MAX5417/MAX5418/MAX5419 REGISTERS

S AA

S A0SLAVE ADDRESS CONTROL BYTE

ACKNOWLEDGE FROM

MAX5417/MAX5418/MAX5419

NOP/W

ACKNOWLEDGE FROM

MAX5417/MAX5418/MAX5419

D15 D14 D13 D12 D11 D10 D9 D8

CONTROL BYTE IS STORED ON RECEIPT OF STOP CONDITION

Figure 7. Command Byte Received

Figure 8. Command and Single Data Byte Received

1 2 ... 5 6 7 8 9 10 11 12 13 14

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