MAX5419 データシートの表示（PDF） - Maxim Integrated
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MAX5419 Datasheet PDF : 14 Pages
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256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
CONTROL BYTE IS STORED ON RECEIPT OF STOP CONDITION
ACKNOWLEDGE FROM
MAX5417/MAX5418/MAX5419
D15 D14 D13 D12 D11 D10 D9 D8
S
SLAVE ADDRESS
0A
CONTROL BYTE
AP
NOP/W
ACKNOWLEDGE FROM
MAX5417/MAX5418/MAX5419
Figure 7. Command Byte Received
HOW CONTROL BYTE AND DATA BYTE MAP INTO
MAX5417/MAX5418/MAX5419 REGISTERS
ACKNOWLEDGE FROM
MAX5417/MAX5418/MAX5419
ACKNOWLEDGE FROM
MAX5417/MAX5418/MAX5419
D15 D14 D13 D12 D11 D10 D9 D8
ACKNOWLEDGE FROM
MAX5417/MAX5418/MAX5419
D7 D6 D5 D4 D3 D2 D1 D0
S
SLAVE ADDRESS
0A
CONTROL BYTE
A
DATA BYTE
AP
NOP/W
1 BYTE
Figure 8. Command and Single Data Byte Received
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 (Figure 7). 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 register of the MAX5417/MAX5418/MAX5419 as
selected 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 memo-
ry register. The wiper position is unchanged.
NVREGxVREG: Data transfers from the nonvolatile
memory register to the volatile memory register (wiper
position updates).
VREGxNVREG: Data transfers from the volatile memo-
ry register into the nonvolatile memory register.
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