MAX5432META 查看數據表（PDF） - Maxim Integrated
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MAX5432META Datasheet PDF : 17 Pages
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32-Tap, Nonvolatile, I2C, Linear, Digital
Potentiometers
VDD
IOL = 3mA
SDA
VOUT
400pF
IOH = 0mA
SDA
SCL
S
START
CONDITION
Figure 2. Load Circuit
Figure 3. Start and Stop Conditions
P
STOP
CONDITION
SDA
0
1
MSB
SCL
0
1
*SEE THE Selector Guide FOR OTHER ADDRESS OPTIONS.
0*
0*
A0
NOP/W
ACK
LSB
Figure 4. Slave Address
Command Byte
Use the command byte to select the destination of the
wiper data (nonvolatile or volatile memory registers)
and swap data between nonvolatile and volatile memo-
ry registers (see Table 2).
Data Byte
The MAX5432–MAX5435 use the first 5 bits (MSBs,
D7–D3) of the data byte to set the position of the wiper.
The last 3 bits (D2, D1, and D0) are don’t care bits (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
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 memory
register into the nonvolatile memory register.
Table 2. Command Byte Summary
REGISTER
SCL CYCLE
NUMBER
VREG
NVREG
NVREGxVREG
VREGxNVREG
X = Don’t care.
ADDRESS BYTE
12345678
N
A6 A5 A4 A3 A2 A1 A0 O
P/
W
0 1 0 1 A2 A1 A0 0
0 1 0 1 A2 A1 A0 0
0 1 0 1 A2 A1 A0 0
0 1 0 1 A2 A1 A0 0
COMMAND BTYE
DATA BYTE
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
A
A
A
C C7 C6 C5 C4 C3 C2 C1 C0 C D7 D6 D5 D4 D3 D2 D1 D0 C
K
K
K
00010001
00100001
01100001
01010001
D7 D6 D5 D4 D3 X X X
D7 D6 D5 D4 D3 X X X
D7 D6 D5 D4 D3 X X X
D7 D6 D5 D4 D3 X X X
10 ______________________________________________________________________
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