MAX5432 MAXIM [Maxim Integrated Products], MAX5432 Datasheet - Page 10

• Manufacturer Part Number: MAX5432
• Description: 32-Tap, Nonvolatile, I2C, Linear, Digital Potentiometers
• Manufacturer: MAXIM [Maxim Integrated Products]

32-Tap, Nonvolatile, I
Potentiometers
X = Don’t care.
Figure 2. Load Circuit
Figure 4. Slave Address
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).
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).
Table 2. Command Byte Summary
NVREGxVREG
VREGxNVREG
SCL CYCLE
NUMBER
NVREG
REGISTER
VREG
SDA
SCL
*SEE THE Selector Guide FOR OTHER ADDRESS OPTIONS.
MSB
0
SDA
A6 A5 A4 A3 A2 A1 A0
10
1
0
0
0
0
2
1
1
1
1
______________________________________________________________________
ADDRESS BYTE
3
0
0
0
0
1
V
DD
4
1
1
1
1
I
I
OL
OH
A2 A1 A0
A2 A1 A0
A2 A1 A0
A2 A1 A0
= 3mA
= 0mA
5
6
400pF
0
V
OUT
7
Command Byte
P/
W
N
O
8
0
0
0
0
Data Byte
9
A
C
K
1
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
C7 C6 C5 C4 C3 C2 C1 C0
0
0
0
0
2
0
0
1
1
C, Linear, Digital
COMMAND BTYE
0
1
1
0
0*
1
0
0
1
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.
Figure 3. Start and Stop Conditions
SDA
SCL
CONDITION
0
0
0
0
START
S
0
0
0
0
0*
0
0
0
0
1
1
1
1
C
A
K
LSB
A0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3
D7 D6 D5 D4 D3
D7 D6 D5 D4 D3
D7 D6 D5 D4 D3
DATA BYTE
NOP/W
Command Descriptions
X
X
X
X
ACK
X
X
X
X
X
X
X
X
CONDITION
STOP
C
A
K
P