MAX5395 MAXIM [Maxim Integrated Products], MAX5395 Datasheet - Page 13

• Manufacturer Part Number: MAX5395
• Description: Single, 256-Tap Volatile, I2C, Low-Voltage Linear Taper Digital Potentiometer
• Manufacturer: MAXIM [Maxim Integrated Products]

a read and an acknowledge clock. The master has con-
trol of the SCL line but the MAX5395 takes over the SDA
line. The final byte in the frame contains the register data
readback followed by a STOP condition. If additional
bytes beyond those required to read back the requested
data are provided, the MAX5395 will continue to read
back ones.
The wiper register and the configuration register are
the only two registers that support readback
Readback of all other registers is not supported and
results in the readback of ones.
D[7:0]: Wiper position
QP: Charge pump status, 1 is enabled, 0 is disabled.
HSW: H terminal switch status, 0 is closed, 1 is open
WSW: W terminal switch status, 0 is closed, 1 is open
LSW: L terminal switch status, 0 is closed, 1 is open
Table 2. I
Figure 6. Standard I
REGISTER
CONFIG
WIPER
Single, 256-Tap Volatile, I
SDA
SCL
2
START
C READ Command Byte Summary
C7
0
1
ACK. GENERATED BY MAX5395L/
MAX5395M/MAX5395N
2
BYTE #1: I
C Register Read Sequence
0 1 0 1 0 A1 A0 W
C6
WRITE ADDRESS
0
0
2
C SLAVE ADDRESS
C5
0
0
COMMAND BYTE
C4
0
0
A
BYTE #2: COMMAND BYTE
SEE REGISTER OPTIONS
WRITE COMMAND
C3
0
0
(Table
C2
0
0
Taper Digital Potentiometer
2).
C1
0
0
A
REPEATED
START
C0
TSEL[1:0]: Tap select, 00- wiper is at contents of wiper
register, 01 – wiper is at 0x00, 10 – wiper is at 0x80, 11
– wiper is at 0xFF.
The MAX5395 supports software reset through general
call address 0x00 followed by R/W = 0, followed by 0x06
data. A software reset of the MAX5395 will return the part
to the power-on default
ACK the general call address and any command byte
following, but will not support any general call features
other than software reset.
0
0
BYTE #3: I
2
0
1 0 1 0
C, Low-Voltage Linear
READ ADDREESS
D7
D7
QP
2
C SLAVE ADDRESS
D6
D6
A1 A0 R A
0
ACK. GENERATED BY I
D5
D5
0
BYTE #4: DATA BYTE B[7:0]
D D D D D D D D ~A
DATA BYTE
HSW
conditions.
D4
D4
READ DATA
2
C MASTER
LSW
D3
D3
General Call Support
MAX5395
The MAX5395 will
WSW
D2
D2
STOP
D1
D1
TSEL[1:0]
D0
D0
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