Datasheet

WIPER Command
The data byte writes to the wiper register and the
potentiometer moves to the appropriate position. D[7:0]
indicates the position of the wiper. D[7:0] = 0x00 moves
the wiper to the position closest to L. D[7:0] = 0xFF moves
the wiper closest to H. D[7:0] = 0x80 following power-on.
SD_CLR Command
Removes any existing shutdown condition. Connects all
potentiometer terminals and returns the wiper to the value
stored in the wiper register. The command does not affect
the current status of the charge pump.
SD_H_WREG Command
Opens the H terminal and maintains the wiper at the
wiper register location. Writes cannot be made to the
wiper register while shutdown mode is engaged. Clearing
shutdown mode will close the H terminal and allow the
wiper register to be written. A RST will also deassert
shutdown mode and return the wiper to midscale (0x80).
This command does not affect the charge-pump status.
SD_H_ZERO Command
Moves wiper to zero-scale position (0x00) and opens the
H terminal. The wiper register remains unaltered. Writes
cannot be made to the wiper register while shutdown
mode is engaged. Clearing shutdown mode will return the
wiper to the position contained in the wiper register and
close the H terminal. A RST will also deassert shutdown
mode and return the wiper to midscale (0x80). This
command does not affect the charge-pump status.
SD_H_MID Command
Moves wiper to midscale position (0x80) and opens the
H terminal. The wiper register remains unaltered. Writes
cannot be made to the wiper register while shutdown
mode is engaged. Clearing shutdown mode will return the
wiper to the position contained in the wiper register and
close the H terminal. A RST will also deassert shutdown
mode and return the wiper to midscale (0x80). This
command does not affect the charge-pump status.
SD_H_FULL Command
Moves wiper to full-scale position (0xFF) and opens the
H terminal. The wiper register remains unaltered. Writes
cannot be made to the wiper register while shutdown
mode is engaged. Clearing shutdown mode will return the
wiper to the position contained in the wiper register and
close the H terminal. A RST will also deassert shutdown
mode and return the wiper to midscale (0x80). This
command does not affect the charge-pump status.
Table 3. I
2
C Write Command Byte Summary
COMMAND ADDRESS BYTE COMMAND BYTE DATA BYTE
S
A6 A5 A4 A3 A2 A1 A0 R/W
A
C7 C6 C5 C4 C3 C2 C1 C0
A
D7 D6 D5 D4 D3 D2 D1 D0
A P
WIPER
See Table 1
0 0 0 0 0 0 0 0 0 D7 D6 D5 D4 D3 D2 D1 D0
SD_CLR 0 1 0 0 0 0 0 0 0
Don’t Care
SD_H_WREG 0 1 0 0 1 0 0 0 0
SD_H_ZERO 0 1 0 0 1 0 0 0 1
SD_H_MID 0 1 0 0 1 0 0 1 0
SD_H_FULL 0 1 0 0 1 0 0 1 1
SD_L_WREG 0 1 0 0 0 1 0 0 0
SD_L_ZERO 0 1 0 0 0 1 0 0 1
SD_L_MID 0 1 0 0 0 1 0 1 0
SD_L_FULL 0 1 0 0 0 1 0 1 1
SD_W 0 1 0 0 0 0 1 X X
QP_OFF 0 1 0 1 0 0 0 0 0
QP_ON 0 1 0 1 0 0 0 0 1
RST 0 1 1 0 0 0 0 0 0
MAX5395 Single, 256-Tap Volatile, I
2
C, Low-Voltage Linear
Taper Digital Potentiometer
www.maximintegrated.com
Maxim Integrated │ 14