Datasheet

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_L_ZERO Command
Moves wiper to zero-scale position (0x00) and opens the
L 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 L 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_L_MID Command
Moves wiper to midscale position (0x80) and opens the
L 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 L 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_L_FULL Command
Moves wiper to full-scale position (0xFF) and opens the
L 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 L 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_W Command
Opens the W terminal keeping the internal tap position
the same as the wiper register. Writes cannot be made
to the wiper registers while shutdown mode is engaged.
Clearing shutdown mode will return the wiper to the
position contained in the wiper register and close W
terminal. A RST will also deassert shutdown mode and
return the wiper to midscale (0x80). This command does
not affect the charge-pump status.
QP_ON Command
Enables the onboard charge pump to allow low-supply
voltage operation. This is the power-on default condition.
Low supply voltage is 1.7V.
QP_OFF Command
Disables the on-board charge pump and places device in
low power mode. Low supply voltage is limited to 2.6V.
RST Command
Returns device to power-on default conditions. Resets the
wiper register to midscale (0x80), enables charge pump,
and deasserts any shutdown modes.
MAX5394 Single, 256-Tap Volatile, SPI, Low-Voltage Linear
Taper Digital Potentiometer
www.maximintegrated.com
Maxim Integrated │ 13