MCP4023 Microchip Technology, MCP4023 Datasheet - Page 30

• Manufacturer Part Number: MCP4023
• Description: Low-Cost NV Digital POT with WiperLock Technology
• Manufacturer: Microchip Technology

MCP4021/2/3/4
5.2.1
This mode is achieved by initializing the U/D pin to a
high state (V
CS pin. Subsequent rising edges of the U/D pin
increment the wiper setting toward terminal A. This is
shown in
After the wiper is incremented to the desired position,
the CS pin should be forced to V
“unexpected” transitions (on the U/D pin do not cause
the wiper setting to increment. Driving the CS pin to V
should occur as soon as possible (within device
specifications) after the last desired increment occurs.
FIGURE 5-1:
DS21945E-page 30
WiperLock™ Technology
Figure
INCREMENT WITHOUT WRITING
WIPER SETTING TO EEPROM
IH
) prior to achieving a low state (V
5-1.
EEPROM
Increment without Writing Wiper Setting to EEPROM.
Wiper
U/D
CS
Note: If WiperLock technology enabled, wiper will not move.
IH
to ensure that
V
V
IL
IL
X
X
IL
1
) on the
X+1
X
IH
2
X+2
X
3
The EEPROM value has not been updated to this new
wiper value, so if the device voltage is lowered below
the RAM retention voltage of the device, once the
device returns to the operating range, the wiper will be
loaded with the wiper setting in the EEPROM.
After the CS pin is driven to V
serial command may immediately be entered. This is
since an EEPROM write cycle (t
X+3
X
Note:
4
X+4
X
The wiper value will not overflow. That is,
once the wiper value equals 0x3F,
subsequent increment commands are
ignored.
WiperLock Technology Enable
WiperLock Technology Disable
© 2006 Microchip Technology Inc.
5
IH
6
wc
(from V
) is not active.
V
V
IH
IH
IL
), any other