MCP4012 Microchip Technology Inc., MCP4012 Datasheet - Page 30

• Manufacturer Part Number: MCP4012
• Description: Low-cost 64-step Volatile Digital Pot
• Manufacturer: Microchip Technology Inc.

MCP4011/2/3/4
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:
DS21978C-page 30
Figure
INCREMENT
IH
) prior to achieving a low state (V
5-1.
Wiper
U/D
CS
Increment.
V
V
IL
IL
IH
X
to ensure that
1
X+1
IL
) on the
2
X+2
IH
3
X+3
4
When the device voltage falls below the RAM retention
voltage of the device, the wiper state may be corrupted.
When the device returns to the operating range, the
wiper will be loaded with the default POR wiper setting.
After the CS pin is driven to V
serial command may immediately be entered.
X+4
Note:
The wiper value will not overflow. That is,
once the wiper value equals 0x3F,
subsequent increment commands are
ignored.
5
© 2006 Microchip Technology Inc.
6
IH
V
V
IH
IH
(from V
IL
), any other