Datasheet

MCP4011/2/3/4
DS21978C-page 34 © 2006 Microchip Technology Inc.
5.2.5 HIGH-VOLTAGE INCREMENT 1
(FOR MCP402X COMPATIBILITY)
This mode is achieved by initializing the U/D
pin to a
high state (V
IH
) prior to the CS pin being driven to V
IHH
.
Subsequent rising edges of the U/D pin increment the
wiper setting toward terminal A. Set the U/D
pin to the
high state (V
IH
) prior to forcing the CS pin to V
IH
. This
is shown in Figure 5-5.
After the CS
pin is driven to V
IH
(from V
IL
), any other
serial command may immediately be entered.
FIGURE 5-5: High-Voltage Increment 1 (For MCP402X Compatibility).
Note: This command allows compatibility with
the MCP402X family, which supports
updating of the non-volatile wiper setting
with the WiperLock Technology feature.
Note: The wiper value will not overflow. That is,
once the wiper value equals 0x3F,
subsequent increment commands are
ignored.
U/D
CS
Wiper
1 2 3 4
X+1
X
X+2 X+3 X+4
V
IHH
V
IH
V
IH
V
IH
5
6
V
IL
V
IH