MCP4023 Microchip Technology, MCP4023 Datasheet - Page 34

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

MCP4021/2/3/4
5.2.5
To write the current wiper setting to EEPROM, force
both the CS pin and U/D pin to V
pin to V
force the CS pin to V
value to be written to EEPROM.
FIGURE 5-5:
DS21945E-page 34
Note:
IL
WiperLock™ Technology
. Before there is a rising edge on the U/D pin,
WRITE WIPER SETTING TO
EEPROM
After the U/D pin is forced to V
rising edge on the U/D pin will cause the
wiper to increment.
This is the same command as the
ment with Writing Wiper Setting to
EEPROM“ command, but the U/D pin is
held at V
mented.
IH
EEPROM
IL,
Write Wiper Setting to EEPROM.
. This causes the wiper setting
so the wiper is not incre-
Wiper
U/D
CS
IH
. Then force the CS
V
V
IH
IH
X
X+4
V
IL
IL
“Incre-
, each
When the CS pin is forced to V
written to the EEPROM. Therefore, 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 this wiper setting
(stored in the EEPROM).
To ensure that “unexpected” transitions on the U/D pin
do not cause the wiper setting to increment, force the
CS pin to V
specifications) after the U/D pin is forced to V
After the CS pin is driven to V
serial commands are ignored until the EEPROM write
cycle (t
WC
) completes.
IH
t
WC
WiperLock Technology Enable
WiperLock Technology Disable
as soon as possible (within device
X+4
© 2006 Microchip Technology Inc.
5
IH
6
IH
(from V
, the wiper value is
V
V
IL
IH
IL
), all other
IL
.