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MCP4021 数据表(PDF) 39 Page - Microchip Technology

部件名 MCP4021
功能描述  Low-Cost NV Digital POT with WiperLock??Technology
PDF  64 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP4021 数据表(HTML) 39 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
DS21945E-page 39
MCP4021/2/3/4
5.2.10
WRITE WIPER SETTING TO
EEPROM AND DISABLE WiperLock
TECHNOLOGY
This mode is achieved by keeping the U/D pin static
(either at VIL or at VIH), while the CS pin is driven from
VIH to VIHH and then returned to VIH. When the falling
edge of the CS pin occurs (from VIHH to VIH), the wiper
value is written to EEPROM and the WiperLock
Technology is disabled (See Figure 5-10).
To ensure that “unexpected” transitions on the U/D pin
do not cause the wiper setting to change, force the CS
pin to VIH as soon as possible (within device
specifications) after the CS pin is forced to VIHH.
After the CS pin is driven to VIH (from VIHH), all other
serial commands are ignored until the EEPROM write
cycle (tWC) completes.
FIGURE 5-10:
Write Wiper Setting to EEPROM and Disable WiperLock™ Technology.
EEPROM
U/D
CS
Wiper
WiperLock™ Technology
X+4
X
X+4
WiperLock Technology Enable
WiperLock Technology Disable
VIHH
VIH
VIL
VIH
VIH
tWC



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