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MCP4021 датащи(PDF) 38 Page - Microchip Technology

номер детали MCP4021
подробное описание детали  Low-Cost NV Digital POT with WiperLock??Technology
PDF  64 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP4021 датащи(HTML) 38 Page - Microchip Technology

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MCP4021/2/3/4
DS21945E-page 38
© 2006 Microchip Technology Inc.
5.2.9
HIGH-VOLTAGE DECREMENT AND
ENABLE WiperLock TECHNOLOGY
This mode is achieved by initializing the U/D pin to the
low state (VIL) prior to driving the CS pin to VIHH.
Subsequent rising edges of the U/D pin decrement the
wiper setting toward terminal B. Set the U/D pin to a
high state (VIH) prior to forcing the CS pin to VIH. This
begins a write cycle and enables the WiperLock
Technology feature (See Figure 5-9).
After the CS pin is driven to VIH (from VIHH), all other
serial commands are ignored until the EEPROM write
cycle (tWC) completes.
FIGURE 5-9:
High-Voltage Decrement and Enable WiperLock™ Technology.
Note:
The wiper value will not underflow. That is,
once the wiper value equals 0x00,
subsequent decrement commands are
ignored.
EEPROM
U/D
CS
Wiper
1
2
3
4
WiperLock™ Technology
WiperLock Technology Enable
WiperLock Technology Disable
X
XX
X
X
X-4
X-1
X
X-2
X-3
X-4
VIHH
VDD
VIH
VIH
5
6
VIH
VIL
tWC



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