User manual

Installation and Operation
© 2005 Microchip Technology Inc. DS51546B-page 15
11 On the Digital Potentiometer Evaluation Board:
Implement Command #1 (see Table 2-1).
On the Digital Potentiometer Evaluation Board:
Wiper is NOT moved due to the wiper being locked
(WiperLock™ Technology is enabled).
On DMM:
Voltage equals approximately 3.38V.
12 On the Digital Potentiometer Evaluation Board:
Turn off/disconnect power supply.
On DMM:
Voltage equals approximately 0V.
13 On the Digital Potentiometer Evaluation Board:
Re-apply power to Digital Potentiometer Evaluation
Board.
On DMM:
Voltage equals approximately 3.38V. This shows that
the MCP4021 retained the last saved wiper setting.
TABLE 2-2: MEASURING RATIOMETRIC VOLTAGE (CONTINUED)
Step Action Result