Microchip Technology MCP402XEV User Manual
MCP401X/2X Evaluation Board User’s Guide
DS51546B-page 10
© 2005 Microchip Technology Inc.
2.3
TEST AND OPERATING INSTRUCTIONS
The populated PCB is configured to create a voltage divider from V
DD
to V
SS
using a
2.5 k
Ω
pull-up resistor (R2), the MCP4021-103I/SN (10 k
Ω
) and a 2.5 k
Ω
pull-down
resistor (R3). To quickly evaluate the digital potentiometer’s performance, the following
test equipment is required:
test equipment is required:
• 2.7V to 5.5V power supply
• Voltmeter or Digital Multimeter (DMM)
Figure 2-1 shows the Digital Potentiometer Evaluation Board PCB, components and
the connection points that will be used in the step-by-step demonstration.
the connection points that will be used in the step-by-step demonstration.
FIGURE 2-1:
Digital Potentiometer Evaluation Board Overview.
Increment (INCR)
Decrement (DECR)
Digital
Potentiometer
Node A Pad
Potentiometer
Node A Pad
Digital
Potentiometer
Node B Pad
Potentiometer
Node B Pad
Digital
Potentiometer
Wiper W Pad
Potentiometer
Wiper W Pad
Switch
Switch
Resistor R2
(A to VDD)
(A to VDD)
Resistor R3
(B to GND)
(B to GND)
Baseline Flash MCU
Programmer (BFMP)
Interface
Programmer (BFMP)
Interface