Microchip Technology MCP402XEV Manual De Usuario
Installation and Operation
© 2005 Microchip Technology Inc.
DS51546B-page 11
2.3.1
Test Setup
1.
Connect the power supply “+” to V
DD
and the “–” to GND.
2.
Connect the voltmeter to the W terminal and GND.
The voltmeter should reflect the wiper setting with respect to Equation 2-3.
EQUATION 2-3:
POPULATED PCB – VOLTAGE DIVIDER CALCULATION
Using R2 and R3 = 2.5 k
Ω:
• If a 2 k
Ω
MCP4021 is utilized, the output range will be approximately 1.79V to
3.21V.
• If a 5 k
Ω
MCP4021 is utilized, the output range will be approximately 1.25V to
3.75V.
• If a 10 k
Ω
MCP4021 is utilized, the output range will be approximately 0.83V to
4.17V.
• If a 50 k
Ω
MCP4021 is utilized, the output range will be approximately 0.23V to
4.77V.
V
wiper
V
DD
R
wb
R3
+
(
)
⋅
R2
R3
R
AB
+
+
-------------------------------------------
5.0V
d 10k
⋅
(
)
63
⁄
2.5k
+
(
)
⋅
2.5k
2.5k
10k
+
+
---------------------------------------------------------------------
=
=
Where:
d = the wiper setting (0 to 63)