Microchip Technology MCP402XEV Manual De Usuario
Installation and Operation
© 2005 Microchip Technology Inc.
DS51546B-page 9
2.2.3
Evaluating the MCP4023 and MCP4013
The MCP4023/13-XXXI/OT is a 6-pin, grounded digital potentiometer with terminals A
and W available on the device pins. Footprint U2 supports the SOT-23-6 package.
Populating R2 will create a voltage divider with a transfer function illustrated in
Equation 2-2.
and W available on the device pins. Footprint U2 supports the SOT-23-6 package.
Populating R2 will create a voltage divider with a transfer function illustrated in
Equation 2-2.
EQUATION 2-2:
GROUNDED POTENTIOMETER – VOLTAGE DIVIDER
CALCULATION
CALCULATION
2.2.4
Evaluating the MCP4024 and MCP4014
The MCP4024/14-xxxI/OT is a 5-pin, grounded digital rheostat with the W terminals
available on the device pins. Footprint U2 supports the SOT-23-5 package. An “INCR”
command moves the wiper toward terminal A, thus causing the resistance across the
rheostat to increase. A “DECR” command moves the wiper toward terminal B, thus
causing the resistance across the rheostat to decrease.
available on the device pins. Footprint U2 supports the SOT-23-5 package. An “INCR”
command moves the wiper toward terminal A, thus causing the resistance across the
rheostat to increase. A “DECR” command moves the wiper toward terminal B, thus
causing the resistance across the rheostat to decrease.
V
w iper
V
DD
R
w b
⋅
R2
R
nom
+
--------------------------
5.0V
d 10k
⋅
63
⁄
(
)
⋅
2.5k
10k
+
-----------------------------------------------
=
=
Where:
d = the wiper setting (0 to 63)
Note 1:
DO NOT populate U1 if using U2.
2:
The included MCP4021 digital potentiometer samples could be used to
evaluate the MCP4023 simply by shorting terminal B to GND.
evaluate the MCP4023 simply by shorting terminal B to GND.
3:
The MCP4013 has high-voltage tolerant pins and, therefore, accepts
high-voltage Increment and Decrement commands. Since this device is
nonvolatile, the WiperLock™ Technology feature is not present.
high-voltage Increment and Decrement commands. Since this device is
nonvolatile, the WiperLock™ Technology feature is not present.
Note 1:
DO NOT populate U1 if using U2.
2:
The included MCP4021 digital potentiometer samples could be used to
evaluate the MCP4024 simply by not populating R
evaluate the MCP4024 simply by not populating R
2
, letting terminal A
float and by shorting terminal B to GND.
3:
The MCP4014 has high-voltage tolerant pins and, therefore, accepts
high-voltage Increment and Decrement commands. Since this device is
nonvolatile, the WiperLock™ Technology feature is not present.
high-voltage Increment and Decrement commands. Since this device is
nonvolatile, the WiperLock™ Technology feature is not present.