MCP42050-I/P Microchip Technology, MCP42050-I/P Datasheet - Page 16
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MCP42050-I/P
Manufacturer Part Number
MCP42050-I/P
Description
IC POT DGTL 50K 2CH SPI 14-DIP
Manufacturer
Microchip Technology
Datasheet
1.MCP41010-ISN.pdf
(32 pages)
Specifications of MCP42050-I/P
Temperature Coefficient
800 ppm/°C Typical
Taps
256
Resistance (ohms)
50K
Number Of Circuits
2
Memory Type
Non-Volatile
Interface
SPI, 3-Wire Serial
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
14-DIP (0.300", 7.62mm)
Resistance In Ohms
50K
End To End Resistance
50kohm
Track Taper
Linear
No. Of Steps
256
Supply Voltage Range
2.7V To 5.5V
Control Interface
Serial, SPI
No. Of Pots
Dual
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MCP42050-I/PR
MCP42050-I/PR
MCP42050-I/PR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCP42050-I/P
Manufacturer:
MICROCHIP
Quantity:
12 000
Part Number:
MCP42050-I/P
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
MCP41XXX/42XXX
FIGURE 4-7:
programmable differential amplifier using digital
potentiometers.
4.2.3
For applications requiring only a programmable voltage
reference, the circuit in Figure 4-8 can be used. This
circuit shows the device used in the potentiometer
mode along with two resistors and a buffered output.
This creates a circuit with a linear relationship between
voltage-out and programmed code. Resistors R
R
age step size. The potentiometer in this mode is stable
over temperature. The operation of this circuit over
temperature is shown in Figure 2-3. The worst perfor-
mance over temperature will occur at the lower codes
due to the dominating wiper resistance. R
also be used to affect the boundary voltages, thereby
eliminating the use of these lower codes.
FIGURE 4-8:
R
programmable voltage reference circuit is
affected.
DS11195C-page 16
2
1
(SIG +)
can be used to increase or decrease the output volt-
(SIG -)
and R
R
R
D
Where:
V
V
NOTE: Potentiometer values must be equal
A
AB
n
A
B
=
=
R
=
2
R
Wiper setting forD
R
-------------------------------------- -
2
MCP42010
, the voltage output resolution of this
PROGRAMMABLE OFFSET TRIM
1
A
B
Total Resistance of pot
A
AB
V
V
V
1/2
REF
DD
256 D
256
SS
A
B
B
+IN
-IN
–
+IN
0.1 uF
-IN
Single Supply
By changing the values of
+
-
n
MCP601
+
-
MCP606
V
R
V
n
V
OUT
V
SS
B
V
DD
=
SS
DD
=
0 to 255
=
R
----------------- -
OUT
256
AB
V
D
A
n
1
–
and R
V
B
V
R
------ -
R
OUT
1
B
A
2
and
can
4.3
When programming the digital potentiometer settings,
the following equations can be used to calculate the
resistances. Programming code 00h effectively brings
the wiper to the B terminal, leaving only the wiper resis-
tance. Programming higher codes will bring the wiper
closer to the A terminal of the potentiometer. The equa-
tions in Figure 4-9 can be used to calculate the terminal
resistances. Figure 4-10 shows an example calculation
using a 10 k potentiometer.
FIGURE 4-9:
are a function of code. It should be noted that,
when using these equations for most feedback
amplifier circuits (see Figure 4-4 and Figure 4-5),
the wiper resistance can be omitted due to the
high impedance input of the amplifier.
FIGURE 4-10:
calculations.
Where:
PA is the A terminal
PB is the B terminal
PW is the wiper terminal
R
R
R
R
D
WA
WB
AB
W
n
10 k
Note: All values shown are typical and
is 8-bit value in data register for pot number n
R
R
R
R
is wiper resistance
R
is overall resistance for pot (10 k , 50 k
is resistance between Terminal A and wiper
is resistance between Terminal B and Wiper
R
WA
WA
WB
WB
Calculating Resistances
WA
WB
R
R
WA
WB
actual results will vary.
C0h
C0h
C0h
C0h
D
D
n
n
D
D
n
n
=
=
=
=
=
=
------------------------------------------- -
=
=
PA
PW
PB
R
--------------------------- -
-------------------------------------------------- -
2552
---------------------------------- -
7552
R
10k
10k
Potentiometer resistances
Example Resistance
AB
------------------------------------------- -
--------------------------- -
AB
R
R
256
AB
AB
2003 Microchip Technology Inc.
256
256
256
256 D
D
256
256
256 192
n
192
256 D
D
Example:
R = 10 k
Code = C0h = 192d
–
n
PA
PW
PB
+
–
R
–
+
n
+
W
R
52
+
n
W
R
or 100 k )
+
W
+
R
52
W