MCP4017T-503E/LT Microchip Technology, MCP4017T-503E/LT Datasheet - Page 51
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MCP4017T-503E/LT
Manufacturer Part Number
MCP4017T-503E/LT
Description
IC DGTL POT 50K 128TAPS SC70-6
Manufacturer
Microchip Technology
Datasheet
1.MCP4018T-502ELT.pdf
(66 pages)
Specifications of MCP4017T-503E/LT
Package / Case
SC-70-6, SC-88, SOT-363
Temperature Coefficient
150 ppm/°C Typical
Taps
128
Resistance (ohms)
50K
Number Of Circuits
1
Memory Type
Volatile
Interface
I²C, 2-Wire Serial
Voltage - Supply
1.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Resistance In Ohms
50K
Number Of Pots
Single
Taps Per Pot
128
Resistance
50 KOhms
Wiper Memory
Volatile
Buffered Wiper
Buffered
Digital Interface
Serial (2-Wire, I2C)
Operating Supply Voltage
2.5 V or 3.3 V or 5 V
Supply Current
0.045 mA (Typ)
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Description/function
7 Bit Single I2C Digital Rheostat
Mounting Style
SMD/SMT
Supply Voltage (max)
5.5 V
Supply Voltage (min)
1.8 V
Tolerance
20 %
End To End Resistance
50kohm
Track Taper
Linear
No. Of Steps
128
Resistance Tolerance
± 20%
Supply Voltage Range
1.8V To 5.5V
Control Interface
I2C
No. Of Pots
Single
Rohs Compliant
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
MCP4017T-503E/LTTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCP4017T-503E/LT
Manufacturer:
AMS
Quantity:
2 300
Part Number:
MCP4017T-503E/LT
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
8.3
Thermistors are resistors with very predictable
variation with temperature. Thermistors are a popular
sensor choice when a low-cost temperature-sensing
solution is desired. Unfortunately, thermistors have
non-linear characteristics that are undesirable, typically
requiring trimming in an application to achieve greater
accuracy. There are several common solutions to trim
& linearize thermistors.
simple methods for linearizing a 3-terminal NTC
thermistor. Both are simple voltage dividers using a
Positive Temperature Coefficient (PTC) resistor (R
with a transfer function capable of compensating for the
linearity error in the Negative Temperature Coefficient
(NTC) thermistor.
The circuit, illustrated by
rheostat for trimming the offset error caused by the
thermistor’s part-to-part variation. This solution puts the
digital potentiometer’s R
calculation. The MCP4017/18/19’s R
coefficient is a low 50 ppm (-20°C to +70°C). R
is substantially greater than R
varies with V
50 kΩ devices, the error introduced by R
cases, insignificant as long as the wiper setting is > 6.
For the 2 kΩ devices, the error introduced by R
significant because it is a higher percentage of R
For these reasons, the circuit illustrated in
not the most optimum method for “exciting” and
linearizing a thermistor.
FIGURE 8-5:
a Digital Potentiometer in a Rheostat
Configuration.
© 2009 Microchip Technology Inc.
Temperature Sensor Applications
DD
R
1
, wiper setting and temperature. For the
Thermistor Calibration using
V
Figure 8-5
DD
W
Figure
R
NTC
Thermistor
into the voltage divider
2
V
AB
MCP4017
OUT
’s error because R
8-5, utilizes a digital
and
AB
Figure 8-6
W
Figure 8-5
temperature
is, in most
W
’s error
W
WB
are
1
W
is
is
)
.
The circuit illustrated by
potentiometer for trimming the offset error. This
solution removes R
with the error associated with R
but can be utilized to reduce the trimming “window” and
reduce variation due to the digital pot’s R
variability.
FIGURE 8-6:
a Digital Potentiometer in a Potentiometer
Configuration.
R
MCP4017/18/19
1
W
from the trimming equation along
Thermistor Calibration using
V
DD
Figure 8-6
NTC
Thermistor
MCP4018
W
V
. R
OUT
DS22147A-page 51
2
utilizes a digital
is not required,
AB
part-to-part