MCP4332T-503E/ML MICROCHIP [Microchip Technology], MCP4332T-503E/ML Datasheet - Page 79
![no-image](/images/no-image-200.jpg)
MCP4332T-503E/ML
Manufacturer Part Number
MCP4332T-503E/ML
Description
7/8-Bit Quad SPI Digital POT with Volatile Memory
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.MCP4332T-503EML.pdf
(88 pages)
- Current page: 79 of 88
- Download datasheet (6Mb)
APPENDIX B:
Some designers may desire to understand the device
operational characteristics outside of the specified
operating conditions of the device.
Applications where the knowledge of the resistor
network characteristics could be useful include battery
powered devices and applications that experience
brown-out conditions.
In battery applications the application voltage decays
over time until new batteries are installed. As the
voltage decays, the system will continue to operate. At
some voltage level, the application will be below its
specified operating voltage range. This is dependent
on the individual components used in the design. It is
still useful to understand the device characteristics to
expect when this low-voltage range is encountered.
Unlike a microcontroller which can use an external
supervisor device to force the controller into the Reset
state, a digital potentiometer’s resistance characteristic
is not specified. But understanding the operational
characteristics can be important in the design of the
applications circuit for this low-voltage condition.
Other application system scenarios where understand-
ing the low-voltage characteristics of the resistor net-
work could be important is for system brown out
conditions.
For the MCP433X/435X devices, the analog operation
is specified at a minimum of 2.7V. Device testing has
Terminal A connected to the device V
potentiometer configuration only) and Terminal B
connected to V
2010 Microchip Technology Inc.
SS
.
CHARACTERIZATION
DATA ANALYSIS
DD
(for
B.1
This
semiconductor characteristics at lower voltages. This is
important
characterization graphs of the MCP433X/435X devices
can be better understood.
For this discussion, we will use the 5 k device data.
This data was chosen since the variations of wiper
resistance has much greater implications for devices
with smaller R
Figure B-1
average R
the R
behavior occurs at approximately wiper code 160. This
is better shown in
resistance changes from a linear slope. This change is
due to the change in the wiper resistance.
FIGURE B-1:
from Average R
and Temperature (V
FIGURE B-2:
Temperature (V
7000
6000
5000
4000
3000
2000
1000
BW
-1.00%
-2.00%
-3.00%
-4.00%
-5.00%
-6.00%
-7.00%
2.00%
1.00%
0.00%
appendix
0
resistance verse wiper code graph. Nonlinear
Low-Voltage Operation
0
BW
0
shows the worst case R
so
as a percentage, while
32
AB
MCP433X/435X
32
that
resistances.
BW
DD
gives
64
64
= 1.8V, I
(R
DD
1.8V Worst Case R
R
the
Figure
BW0
96
BW
96
Wiper Code
= 1.8V, I
an
Wiper Code
-R
vs. Wiper Code And
128
1.8V
128
W
B-2, where the R
BW3
overview
= 190
160
160
W
) vs. Wiper Code
resistor
BW
DS22242A-page 79
Figure B-2
= 190
192
192
µ
error from the
A).
of
-40C
+25C
+85C
+125C
224
224
BW
-40C
+25C
+85C
+125C
µ
A).
network
CMOS
shows
Error
256
256
BW
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