MCP4461T-502E/ML Microchip Technology, MCP4461T-502E/ML Datasheet - Page 73

• Manufacturer Part Number: MCP4461T-502E/ML
• Description: IC DGTL POT 257TAPS 5K 20QFN
• Manufacturer: Microchip Technology

Specifications of MCP4461T-502E/ML

• Package / Case: 20-VFQFN Exposed Pad
• Temperature Coefficient: 150 ppm/°C Typical
• Taps: 257
• Resistance (ohms): 5K
• Number Of Circuits: 4
• Memory Type: Non-Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Number Of Pots: Quad
• Taps Per Pot: 257
• Resistance: 5 KOhms
• Wiper Memory: Non Volatile
• Buffered Wiper: Buffered
• Digital Interface: I2C
• Operating Supply Voltage: 2.7 V to 5.5 V
• Supply Current: 600 uA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Description/function: Quad I2C Digital POT with Nonvolatile Memory
• Mounting Style: SMD/SMT
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.0
Nonvolatile digital potentiometers have a multitude of
practical uses in modern electronic circuits. The most
popular uses include precision calibration of set point
thresholds, sensor trimming, LCD bias trimming, audio
attenuation, adjustable power supplies, motor control
overcurrent trip setting, adjustable gain amplifiers and
offset trimming. The MCP44XX devices can be used to
replace
applications where the operating and terminal voltages
are within CMOS process limitations (V
5.5V).
8.1
The circuit in
TC1240A doubling charge pump. When the SHDN pin
is high, the TC1240A is off, and the level on the HVC/
A0 pin is controlled by the PIC® microcontrollers
(MCUs) IO2 pin.
When the SHDN pin is low, the TC1240A is on and the
V
HVC/A0 pin to go higher than the voltage such that the
PIC MCU’s IO2 pin “clamps” at approximately V
FIGURE 8-1:
Generate the V
© 2010 Microchip Technology Inc.
OUT
PIC MCU
voltage is 2 * V
APPLICATIONS EXAMPLES
Techniques to Force the HVC/A0
Pin to V
IO1
IO2
the
Figure 8-1
common
IHH
IHH
Voltage.
R
Using the TC1240A to
DD
1
SHDN
V
. The resistor R
TC1240A
IN
shows a method using the
mechanical
V
OUT
HVC/A0
C
C+
2
C-
trim
DD
MCP4XXX
1
allows the
= 2.7V to
C
pot
DD
1
.
in
The circuit in
MCP402X Nonvolatile Digital Potentiometer Evaluation
Board (Part Number: MCP402XEV). This method
requires that the system voltage be approximately 5V.
This ensures that when the PIC10F206 enters a brown-
out condition, there is an insufficient voltage level on
the HVC/A0 pin to change the stored value of the wiper.
The MCP402X Nonvolatile Digital Potentiometer Eval-
uation Board User’s Guide (DS51546) contains a
complete schematic.
GP0 is a general purpose I/O pin, while GP2 can either
be a general purpose I/O pin or it can output the internal
clock.
For the serial commands, configure the GP2 pin as an
input (high impedance). The output state of the GP0 pin
will determine the voltage on the HVC/A0 pin (V
V
For high-voltage serial commands, force the GP0
output pin to output a high level (V
GP2 pin to output the internal clock. This will form a
charge pump and increase the voltage on the CS pin
(when the system voltage is approximately 5V).
FIGURE 8-2:
Digital Potentiometer Evaluation Board
(MCP402XEV) implementation to generate the
V
IH
IHH
PIC10F206
).
voltage.
GP0
GP2
Figure 8-2
MCP444X/446X
C
1
MCP4XXX Nonvolatile
shows the method used on the
R
1
OH
) and configure the
DS22265A-page 73
C
2
HVC/A0
MCP4XXX
IL
or