MCP4662-103E/UN Microchip Technology, MCP4662-103E/UN Datasheet - Page 67

• Manufacturer Part Number: MCP4662-103E/UN
• Description: IC DGTL POT 10K 256TAPS 10-MSOP
• Manufacturer: Microchip Technology

Specifications of MCP4662-103E/UN

• Taps: 257
• Resistance (ohms): 10K
• Number Of Circuits: 2
• Temperature Coefficient: 150 ppm/°C Typical
• 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
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Resistance In Ohms: 10K
• End To End Resistance: 100kohm
• Track Taper: Linear
• Resistance Tolerance: ± 20%
• No. Of Steps: 256
• Supply Voltage Range: 2.7V To 5.5V
• Control Interface: I2C, Serial
• No. Of Pots: Dual
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.0
Non-volatile 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
devices can be used to replace the common mechani-
cal trim pot in applications where the operating and
terminal voltages are within CMOS process limitations
(V
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
pin is controlled by the PIC
IO2 pin.
When the SHDN pin is low, the TC1240A is on and the
V
HVC 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
© 2008 Microchip Technology Inc.
OUT
DD
PIC MCU
= 2.7V to 5.5V).
voltage is 2 * V
trimming.
APPLICATIONS EXAMPLES
Techniques to force the HVC pin
to V
IO1
IO2
IHH
Figure 8-1
IHH
The
voltage.
R
Using the TC1240A to
DD
1
SHDN
V
. The resistor R
TC1240A
IN
shows a method using the
MCP454X/456X/464X/466X
V
®
OUT
microcontrollers (MCUs)
C
C+
2
C-
HVC
MCP45XX
MCP46XX
1
DD
allows the
.
C
1
MCP454X/456X/464X/466X
The circuit in
MCP402X Non-volatile Digital Potentiometer Evalua-
tion 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 pin to change the stored value of the
wiper. The MCP402X Non-volatile Digital Potentiome-
ter Evaluation 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 pin (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 HVC pin
(when the system voltage is approximately 5V).
FIGURE 8-2:
Digital Potentiometer Evaluation Board
(MCP402XEV) implementation to generate the
V
IHH
PIC10F206
voltage.
GP0
GP2
Figure 8-2
C
1
MCP4XXX Non-Volatile
shows the method used on the
R
OH
1
) and configure the
DS22107A-page 67
C
2
HVC
MCP4XXX
IL
or V
IH
).