MCP4021T-502E/SN Microchip Technology, MCP4021T-502E/SN Datasheet - Page 39

• Manufacturer Part Number: MCP4021T-502E/SN
• Description: IC DGTL POT 5K 1CH 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP4021T-502E/SN

• Memory Type: Non-Volatile
• Taps: 64
• Resistance (ohms): 5K
• Number Of Circuits: 1
• Temperature Coefficient: 150 ppm/°C Typical
• Interface: Up/Down
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Resistance In Ohms: 5K
• End To End Resistance: 5kohm
• Resistance Tolerance: ± 20%
• No. Of Steps: 64
• Supply Voltage Range: 2.7V To 5.5V
• Control Interface: 2 Wire, Serial
• No. Of Pots: Single
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP4XXXDM-DB - BOARD DAUGHTER DIGIPOT MCP4XXXMCP402XEV - BOARD EVAL FOR MCP402X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

5.3
Depending on the requirements of the system, the use
of high voltage (V
required during system operation. Table 5-2 shows
possible system applications, and whether a high
voltage (V
The MCP402X supports six high-voltage commands
(the CS input voltage must meet the V
tion).
TABLE 5-2:
5.3.1
The circuit in Figure 5-12 shows a method using the
TC1240A doubling charge pump. When the SHDN pin
is high, the TC1240A is off, and the level on the CS pin
is controlled by the PICmicro® microcontrollers
(MCUs) IO2 pin.
When the SHDN pin is low, the TC1240A is on and the
V
pin to go higher than the voltage such that the PICmicro
MCU’s IO2 pin “clamps” at approximately V
FIGURE 5-12:
generate the V
© 2005 Microchip Technology Inc.
Production calibration only - system
should not update wiper setting
WiperLock™ Technogy disabled during
system operation
Wiper setting can be updated and
“locked” during system operation
OUT
PICmicro
MCU
voltage is 2 * V
CS High Voltage
IO1
IO2
IHH
System Operation
TECHNIQUES TO FORCE THE CS
PIN TO V
) is required on the system.
IHH
IHH
HIGH-VOLTAGE
APPLICATIONS
) on the CS pin, may or may not be
voltage.
DD
R
IHH
Using the TC1240A to
. The resistor R
1
SHDN
V
TC1240A
IN
V
OUT
C
C+
2
C-
CS
1
allows the CS
IHH
MCP402X
Calibration
Required
Required
DD
Voltage
specifica-
From
High
Unit
.
Not
C
1
The circuit in Figure 5-13 shows the method used on
the MCP402X Non-volatile Digital Potentiometer Eval-
uation Board. This method requires that the system
voltage be approximately 5V. This ensures that when
the PIC10F206 enters a brown-out condition, there is
an insufficent voltage level on the CS pin to change the
stored value of the wiper. The MCP402X Non-volatile
Digital Potentiometer 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 impedence). The output state of the GP0 pin
will determine the voltage on the CS pin (V
For high-voltage serial commands, force the GP0 out-
put 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 5-13:
Digital Potentiometer Evaluation Board
(MCP402XEV) implementation to generate the
V
IHH
PIC10F206
voltage.
GP0
GP2
MCP4021/2/3/4
C
1
MCP402X Non-volatile
R
OH
1
) and configure the
DS21945C-page 39
C
2
CS
MCP402X
IL
or V
IH
).