PIC24FJ128GA310-I Datasheet, PDF (31/406 Pages) Microchip Technology – 64/80/100-Pin, General Purpose, 16-Bit Flash Microcontrollers with LCD Controller and nanoWatt XLP Technology

PIC24FJ128GA310 FAMILY
2.4 Voltage Regulator Pin (VCAP)
A low-ESR (< 5Ω) capacitor is required on the VCAP pin
to stabilize the output voltage of the on-chip voltage
regulator . The VCAP pin must not be connected to VDD
and must use a capacitor of 10 µF connected to ground.
The type can be ceramic or tantalum. Suitable examples
of capacitors are shown in Table 2-1. Capacitors with
equivalent specification can be used.
The placement of this capacitor should be close to
VCAP. It is recommended that the trace length not
exceed 0.25 inch (6 mm). Refer to Section 32.0
“Electrical Characteristics” for additional
information.
Designers may use Figure 2-3 to evaluate ESR
equivalence of candidate devices.
Refer to Section 29.2 “On-Chip Voltage Regulator”
for details on connecting and using the on-chip
regulator.
FIGURE 2-3:
10
1
FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED VCAP
0.1
0.01
0.001
0.01
0.1
1
10
100
Frequency (MHz)
1000 10,000
Note:
Typical data measurement at 25°C, 0V DC bias.
TABLE 2-1:
Make
TDK
TDK
Panasonic
Panasonic
Murata
Murata
.
SUITABLE CAPACITOR EQUIVALENTS
Part #
Nominal
Capacitance
Base Tolerance Rated Voltage Temp. Range
C3216X7R1C106K
C3216X5R1C106K
ECJ-3YX1C106K
ECJ-4YB1C106K
GRM32DR71C106KA01L
GRM31CR61C106KC31L
10 µF
10 µF
10 µF
10 µF
10 µF
10 µF
±10%
±10%
±10%
±10%
±10%
±10%
16V
-55 to 125ºC
16V
-55 to 85ºC
16V
-55 to 125ºC
16V
-55 to 85ºC
16V
-55 to 125ºC
16V
-55 to 85ºC
 2010-2011 Microchip Technology Inc.
DS39996F-page 31