Microchip Technology MA240017 数据表
2008-2011 Microchip Technology Inc.
DS39927C-page 19
PIC24F16KA102 FAMILY
2.4
Voltage Regulator Pin (V
CAP
)
Some of the PIC24F K devices have an internal voltage
regulator. These devices have the voltage regulator
output brought out on the V
regulator. These devices have the voltage regulator
output brought out on the V
CAP
pin. On the PIC24F K
devices with regulators, a low-ESR (< 5Ω) capacitor is
required on the V
required on the V
CAP
pin to stabilize the voltage
regulator output. The V
CAP
pin must not be connected to
V
DD
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
examples of capacitors are shown in
.
Capacitors with equivalent specifications can be used.
Designers may use
Designers may use
to evaluate ESR
equivalence of candidate devices.
The placement of this capacitor should be close to V
The placement of this capacitor should be close to V
CAP
.
It is recommended that the trace length not exceed
0.25 inch (6 mm). Refer to
0.25 inch (6 mm). Refer to
for additional information.
Refer to
for
information on V
DD
and V
DDCORE
.
FIGURE 2-3:
FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED V
PERFORMANCE FOR
SUGGESTED V
CAP
Note:
This section applies only to PIC24F K
devices with an on-chip voltage regulator.
devices with an on-chip voltage regulator.
10
1
0.1
0.01
0.001
0.01
0.1
1
10
100
1000 10,000
Frequency (MHz)
ES
R (
)
Note:
Typical data measurement at 25°C, 0V DC bias.
TABLE 2-1:
SUITABLE CAPACITOR EQUIVALENTS
Make
Part #
Nominal
Capacitance
Base Tolerance
Rated Voltage
Temp. Range
TDK
C3216X7R1C106K
10 µF
±10%
16V
-55 to 125ºC
TDK
C3216X5R1C106K
10 µF
±10%
16V
-55 to 85ºC
Panasonic
ECJ-3YX1C106K
10 µF
±10%
16V
-55 to 125ºC
Panasonic
ECJ-4YB1C106K
10 µF
±10%
16V
-55 to 85ºC
Murata
GRM32DR71C106KA01L
10 µF
±10%
16V
-55 to 125ºC
Murata
GRM31CR61C106KC31L
10 µF
±10%
16V
-55 to 85ºC