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寤犲晢锛� Microchip Technology
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鏍稿績铏曠悊鍣細 PIC
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AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
I3-DB18F4680-ND - BOARD DAUGHTER ICEPIC3
444-1001-ND - DEMO BOARD FOR PICMICRO MCU
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2011 Microchip Technology Inc.
DS39931D-page 31
PIC18F46J50 FAMILY
2.4
Voltage Regulator Pins
(VCAP/VDDCORE)
On 鈥淔鈥� devices, a low-ESR (< 5) capacitor is required
on the VCAP/VDDCORE pin to stabilize the voltage
regulator output voltage. The VCAP/VDDCORE pin must
not be connected to VDD or any other voltage source on
an 鈥淔鈥� device. The VCAP/VDDCORE pin should only be
connected to a 10 F capacitor to ground. The type can
be ceramic or tantalum. Suitable example capacitors
are provided in Table 2-1.
Designers may use Figure 2-3 to evaluate ESR
equivalence of candidate devices. It is recommended
that the trace length not exceed 0.25 inch (6 mm).
additional information.
On 鈥淟F鈥� devices, the internal core voltage regulator is
disabled. On these devices, the VCAP/VDDCORE pin
must be externally connected to a suitable VDDCORE
level voltage source at the circuit board level. Refer to
for the
allowed VDDCORE voltage range. Good power supply
bypassing practices should be used for the supply
source providing the VCAP/VDDCORE voltage.
It is recommended to use a 0.1 F ceramic capacitor
between VCAP/VDDCORE and ground, placed as close
to the VCAP/VDDCORE and VSS pins as possible.
FIGURE 2-3:
FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED VCAP
.
10
1
0.1
0.01
0.001
0.01
0.1
1
10
100
1000 10,000
Frequency (MHz)
ESR
(
)
Note:
Typical data measurement at 25掳C, 0V DC bias.
TABLE 2-1:
SUITABLE CAPACITOR EQUIVALENTS
Make
Part #
Nominal
Capacitance
Base Tolerance
Rated Voltage
Temp. Range
TDK
C3216X7R1C106K
10 F
卤10%
16V
-55 to +125C
TDK
C3216X5R1C106K
10 F
卤10%
16V
-55 to +85C
Panasonic
ECJ-3YX1C106K
10 F
卤10%
16V
-55 to +125C
Panasonic
ECJ-4YB1C106K
10 F
卤10%
16V
-55 to +85C
Murata
GRM32DR71C106KA01L
10 F
卤10%
16V
-55 to +125C
Murata
GRM31CR61C106KC31L
10 F
卤10%
16V
-55 to +85C
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