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PIC18 J Series MCU Overview
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MA180020-ND - MODULE PLUG-IN HPC EXPL 18F87J11
AC164327-ND - MODULE SKT FOR 64TQFP
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2007-2012 Microchip Technology Inc.
DS39778E-page 33
PIC18F87J11 FAMILY
2.4
Voltage Regulator Pins (ENVREG
and VCAP/VDDCORE)
The on-chip voltage regulator enable pin, ENVREG,
must always be connected directly to either a supply
voltage or to ground. Tying ENVREG to VDD enables
the regulator, while tying it to ground disables the
for details on connecting and using the
on-chip regulator.
When the regulator is enabled, 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 and
must use a capacitor of 10 F connected to ground. The
type can be ceramic or tantalum. Suitable examples of
capacitors are shown in Table 2-1. Capacitors with
equivalent specifications can be used.
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). Refer to Section 28.0 鈥淓lectrical
for additional information.
When the regulator is disabled, the VCAP/VDDCORE pin
must be tied to a voltage supply at the VDDCORE level.
information on VDD and VDDCORE.
Note that the 鈥淟F鈥� versions of some low pin count
PIC18FJ parts (e.g., the PIC18LF45J10) do not have
the ENVREG pin. These devices are provided with the
voltage regulator permanently disabled; they must
always be provided with a supply voltage on the
VDDCORE pin.
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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