PIC24F16KA102T-E datasheet(19/278 Pages) MICROCHIP

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DS39927C-page 19

PIC24F16KA102 FAMILY

2.4

Voltage Regulator Pin (VCAP)

Some of the PIC24F K devices have an internal voltage

regulator. These devices have the voltage regulator

output brought out on the VCAP pin. On the PIC24F K

devices with regulators, a low-ESR (< 5Ω) capacitor is

required on the VCAP pin to stabilize the voltage

regulator output. 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 specifications can be used.

Designers may use Figure 2-3 to evaluate ESR

equivalence of candidate devices.

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 29.0 “Electrical

Characteristics”

for additional information.

Refer to Section 29.0 “Electrical Characteristics” for

information on VDD and VDDCORE.

FIGURE 2-3:

FREQUENCY vs. ESR

PERFORMANCE FOR

SUGGESTED VCAP

Note:

This section applies only to PIC24F K

devices with an on-chip voltage regulator.

0.1

0.01

0.001

0.01

0.1

100

1000 10,000

Frequency (MHz)

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

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