PIC24FJ64GA006 datasheet(21/258 Pages) MICROCHIP

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 2005-2012 Microchip Technology Inc.

DS39747F-page 21

PIC24FJ128GA010 FAMILY

2.4

Voltage Regulator Pins

(ENVREG/DISVREG and

VCAP/VDDCORE)

The on-chip voltage regulator enable/disable pin

(ENVREG or DISVREG, depending on the device

family) must always be connected directly to either a

supply voltage or to ground. The particular connection

is determined by whether or not the regulator is to be

used:

• For ENVREG, tie to VDD to enable the regulator,

or to ground to disable the regulator

• For DISVREG, tie to ground to enable the

regulator or to VDD to disable the regulator

Refer to Section 24.2 “On-Chip Voltage Regulator”

for details on connecting and using the on-chip

regulator.

When the regulator is enabled, a low-ESR (< 5Ω)

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 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.

Designers may use Figure 2-3 to evaluate ESR

equivalence of candidate devices.

The placement of this capacitor should be close to

VCAP/VDDCORE. It is recommended that the trace

length not exceed 0.25 inch (6 mm). Refer to

Section 27.0

“Electrical

Characteristics”

for

additional information.

When the regulator is disabled, the VCAP/VDDCORE pin

must be tied to a voltage supply at the VDDCORE level.

Refer to Section 27.0 “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 J

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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