PIC32MX795F512LT-80ISLASHPF datasheet(44/256 Pages) MICROCHIP

44 / 256 page

PIC32MX5XX/6XX/7XX

DS61156G-page 44

FIGURE 2-1:

RECOMMENDED

MINIMUM CONNECTION

2.2.1

BULK CAPACITORS

The use of a bulk capacitor is recommended to improve

power supply stability. Typical values range from 4.7 µF

to 47 µF. This capacitor should be located as close to

the device as possible.

2.3

Capacitor on Internal Voltage

Regulator (VCAP/VCORE)

2.3.1

INTERNAL REGULATOR MODE

A low-ESR (1 ohm) capacitor is required on the

VCAP/VCORE pin, which is used to stabilize the internal

voltage regulator output. The VCAP/VCORE pin must not

be connected to VDD, and must have a CEFC capaci-

tor, with at least a 6V rating, connected to ground. The

type can be ceramic or tantalum. Refer to Section 31.0

“Electrical Characteristics” for additional information

on CEFC specifications.

2.4

Master Clear (MCLR) Pin

The MCLR pin provides two specific device

functions:

• Device Reset

• Device Programming and Debugging

Pulling The MCLR pin low generates a device Reset.

Figure 2-2 illustrates a typical MCLR circuit. During

device programming and debugging, the resistance

and capacitance that can be added to the pin must

be considered. Device programmers and debuggers

drive the MCLR pin. Consequently, specific voltage

levels (VIH and VIL) and fast signal transitions must

not be adversely affected. Therefore, specific values

of R and C will need to be adjusted based on the

application and PCB requirements.

For example, as illustrated in Figure 2-2, it is

recommended that the capacitor C, be isolated from

the MCLR pin during programming and debugging

operations.

Place the components illustrated in Figure 2-2 within

one-quarter inch (6 mm) from the MCLR pin.

FIGURE 2-2:

EXAMPLE OF MCLR PIN

CONNECTIONS

PIC32

VDD

VSS

VDD

MCLR

0.1 µF

Ceramic

CBP

0.1 µF

Ceramic

CBP

0.1 µF

Ceramic

CBP

0.1 µF

Ceramic

CBP

0.1 µF

Ceramic

CBP

CEFC

Note 1: R

≤10 kΩ is recommended. A suggested start-

ing value is 10 k

Ω. Ensure that the MCLR pin

VIH and VIL specifications are met.

2: R1

≤ 470Ω will limit any current flowing into

MCLR from the external capacitor C, in the

event of MCLR pin breakdown, due to

Electrostatic Discharge (ESD) or Electrical

Overstress (EOS). Ensure that the MCLR pin

VIH and VIL specifications are met.

3: The capacitor can be sized to prevent uninten-

tional Resets from brief glitches or to extend

the device Reset period during the POR.

VDD

MCLR

PIC32

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