Datasheet

ManualsBrandsMicrochip ManualsEmbedded Processors & ControllersMicrocontroller

PIC32MX5XX/6XX/7XX

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 (V

CAP/VDDCORE)

2.3.1 INTERNAL REGULATOR MODE

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

VCAP/VDDCORE pin, which is used to stabilize the inter-

nal voltage regulator output. The V

CAP/VDDCORE pin

must not be connected to VDD, and must have a CEFC

capacitor, 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 C

EFC specifications.

2.4 Master Clear (MCLR) Pin

The MCLR pin provides for 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 (V

IH 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

PIC32MX

VDD

VSS

VDD

VSS

VDD

AVDD

AVSS

VDD

VSS

MCLR

0.1 µF

Ceramic

VCAP/VDDCORE

10 Ω

CBP

0.1 µF

Ceramic

0.1 µF

Ceramic

0.1 µF

Ceramic

0.1 µF

Ceramic

CEFC

Note 1: R ≤ 10 kΩ is recommended. A suggested

starting value is 10 kΩ. 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

IH 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 POR.

MCLR

PIC32MX