DSPIC33EV64GM102-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

DSPIC33EV64GM102-I/SO

16-Bit, 5V Digital Signal Controllers with PWM, SENT, Op Amps and Advanced Analog Features

Microchip Technology 

dsPIC33EVXXXGM00X/10X FAMILY

FIGURE 2-1:

RECOMMENDED

MINIMUM CONNECTION

VDD

10 µF

Tantalum

R

R1

MCLR

C

dsPIC33EV

VSS

0.1 µF

VDD

Ceramic

0.1 µF

Ceramic

VDD

VSS

0.1 µF

Ceramic

L1(1)

0.1 µF

Ceramic

0.1 µF

Ceramic

Note 1:

As an option, instead of a hard-wired connection, an

inductor (L1) can be substituted between VDD and

AVDD to improve ADC noise rejection. The inductor

impedance should be less than 1 and the inductor

capacity greater than 10 mA.

Where:

f = -F----C---N----V-

2

(i.e., ADC Conversion Rate/2)

f = -----------1------------

2 LC

L

=





---2-------f1------C-----

2

2.2.1 TANK CAPACITORS

On boards with power traces running longer than six

inches in length, it is suggested to use a tank capacitor

for integrated circuits including DSCs to supply a local

power source. The value of the tank capacitor should

be determined based on the trace resistance that

connects the power supply source to the device, and

the maximum current drawn by the device in the appli-

cation. In other words, select the tank capacitor so that

it meets the acceptable voltage sag at the device.

Typical values range from 4.7 µF to 47 µF.

2.3 CPU Logic Filter Capacitor

Connection (VCAP)

A low-ESR (<1 Ohms) capacitor is required on the VCAP

pin, which is used to stabilize the internal voltage regulator

output. The VCAP pin must not be connected to VDD, and

must have a capacitor greater than 4.7 µF (10 µF is

recommended), with at least a 16V rating connected to

the ground. The type can be ceramic or tantalum. See

Section 30.0 “Electrical Characteristics” for additional

information.

The placement of this capacitor should be close to the

VCAP pin. It is recommended that the trace length

should not exceed one-quarter inch (6 mm).

2.4 Master Clear (MCLR) Pin

The MCLR pin provides two specific device

functions:

• Device Reset

• Device Programming and Debugging

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 shown in Figure 2-1, it is

recommended that the capacitor, C, be isolated from

the MCLR pin during programming and debugging

operations.

Place the components as shown in Figure 2-2 within

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

FIGURE 2-2:

EXAMPLE OF MCLR PIN

CONNECTIONS

VDD

R(1)

R1(2)

MCLR

JP

dsPIC33EV

C

Note 1:

2:

R  10 k is recommended. A suggested

starting value is 10 k. Ensure that the MCLR

pin VIH and VIL specifications are met.

R1  470 will limit any current flow into

MCLR from the external capacitor, C, in the

event of MCLR pin breakdown due to Electro-

static Discharge (ESD) or Electrical

Overstress (EOS). Ensure that the MCLR pin

VIH and VIL specifications are met.

DS70005144E-page 18

 2013-2016 Microchip Technology Inc.

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