dsPIC33FJ16GP101/102 AND dsPIC33FJ16MC101/102
2.0
GUIDELINES FOR GETTING
2.2
Decoupling Capacitors
STARTED WITH 16-BIT
DIGITAL SIGNAL
CONTROLLERS
Note 1: This data sheet summarizes the features
of the dsPIC33FJ16GP101/102 and
dsPIC33FJ16MC101/102 family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to the “dsPIC33F/PIC24H
Family Reference Manual” . Please see
the Microchip web site
( www.microchip.com ) for the latest
dsPIC33F/PIC24H Family Reference
Manual sections.
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
this data sheet for device-specific register
and bit information.
The use of decoupling capacitors on every pair of
power supply pins, such as V DD , V SS , AV DD , and
AV SS is required.
Consider the following criteria when using decoupling
capacitors:
? Value and type of capacitor: Recommendation
of 0.1 μF (100 nF), 10V – 20V. This capacitor
should be a low-ESR and have resonance
frequency in the range of 20 MHz and higher. It is
recommended that ceramic capacitors be used.
? Placement on the printed circuit board: The
decoupling capacitors should be placed as close
to the pins as possible. It is recommended to
place the capacitors on the same side of the
board as the device. If space is constricted, the
capacitor can be placed on another layer on the
PCB using a via; however, ensure that the trace
length from the pin to the capacitor is within
one-quarter inch (6 mm) in length.
? Handling high frequency noise: If the board is
experiencing high frequency noise, upward of
tens of MHz, add a second ceramic-type capacitor
2.1
Basic Connection Requirements
in parallel to the above described decoupling
capacitor. The value of the second capacitor can
Getting started with the dsPIC33FJ16GP101/102 and
dsPIC33FJ16MC101/102 family of 16-bit Digital Signal
Controllers (DSCs) requires attention to a minimal set
of device pin connections before proceeding with
development. The following is a list of pin names, which
must always be connected:
? All V DD and V SS pins
? All AV DD and AV SS pins, if present on the device
(regardless if ADC module is not used)
? V CAP
? MCLR pin
? PGECx/PGEDx pins used for In-Circuit Serial
Programming? (ICSP?) and debugging purposes
? OSC1 and OSC2 pins when external oscillator
source is used
be in the range of 0.01 μF to 0.001 μF. Place this
second capacitor next to the primary decoupling
capacitor. In high-speed circuit designs, consider
implementing a decade pair of capacitances as
close to the power and ground pins as possible.
For example, 0.1 μF in parallel with 0.001 μF.
? Maximizing performance: On the board layout
from the power supply circuit, run the power and
return traces to the decoupling capacitors first,
and then to the device pins. This ensures that the
decoupling capacitors are first in the power chain.
Equally important is to keep the trace length
between the capacitor and the power pins to a
minimum thereby reducing PCB track inductance.
? 2011 Microchip Technology Inc.
Preliminary
DS70652C-page 21
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