dspic33fj128gp204 Microchip Technology Inc., dspic33fj128gp204 Datasheet - Page 21

• Manufacturer Part Number: dspic33fj128gp204
• Description: High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

2.0
2.1
Getting started with the dsPIC33FJ32GP302/304,
dsPIC33FJ64GPX02/X04
dsPIC33FJ128GPX02/X04 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
• All AV
• V
• MCLR pin
• PGECx/PGEDx pins used for In-Circuit Serial
• OSC1 and OSC2 pins when external oscillator
Additionally, the following pins may be required:
• V
© 2009 Microchip Technology Inc.
Note:
(see Section 2.2 “Decoupling Capacitors”)
is not used)
(see Section 2.2 “Decoupling Capacitors”)
(see Section 2.3 “Capacitor on Internal Voltage
Regulator (V
(see Section 2.4 “Master Clear (MCLR) Pin”)
Programming™ (ICSP™) and debugging purposes
(see Section 2.5 “ICSP Pins”)
source is used
(see Section 2.6 “External Oscillator Pins”)
reference for ADC module is implemented
Note:
CAP
REF
DD
+/V
/V
DD
GUIDELINES FOR GETTING
STARTED WITH 16-BIT
DIGITAL SIGNAL
CONTROLLERS
Basic Connection Requirements
DDCORE
and V
REF
and AV
This data sheet summarizes the features
of
dsPIC33FJ64GPX02/X04
dsPIC33FJ128GPX02/X04
devices. It is not intended to be a
comprehensive
complement the information in this data
sheet, refer to the “dsPIC33F Family
Reference Manual”, which is available
from
(www.microchip.com).
The AV
connected independent of the ADC
voltage reference source.
- pins used when external voltage
CAP
SS
SS
pins
the
/V
DD
DDCORE
pins (regardless if ADC module
the
and AV
dsPIC33FJ32GP302/304,
reference
)”)
Microchip
SS
pins must be
source.
family
website
and
and
Preliminary
To
of
2.2
The use of decoupling capacitors on every pair of
power supply pins, such as V
AV
Consider the following criteria when using decoupling
capacitors:
• Value and type of capacitor: Recommendation
• Placement on the printed circuit board: The
• Handling high frequency noise: If the board is
• Maximizing performance: On the board layout
of 0.1 µF (100 nF), 10-20V. 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.
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.
experiencing high frequency noise, upward of
tens of MHz, add a second ceramic-type capacitor
in parallel to the above described decoupling
capacitor. The value of the second capacitor can
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.
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.
SS
is required.
Decoupling Capacitors
DD
, V
DS70292C-page 19
SS
, AV
DD
and