pic32mx320f032h Microchip Technology Inc., pic32mx320f032h Datasheet - Page 17

• Manufacturer Part Number: pic32mx320f032h
• Description: 64/100-pin General Purpose And Usb 32-bit Flash Microcontrollers
• Manufacturer: Microchip Technology Inc.

2.0
2.1
Getting started with the PIC32MX3XX/4XX family of
32-bit Microcontrollers (MCU) 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)
is not used)
(see Section 2.2)
(see Section 2.3)
(see Section 2.4)
Programming™ (ICSP™) and debugging purposes
(see Section 2.5)
source is used
(see Section 2.8)
reference for ADC module is implemented
Note:
REF
CAP
DD
+/V
/V
DD
GUIDELINES FOR GETTING
STARTED WITH 32-BIT
MICROCONTROLLERS
Basic Connection Requirements
DDCORE
and V
REF
and AV
reference source. Refer to the “PIC32MX
description of the PIC32MX MCU.
This data sheet summarizes the features of
the PIC32MX3XX/4XX family of devices. It
is not intended to be a comprehensive
Family Reference Manual” for a detailed
The manual is available from the Microchip
web site (www.Microchip.com/PIC32).
The AV
connected independent of ADC use and
ADC voltage reference source.
- pins used when external voltage
SS
SS
pins
DD
pins (regardless if ADC module
and AV
SS
pins must be
Preliminary
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. See Figure 2-1.
PIC32MX3XX/4XX
Decoupling Capacitors
DD
, V
DS61143F-page 15
SS
, AV
DD
, and