PIC32MZ datasheet(16/30 Pages) MICROCHIP

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PIC32MZ EF Family Starter Kit User’s Guide

DS70005230A-page 16

 2015 Microchip Technology Inc.

2.1.4

PIC32 USB Connectivity

There are three possible ways to connect to the PIC32 USB microcontroller:

• HOST Mode – Connect the device to the Type A connector J5, which is located on

the top side of the starter kit. Note that a maximum of ~400 mA can be supplied

from the Debug USB port to the Host port using this method. If the full 500 mA

supply is needed, an external supply must be connected to the application board.

• DEVICE Mode – Connect the debug mini-B USB cable to port J3, and then

connect the starter kit to the host using a cable with a Type-B micro-connector to

the starter kit’s micro-A/B port J4, which is located on the bottom side of the

board. The other end of the cable must have a Type-A connector. Connect it to a

USB host.

• OTG Mode – Connect the starter kit to the OTG device using an OTG micro-A/B

cable to the micro-A/B port J4, which is located on the bottom side of the board.

The starter kit provides an on-board power supply capable of providing 120 mA

Max. This supply is controlled by the PIC32MZ2048EFH144 device.

2.1.5

Switches

Push button switches provide the following functionality:

• SW1: Active-low switch connected to RB12

• SW2: Active-low switch connected to RB13

• SW3: Active-low switch connected to RB14

The switches do not have any debounce circuitry and require the use of internal pull-up

resistors; this allows you to investigate software debounce techniques. When Idle, the

switches are pulled high (+3.3V), and when pressed, they are grounded.

2.1.6

LEDs

The RH0 through RH2 LEDs are connected to PORTH of the processor. The LATH pins

are set high to light the LEDs.

2.1.7

Oscillator Options

A 24 MHz oscillator circuit (Y4) is connected to the on-board microcontroller. This

oscillator circuit functions as the controller’s primary oscillator. Depending on which is

populated on the starter kit board, a 24 MHz crystal (Y1) may be used instead of Y4.

Use of an external crystal is required to develop USB applications. The USB specification

dictates a frequency tolerance of ±0.25% for high speed. Non-USB applications can use

the internal oscillators.

The starter kit also has provisions for an external secondary 32 kHz oscillator (Y2);

however, this is not populated. A suitable oscillator, the ECS-3X8, can be obtained from

Digi-Key: P/N - X801-ND CMR200TB32.768KDZFTR.

The PIC24FJ256GB106 is independently clocked and has its own 12 MHz crystal.

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