Digilent Microchip PIC32MX795F512 32-bit MCU development solution

Microchip’s PIC32MX795F512 is a 32-bit flash memory MCU that integrates USB, CAN and Ethernet, 32-bit RISC CPU with a maximum frequency of 80MHz, MCU operating voltage of 2.3V-3.6V, with 64KB-512KB flash memory and 16KB to 128KB SRAM, while Digilent Corporation The Cerebot MX7cK MCU development board uses the PIC32MX795F512L, which is compatible with Pmod™ peripheral modules and is suitable for use with Microchip MPLAB® IDE tools, as well as with the chipKIT™ MPIDE development environment. This article first introduces the main features and block diagram of the PIC32MX795F512, followed by Introduce the main features and detailed circuit diagram of Cerebot MX7cK MCU development board.

The Cerebot MX7cK is a microcontroller development board based on the Microchip PIC32MX795F512L.

PIC32MX795F512 main features:

High-Performance 32-bit RISC CPU:

• MIPS32® M4K® 32-bit core with 5-stage pipeline
• 80 MHz maximum frequency
• 1.56 DMIPS/MHz (Dhrystone 2.1) performance at zero Wait state Flash access
• Single-cycle multiply and high-performance divide unit
• MIPS16e® mode for up to 40% smaller code size
• Two sets of 32 core register files (32-bit) to reduce interrupt latency
• Prefetch Cache module to speed execution from Flash

Microcontroller Features:

• Operating voltage range of 2.3V to 3.6V
• 64K to 512K Flash memory (plus an additional 12 KB of Boot Flash)
• 16K to 128K SRAM memory
• Pin-compatible with most PIC24/dsPIC® DSC devices
• Multiple power management modes
• Multiple interrupt vectors with individually programmable priority
• Fail-Safe Clock Monitor mode
• Configurable Watchdog Timer with on-chip
Low-Power RC oscillator for reliable operation

Peripheral Features:

• Atomic SET, CLEAR and INVERT operation on select peripheral registers
• Up to 8-channels of hardware DMA with automatic data size detection
• USB 2.0-compliant full-speed device and On-The-Go (OTG) controller:
– Dedicated DMA channels
• 10/100 Mbps Ethernet MAC with MII and RMII interface:
– Dedicated DMA channels
• CAN module:
– 2.0B Active with DeviceNet™ addressing support
– Dedicated DMA channels
• 3 MHz to 25 MHz crystal oscillator

Peripheral Features (Continued):

• Internal 8 MHz and 32 kHz oscillators
• Six UART modules with:
– RS-232, RS-485 and LIN support
– IrDA® with on-chip hardware encoder and decoder
• Up to four SPI modules
• Up to five I2C™ modules
• Separate PLLs for CPU and USB clocks
• Parallel Master and Slave Port (PMP/PSP) with 8-bit and 16-bit data, and up to 16 address lines
• Hardware Real-Time Clock and Calendar (RTCC)
• Five 16-bit Timers/Counters (two 16-bit pairs combine to create two 32-bit timers)
• Five Capture inputs
• Five Compare/PWM outputs
• Five external interrupt pins
• High-speed I/O pins capable of toggling at up to 80 MHz
• High-current sink/source (18 mA/18 mA) on all I/O pins
• Configurable open-drain output on digital I/O pins

Debug Features:

• Two programming and debugging Interfaces:
– 2-wire interface with unintrusive access and real-time data exchange with application
– 4-wire MIPS® standard enhanced Joint Test Action Group (JTAG) interface
• Unintrusive hardware-based instruction trace
• IEEE Standard 1149.2 compatible (JTAG) boundary scan

Analog Features:

• Up to 16-channel, 10-bit Analog-to-Digital Converter:
– 1 Msps conversion rate
– Conversion available during Sleep and Idle
• Two Analog Comparators

Figure 1. PIC32MX5XX/6XX/7XX Family Block Diagram

Cerebot MX7cK MCU Development Board

The Cerebot MX7cK is a microcontroller development board based on the Microchip PIC32MX795F512L, a member of the 32-bit PIC32 microcontroller family. It is compatible with Digilent’s line of Pmod™ peripheral modules, and is suitable for use with the Microchip MPLAB® IDE tools. The Cerebot MX7cK is also compatible for use with the chipKIT™ MPIDE development environment.

ChipKIT and MPIDE is a PIC32 based system compatible with many existing Arduino™ code examples, reference materials and other resources.

The Cerebot MX7cK is designed to be easy to use and suitable for use by anyone from beginners to advanced users for experimenting with embedded control and network communications application. A built in programming/debugging circuit compatible with the Microchip MPLAB® IDE is provided, so no additional hardware is required for use with MPLAB. The kit contains everything needed to start developing embedded applications using either the MPLAB® IDE or the MPIDE.

The Cerebot MX7cK provides 52 I/O pins that support a number of peripheral functions, such as UART, SPI and I2C™ ports as well as five pulse width modulated outputs and five external interrupt inputs. Its network and communications features also include a 10/ 100 Ethernet interface, Full Speed ​​USB 2.0 OTG interface, and dual CAN network interfaces.

Ten of the I/O pins can be used as analog inputs in addition to their use as digital inputs and outputs.

The Cerebot MX7cK can be powered in various ways via USB, or using an external AC-DC power adapter.

Main features of Cerebot MX7cK MCU development board:

a PIC32MX795F512L microcontroller

support for programming and debugging within the Microchip MPLAB development environment

six Pmod connectors for Digilent peripheral module boards

10/100 Ethernet

USB 2.0 Device, Host, and OTG support

two CAN network interfaces

three push buttons

four LEDs

multiple power supply options, including USB powered

ESD protection and short circuit protection for all I/O pins.

Figure 2. Cerebot MX7cK MCU development board outline drawing

Figure 3. Cerebot MX7cK MCU development board block diagram

Figure 4. Cerebot MX7cK MCU development board circuit diagram (1)

Figure 5. Cerebot MX7cK MCU development board circuit diagram (2)

Figure 6. Cerebot MX7cK MCU development board circuit diagram (3)

Figure 7. Cerebot MX7cK MCU development board circuit diagram (4)

Figure 8. Cerebot MX7cK MCU development board circuit diagram (5)

Figure 9. Cerebot MX7cK MCU development board circuit diagram (6)

Figure 10. Circuit diagram of Cerebot MX7cK MCU development board (7)

Figure 11. Circuit diagram of Cerebot MX7cK MCU development board (8)
For details, see:
http://ww1.microchip.com/downloads/en/DeviceDoc/61156G.pdf
and
http://www.digilentinc.com/Data/Products/CEREBOT-MX7CK/Cerebot_MX7cK_rm.pdf
as well as
http://www.digilentinc.com/Data/Products/CEREBOT-MX7CK/Cerebot%20MX7cK_sch.pdf