Description

Simple breakout board to convert logic-level signals to CAN bus. The MCP2562 is nothing but a fancy level shifter and must be used with a CAN bus controller, such as a Microchip MCP2515.

This board fits in a breadboard!

The left-side pins are the same as the CAN bus header on the LPCXpresso11C24 dev board.

Designed in EagleCAD.

Pins

Right side:

• TX: data out from CAN bus
• RX: data into CAN bus
• GND: ground (same as left side)
• +5V: powers chip (same as left side)
• VIO: interface voltage reference
• STBY: place the MCP2562 into low-power state

Left side:

• CANH: high-voltage side of CAN bus (usually 2.5-5V logic)
• CANL: low-voltage side of CAN bus (usually 0-2.5V logic)
• GND: ground (same as right side)
• +5V: transceiver power rail (same as right side)
• STBY: place the MCP2562 into low-power state

BOM

• U1: Microchip MCP2562SN
• C1, C2: 0.1µF 0603 ceramic capacitor
• R1: 120Ω 0603 resistor

Description

Simple breakout board for Honeywell’s MPR line of pressure sensors, which use a Wheatstone bridge and an optional 1nF filter capacitor.

This board has 0.5" pin row spacing such that it fits in a standard breadboard.

Designed in EagleCAD.

Pins

Right side:

• RST: reset, active-low
• EOC: end of conversion, data is available, active-high
• GND: ground
• +3.3V: VDD (note: device has no reverse-polarity protection and very little over-voltage protection)

Left side:

• MISO: master-in-slave-out for SPI
• SCL/SCK: clock input for SPI and I2C
• MOSI/SDA: data input for SPI, data I/O for I2C
• CS: chip select for SPI

BOM

• top footprint: any Honeywell MPR device
• 100nF: any 100nF 0603 capacitor
• 1nF: any 1nF 0603 capacitor

Edit: This board was not demonstrated to function properly. However, it closely follows the manufacturer’s reference schematics for both the evaluation board and datasheet examples. The current assumption is the chip isn’t being configured properly.

Original:

Demonstrating the use of the TI bq24251 chip in a VQFN-24 package. Designed using an Adafruit MCP73833 charger breakout board as a reference.

Charges any LiPo/Li-ion battery. Defaults to 1A max charge rate, but can be set up to 2A through I2C.

Contact [email protected] for a BOM and assembly guide.