User manual

MCP2210 Evaluation Kit User’s Guide

A simple test using the SPI Terminal utility shows how the MCP23S08 (an 8-bit I/O

expander) uses the GP4 pin of the MCP2210 device as a chip select line. This line

should be active low. The GP4 must be set as in the Figure 2-1, with the IDLE option

checked (IDLE value is logic ‘1’) and the ACTIVE option unchecked (ACTIVE value is

logic ‘0’).

The SPI parameters are set as follows:

• Bit rate - 500000 bps

• SPI Mode – 0

• Number of bytes to transfer – 3

• All the SPI related delays are set to 0

The TX Data should contain the following HEX values: 40, 00, 00. Click on the SPI

Transfer Data button to complete the procedure and set the MCP23S08’s port as an

output.

After setting this port, a value can be sent out to the port to light the LEDs on the board.

To make this happen, insert the following three HEX values: 40, 0A, FF. By clicking the

SPI Transfer Data button again, the inserted values are sent out to the MCP23S08

device. This command will light all the LEDs on the board. If any other LED light pattern

is desired, the third value (FF) can be changed to any other 8-bit value.

To verify the value written to the MCP23S08’s port, another set of data must be written

into the TX Data area: 41, 0A and any other 8-bit value (a “Don’t care” value for the third

position is admissible, because the read value from the MCP23S08 is received on the

third byte).

In the RX Data field, the third value should be the identical to the one sent out previ-

ously (in the given example, FF).

2.3.4 MCP2210 Evaluation Kit demo application

The provided demo application is designed to work with the MCP2210 SPI Slave

Motherboard using the MCP2210 Breakout Board as a USB-to-SPI bridge.

The application’s source code is provided to facilitate the development of custom PC

applications using the MCP2210 and the accompanying DLL package. This application

was written in Visual Basic.