Alternative Installation Options - Kauai Labs navX-MXP User Manual

Robotics navigation sensor

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Table Of Contents

Table of Contents

Installation

I/O Expansion

navX-MXP Port

I2C

The nav-MXP I2C connector can be used to connect the RoboRIO to an external I2C Device.

The RoboRIO functions as an I2C Master. The connector provides DC Voltage, Ground, Clock

(SCL) and Data (SDA).

Note that this I2C connector resides on the same I2C bus which may optionally be used to

communicate between the RoboRIO and the navX-MXP's onboard processor. navX-MXP uses

I2C Address 50 (0x32), so be sure that any external I2C device does not use this address.

SPI

The navX MXP SPI connector can be used to connect the RoboRIO to an external SPI device.

The RoboRIO functions as an SPI Master. The connector provides DC Votage, Ground, Clock

(SCK), Slave Select (SS), Master-in/Slave-out (MISO) and Master-out/Slave-in (MOSI) signals.

Note that this SPI connector resides on the same SPI bus which may optionally be used to

communicate between the RoboRIO and the navX-MXP's onboard processor. navX-MXP will

respond to the Slave Select signal if and only if the SPI Enable dip switch is set to the "ON"

position. Thus, the SPI Enable dip switch should be set to the "OFF" position if you wish to

communicate with an external device via the SPI connector.

TTL UART

The navX-MXP TTL UART connector can be used to connect the RoboRIO to an external TTL-

level UART device.

NOTE: The TTL UART connector cannot be used to connect to an external RS-232 signal,

since RS-232 voltages are much higher than TTL-level UART voltages. Connecting a higher-

voltage RS-232 device to the TTL UART connector may subject the RoboRIO to damaging

voltage levels on these pins.

Note that this TTL UART connector can be used to communicate between the RoboRIO and the

navX-MXP's onboard processor (in fact, this is the default). navX-MXP will respond to the

UART TX signal from the RoboRIO if and only if the UART Enable dip switch is set to the "ON"

position. Thus, the UART Enable dip switch should be set to the "OFF" position if you wish to

communicate with an external device via the TTL UART connector.

MXP Pin Number

AO0

AO1