FMT1000 datasheet(7/29 Pages) FAIRCHILD

Part #	FMT1000

Description	Motion Tracking Module with Output of Orientation, Inertial Motion Data and Magnetic Field

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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FMT1000-series

• Rev. 1.0

7

1.7

Peripheral Interface Selection

The FMT1000-series modules are designed to be used

as a peripheral device in embedded systems. The

module

supports

Universal

Asynchronous

Receiver/Transmitter (UART), inter-integrated circuit

(I

2C) and the Serial Peripheral Interface (SPI) protocols.

The

I

2C and SPI protocols are well suited for

communications between integrated circuits with on-

board peripherals. The FMT1000-series modules have

four modes of peripheral interfacing. Only one mode can

be used at a time and is determined by the state of

peripheral selection pins PSEL0 and PSEL1 at startup.

Table 1 specifies how the PSEL lines select the

peripheral interface. Note that the module has internal

pull-ups. Not connecting PSEL results in a value of 1,

connecting PSEL to a GND results in a value of 0.

Examples for communication on embedded systems are

available at https://developer.mbed.org/teams/Fairchild-

Semiconductor

Table 1.

Peripheral Interface Selection

Interface

PSEL0

PSEL1

I

2C

1

SPI

0

1

UART Half-Duplex

1

0

UART Full-Duplex

0

1.7.1

Peripheral Interface Architecture

At its core the module uses the proprietary Xbus

protocol. This protocol is available on all interfaces,

UART (asynchronous serial port interfaces) and I

2C and

SPI buses. The I

2C and SPI buses differ from UART in

that they are synchronous and have a master-slave

relation in which the slave cannot send data by itself.

This makes the Xbus protocol not directly transferable to

these buses. For this the MTSSP protocol is introduced

that provides a way to exchange standard Xbus protocol

messages over the I

2C and SPI buses.

Figure 5 shows how MTSSP is fitted in the module's

(simplified) communication architecture. The module

has generic Input- and Output-Queues for Xbus protocol

messages. For I

2C and SPI these messages are

translated

by

the

MTSSP

layer.

For

the

UART

connection these messages are transported as-is.

Figure 5.

FMT Module Architecture

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