Sensors

2

Freescale Semiconductor

MMA690xQ

SECTION 1 INTRODUCTION

1.1

INTRODUCTION

MMA690xQ is a two-axis member of Freescale’s family of SPI-compatible accelerometers. These devices incorporate digital

signal processing for filtering, trim, and data formatting.

1.2

SERIAL COMMUNICATION CONFIGURATION

The serial communication configuration provides a 4-wire SPI interface. Device serial number, acceleration range, filter char-

acteristics, and status information are available along with acceleration data via the SPI.

1.3

BLOCK DIAGRAM

A block diagram illustrating the major components of the design is shown in Figure 1-1.

Figure 1-1 Block Diagram

SPI

SCLK

CS

SELF-TEST

PCM_X

INTERFACE

TEMP.

SENSOR

ΣΔ

CONVERTER

VOLTAGE

REGULATOR

g-CELL

(Y)

g-CELL

(X)

CONTROL

LOGIC

UNIT

DATA ARRAY

PROGRAMMABLE

ΣΔ

CONVERTER

CLOCK

INTERNAL

MONITOR

CAP/HOLD

PCM

PCM_Y

IN 1

IN 0

DIGITAL

Y OUT

X OUT

DSP

TEMP

OUT

CONTROL

IN

STATUS

OUT

PCM

CLOCK

PRIMARY

OSCILLATOR

REFERENCE

OSCILLATOR

SINC

FILTER

SINC

FILTER