IAM-20381 pdf, IAM-20381 데이터시트, IAM-20381 데이타시트

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IAM-20381

High Performance 3-Axis MotionTracking Accelerometer

GENERAL DESCRIPTION

The IAM-20381 is a 3-axis MotionTracking accelerometer

for Automotive applications in a small 3x3x0.75 mm (16-

pin LGA) package. It also features a 512-byte FIFO that

can lower the traffic on the serial bus interface and

reduce power consumption by allowing the system

processor to burst read sensor data and then go into a

low-power mode. IAM-20381, with its 3-axis integration,

enables manufacturers to eliminate the costly and

complex selection, qualification, and system level

integration of discrete devices, guaranteeing optimal

motion performance.

The accelerometer has a user-programmable

accelerometer full-scale range of ±2g, ±4g, ±8g, and

±16g. Factory-calibrated initial sensitivity of both sensors

reduces production-line calibration requirements.

Other industry-leading features include on-chip 16-bit

ADCs, programmable digital filters, an embedded

temperature sensor, and programmable interrupts. The

device features I2C and SPI serial interfaces, a VDD

operating range of 1.71V to 3.6V, and a separate digital

IO supply, VDDIO from 1.71V to 3.6V.

BLOCK DIAGRAM

Self

test

X Accel

Self Y Accel

test

Self

test

Z Accel

ADC

Temp Sensor

ADC

IAM-20381

Interrupt

Status

FIFO

User & Config

Registers

Sensor

Registers

Slave I2C and

SPI Serial

Interface

INT

SA0 / SDO

SCL / SPC

SDA / SDI

FSYNC

Bias & LDOs

VDD

GND REGOUT

APPLICATIONS

• Navigation Systems Aids for Dead Reckoning

• Lift Gate Motion Detections

• Accurate Location for Vehicle to Vehicle and

Infrastructure

• 360º View Camera Stabilization

• Car Alarm

• Telematics

• Insurance Vehicle Tracking

ORDERING INFORMATION

PART

IAM-20381†

AXES TEMP RANGE

X,Y,Z -40°C to +85°C

PACKAGE

16-Pin LGA

MSL*

†Denotes RoHS and Green-compliant package

* Moisture sensitivity level of the package

FEATURES

• Digital-output X-, Y-, and Z-axis accelerometer

with a programmable full scale range of ±2g,

±4g, ±8g, and ±16g and integrated 16-bit ADCs

• User-programmable digital filters for

accelerometer, and temperature sensor

• Self-test

• Wake-on-motion interrupt for low power

operation of applications processor

• Reliability testing performed per

AEC–Q100

o PPAP and qualification data available

upon request

TYPICAL OPERATING CIRCUIT

1.8 – 3.3VDC

C2, 0.1 µF

VDD

C4, 2.2 µF

REGOUT

16 15 14

1.8 – 3.3 VDC

C3, 10 nF

VDDIO

SCL SCL/SPC 2

SDA SDA/SDI 3

AD0 SA0/SDO 4

CS 5

IAM-20381

GND

RESV

11 RESV

10 RESV

9 RESV

678

C1, 0.47 µF

InvenSense reserves the right to change the detail

specifications as may be required to permit

improvements in the design of its products.

TDK Corporation

1745 Technology Drive, San Jose, CA 95110 U.S.A

+1(408) 988–7339

www.invensense.com

Document Number: DS-000216

Revision: 1.0

Rev. Date: 03/29/2017

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IAM-20381

TABLE OF CONTENTS

General Description .............................................................................................................................................1

Block Diagram ......................................................................................................................................................1

Applications .........................................................................................................................................................1

Ordering Information...........................................................................................................................................1

Features ...............................................................................................................................................................1

Typical Operating Circuit......................................................................................................................................1

TABLE OF CONTENTS....................................................................................................................................................... 2

LIST OF FIGURES.............................................................................................................................................................. 4

LIST OF TABLES................................................................................................................................................................ 5

1 Introduction ......................................................................................................................................................... 6

Purpose and Scope....................................................................................................................................6

Product Overview......................................................................................................................................6

Applications............................................................................................................................................... 6

2 Features ............................................................................................................................................................... 7

Accelerometer Features............................................................................................................................7

Additional Features ...................................................................................................................................7

3 Electrical Characteristics ...................................................................................................................................... 8

Accelerometer Specifications....................................................................................................................8

Electrical Specifications.............................................................................................................................9

I2C Timing Characterization.....................................................................................................................12

SPI Timing Characterization ....................................................................................................................13

Absolute Maximum Ratings ....................................................................................................................14

4 Applications Information ................................................................................................................................... 15

Pin Out Diagram and Signal Description .................................................................................................15

Typical Operating Circuit.........................................................................................................................16

Bill of Materials for External Components ..............................................................................................16

Block Diagram .........................................................................................................................................17

Overview .................................................................................................................................................17

Three-Axis MEMS Accelerometer with 16-bit ADCs and Signal Conditioning.........................................18

I2C and SPI Serial Communications Interfaces ........................................................................................18

Self-Test................................................................................................................................................... 19

Clocking ...................................................................................................................................................19

Sensor Data Registers .........................................................................................................................19

FIFO ..................................................................................................................................................... 20

Interrupts ............................................................................................................................................ 20

Digital-Output Temperature Sensor ...................................................................................................20

Bias and LDOs .....................................................................................................................................20

Charge Pump ......................................................................................................................................20

Standard Power Modes ......................................................................................................................20

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IAM-20381

5 Programmable Interrupts .................................................................................................................................. 21

Wake-on-Motion Interrupt .....................................................................................................................21

6 Digital Interface ................................................................................................................................................. 22

I2C and SPI Serial Interfaces ....................................................................................................................22

I2C Interface.............................................................................................................................................22

IC Communications Protocol...................................................................................................................22

I2C Terms .................................................................................................................................................24

SPI Interface ............................................................................................................................................25

7 Serial Interface Considerations.......................................................................................................................... 26

IAM-20381 Supported Interfaces............................................................................................................26

8 Register Map...................................................................................................................................................... 27

9 Register Descriptions ......................................................................................................................................... 29

Registers 13 to 15 – Accelerometer Self-Test Registers..........................................................................29

Register 25 – Sample Rate Divider ..........................................................................................................29

Register 26 – Configuration.....................................................................................................................29

Register 28 – Accelerometer Configuration............................................................................................30

Register 29 – Accelerometer Configuration 2.........................................................................................31

Register 31 – Wake-on Motion Threshold (Accelerometer) ...................................................................32

Register 35 – FIFO Enable........................................................................................................................32

Register 54 – FSYNC Interrupt Status......................................................................................................32

Register 55 – INT/DRDY Pin / Bypass Enable Configuration....................................................................32

Register 56 – Interrupt Enable............................................................................................................33

Register 58 – Interrupt Status.............................................................................................................33

Registers 59 to 64 – Accelerometer Measurements ..........................................................................33

Registers 65 and 66 – Temperature Measurement............................................................................34

Register 104 – Signal Path Reset.........................................................................................................34

Register 105 – Accelerometer Intelligence Control............................................................................34

Register 106 – User Control................................................................................................................35

Register 107 – Power Management 1 ................................................................................................35

Register 108 – Power Management 2 ................................................................................................35

Registers 114 and 115 – FIFO Count Registers ...................................................................................36

Register 116 – FIFO Read Write..........................................................................................................36

Register 117 – Who Am I ....................................................................................................................36

Registers 119, 120, 122, 123, 125, 126 Accelerometer Offset Registers............................................37

10 Assembly............................................................................................................................................................ 38

Orientation of Axes.............................................................................................................................38

Package Dimensions ...........................................................................................................................39

11 Part Number Package Marking .......................................................................................................................... 41

12 Reference........................................................................................................................................................... 42

13 Revision History ................................................................................................................................................. 43

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IAM-20381

LIST OF FIGURES

Figure 1. I2C Bus Timing Diagram .............................................................................................................................................................12

Figure 2. SPI Bus Timing Diagram.............................................................................................................................................................13

Figure 3. Pin out Diagram for IAM-20381 3.0x3.0x0.75 mm LGA ............................................................................................................15

Figure 4. IAM-20381 LGA Application Schematic ....................................................................................................................................16

Figure 5. IAM-20381 Block Diagram ........................................................................................................................................................17

Figure 6. IAM-20381 Solution Using I2C Interface....................................................................................................................................18

Figure 7. IAM-20381 Solution Using SPI Interface ...................................................................................................................................19

Figure 8. START and STOP Conditions......................................................................................................................................................22

Figure 9. Acknowledge on the I2C Bus .....................................................................................................................................................23

Figure 10. Complete I2C Data Transfer.....................................................................................................................................................23

Figure 11. Typical SPI Master/Slave Configuration ..................................................................................................................................25

Figure 12. I/O Levels and Connections.....................................................................................................................................................26

Figure 13. Orientation of Axes of Sensitivity and Polarity of Rotation ....................................................................................................38

Figure 14. Package Dimensions................................................................................................................................................................39

Figure 15. Part Number Package Marking ...............................................................................................................................................41

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IAM-20381

LIST OF TABLES

Table 1. Accelerometer Specifications.......................................................................................................................................................8

Table 2. D.C. Electrical Characteristics .......................................................................................................................................................9

Table 3. A.C. Electrical Characteristics .....................................................................................................................................................11

Table 4. Other Electrical Specifications....................................................................................................................................................11

Table 5. I2C Timing Characteristics...........................................................................................................................................................12

Table 6. SPI Timing Characteristics (8 MHz Operation) ...........................................................................................................................13

Table 7. Absolute Maximum Ratings .......................................................................................................................................................14

Table 8. Signal Descriptions .....................................................................................................................................................................15

Table 9. Bill of Materials ..........................................................................................................................................................................16

Table 10. Standard Power Modes for IAM-20381 ...................................................................................................................................20

Table 11. Table of Interrupt Sources........................................................................................................................................................21

Table 12. Serial Interface .........................................................................................................................................................................22

Table 13. I2C Terms .................................................................................................................................................................................. 24

Table 14. Configuration............................................................................................................................................................................30

Table 15. Accelerometer Data Rates and Bandwidths (Low Noise Mode) ..............................................................................................31

Table 16. Accelerometer Filter Bandwidths, Noise, and Current Consumption (Low-Power Mode) ......................................................31

Table 17. Package Dimensions.................................................................................................................................................................40

Table 18. Part Number Package Marking ................................................................................................................................................41

Document Number: DS-000216

Revision: 1.0

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