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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
ADC
ADC
Temp Sensor
ADC
IAM-20381
Interrupt
Status
Register
FIFO
User & Config
Registers
Sensor
Registers
Slave I2C and
SPI Serial
Interface
INT
CS
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*
3
†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
VDDIO
1
SCL SCL/SPC 2
SDA SDA/SDI 3
AD0 SA0/SDO 4
CS 5
IAM-20381
GND
13
RESV
12
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
Document Number: DS-000216
Revision: 1.0
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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
Document Number: DS-000216
Revision: 1.0
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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
Document Number: DS-000216
Revision: 1.0
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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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