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IAM-20680
High Performance Automotive 6-Axis MotionTracking Device
GENERAL DESCRIPTION
The IAM-20680 is a 6-axis MotionTracking device for
Automotive applications that combines a 3-axis
gyroscope and a 3-axis accelerometer in a small
3x3x0.75mm (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-20680, with its 6-axis
integration, enables manufacturers to eliminate the
costly and complex selection, qualification, and system
level integration of discrete devices, guaranteeing
optimal motion performance.
The gyroscope has a programmable full-scale range of
±250 dps, ±500 dps, ±1000 dps, and ±2000 dps. 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
Self
test
X Gyro
Self
test
Y Gyro
Self Z Gyro
test
ADC
ADC
ADC
ADC
ADC
ADC
Temp Sensor
ADC
Charge
Pump
IAM-20680
Interrupt
Status
Register
FIFO
User & Config
Registers
Sensor
Registers
Slave I2C and
SPI Serial
Interface
Bias & LDOs
VDD
GND REGOUT
INT
NCS
SDO
SCLK
SDI
FSYNC
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-20680
AXES TEMP RANGE
X,Y,Z -40°C to +85°C
†Denotes RoHS and Green-compliant package
* Moisture sensitivity level of the package
FEATURES
PACKAGE
16-Pin LGA
MSL*
3
• Digital-output X-, Y-, and Z-axis angular rate
sensors (gyroscopes) with a user-programmable
full-scale range of ±250 dps, ±500 dps,
±1000 dps, and ±2000 dps and integrated 16-bit
ADCs
• 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 gyroscope,
accelerometer, and temperature sensor
• Self-test
• Wake-on-motion interrupt for low power
operation of applications processor
• Reliability testing performed according to
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-20680
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-000196
Revision: 1.1
Rev. Date: 01/30/2018

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IAM-20680
TABLE OF CONTENTS
General Description .............................................................................................................................................1
Block Diagram ......................................................................................................................................................1
Applications .........................................................................................................................................................1
Ordering Information...........................................................................................................................................1
Features ...............................................................................................................................................................1
Typical Operating Circuit......................................................................................................................................1
1 Introduction ......................................................................................................................................................... 7
1.1 Purpose and Scope....................................................................................................................................7
1.2 Product Overview......................................................................................................................................7
1.3 Applications...............................................................................................................................................7
2 Features ............................................................................................................................................................... 8
2.1 Gyroscope Features ..................................................................................................................................8
2.2 Accelerometer Features............................................................................................................................8
2.3 Additional Features ...................................................................................................................................8
3 Electrical Characteristics ...................................................................................................................................... 9
3.1 Gyroscope Specifications ..........................................................................................................................9
3.2 Accelerometer Specifications..................................................................................................................10
3.3 Electrical Specifications...........................................................................................................................11
3.4 I2C Timing Characterization.....................................................................................................................14
3.5 SPI Timing Characterization ....................................................................................................................15
3.6 Absolute Maximum Ratings ....................................................................................................................16
3.7 Thermal Information ...............................................................................................................................16
4 Applications Information ................................................................................................................................... 17
4.1 Pin Out Diagram and Signal Description .................................................................................................17
4.2 Typical Operating Circuit.........................................................................................................................18
4.3 Bill of Materials for External Components ..............................................................................................18
4.4 Block Diagram .........................................................................................................................................19
4.5 Overview .................................................................................................................................................19
4.6 Three-Axis MEMS Gyroscope with 16-bit ADCs and Signal Conditioning ...............................................20
4.7 Three-Axis MEMS Accelerometer with 16-bit ADCs and Signal Conditioning.........................................20
4.8 I2C and SPI Serial Communications Interfaces ........................................................................................20
4.9 Self-Test...................................................................................................................................................21
4.10 Clocking...............................................................................................................................................21
4.11 Sensor Data Registers .........................................................................................................................21
4.12 FIFO.....................................................................................................................................................22
4.13 Interrupts............................................................................................................................................22
4.14 Digital-Output Temperature Sensor ...................................................................................................22
4.15 Bias and LDOs .....................................................................................................................................22
4.16 Charge Pump ......................................................................................................................................22
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Revision: 1.1
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IAM-20680
4.17 Standard Power Modes ......................................................................................................................22
4.18 Sensor Initialization and Basic Configuration .....................................................................................22
5 Programmable Interrupts .................................................................................................................................. 24
5.1 Wake-on-Motion Interrupt .....................................................................................................................24
6 Digital Interface ................................................................................................................................................. 25
6.1 I2C and SPI Serial Interfaces ....................................................................................................................25
6.2 I2C Interface.............................................................................................................................................25
6.3 IC Communications Protocol...................................................................................................................25
6.4 I2C Terms .................................................................................................................................................27
6.5 SPI Interface ............................................................................................................................................27
7 Serial Interface Considerations.......................................................................................................................... 29
7.1 IAM-20680 Supported Interfaces............................................................................................................29
8 Register Map...................................................................................................................................................... 30
9 Register Descriptions ......................................................................................................................................... 32
9.1 Registers 0 to 2 – Gyroscope Self-Test Registers ....................................................................................32
9.2 Registers 13 to 15 – Accelerometer Self-Test Registers..........................................................................32
9.3 Register 19 – Gyro Offset Adjustment Register ......................................................................................33
9.4 Register 20 – Gyro Offset Adjustment Register ......................................................................................33
9.5 Register 21 – Gyro Offset Adjustment Register ......................................................................................33
9.6 Register 22 – Gyro Offset Adjustment Register ......................................................................................33
9.7 Register 23 – Gyro Offset Adjustment Register ......................................................................................33
9.8 Register 24 – Gyro Offset Adjustment Register ......................................................................................34
9.9 Register 25 – Sample Rate Divider ..........................................................................................................34
9.10 Register 26 – Configuration ................................................................................................................34
9.11 Register 27 – Gyroscope Configuration ..............................................................................................35
9.12 Register 28 – Accelerometer Configuration .......................................................................................35
9.13 Register 29 – Accelerometer Configuration 2.....................................................................................36
9.14 Register 30 – Low Power Mode Configuration ...................................................................................37
9.15 Register 31 – Wake-on Motion Threshold (Accelerometer)...............................................................37
9.16 Register 35 – FIFO Enable ...................................................................................................................38
9.17 Register 54 – FSYNC Interrupt Status..................................................................................................38
9.18 Register 55 – INT/DRDY Pin / Bypass Enable Configuration ...............................................................38
9.19 Register 56 – Interrupt Enable............................................................................................................39
9.20 Register 58 – Interrupt Status.............................................................................................................39
9.21 Registers 59 to 64 – Accelerometer Measurements ..........................................................................39
9.22 Registers 65 and 66 – Temperature Measurement............................................................................40
9.23 Registers 67 to 72 – Gyroscope Measurements .................................................................................40
9.24 Register 104 – Signal Path Reset.........................................................................................................41
9.25 Register 105 – Accelerometer Intelligence Control............................................................................41
9.26 Register 106 – User Control................................................................................................................42
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Revision: 1.1
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IAM-20680
9.27 Register 107 – Power Management 1 ................................................................................................42
9.28 Register 108 – Power Management 2 ................................................................................................43
9.29 Registers 114 and 115 – FIFO Count Registers ...................................................................................43
9.30 Register 116 – FIFO Read Write..........................................................................................................44
9.31 Register 117 – Who Am I ....................................................................................................................44
9.32 Registers 119, 120, 122, 123, 125, 126 Accelerometer Offset Registers............................................44
10 Assembly............................................................................................................................................................ 46
10.1 Orientation of Axes.............................................................................................................................46
10.2 Package Dimensions ...........................................................................................................................47
11 Part Number Package Marking .......................................................................................................................... 49
12 Reference........................................................................................................................................................... 50
13 Revision History ................................................................................................................................................. 51
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LIST OF FIGURES
Figure 1. I2C Bus Timing Diagram .............................................................................................................................................................14
Figure 2. SPI Bus Timing Diagram.............................................................................................................................................................15
Figure 3. Pin out Diagram for IAM-20680 3.0x3.0x0.75mm LGA .............................................................................................................17
Figure 4. IAM-20680 LGA Application Schematic ....................................................................................................................................18
Figure 5. IAM-20680 Block Diagram ........................................................................................................................................................19
Figure 6. IAM-20680 Solution Using I2C Interface....................................................................................................................................20
Figure 7. IAM-20680 Solution Using SPI Interface ...................................................................................................................................21
Figure 8. START and STOP Conditions......................................................................................................................................................25
Figure 9. Acknowledge on the I2C Bus .....................................................................................................................................................26
Figure 10. Complete I2C Data Transfer.....................................................................................................................................................26
Figure 11. Typical SPI Master/Slave Configuration ..................................................................................................................................28
Figure 12. I/O Levels and Connections.....................................................................................................................................................29
Figure 14. Orientation of Axes of Sensitivity and Polarity of Rotation ....................................................................................................46
Figure 15. Package Dimensions................................................................................................................................................................47
Figure 16. Part Number Package Marking ...............................................................................................................................................49
Document Number: DS-000196
Revision: 1.1
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