Data Sheet

ADXL356/ADXL357/ADXL357B

TABLE OF CONTENTS

analog.com

Rev. C | 2 of 52

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

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

Functional Block Diagrams....................................1

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

Specifications........................................................ 4

ADXL356 (Analog Output)..................................4

ADXL357 (Digital Output)...................................5

ADXL357B (Digital Output)................................ 7

SPI Digital Interface Characteristics for the

ADXL357 and ADXL357B................................ 9

I2C Digital Interface Characteristics for the

ADXL357 and ADXL357B.............................. 10

Absolute Maximum Ratings.................................12

Thermal Resistance......................................... 12

Recommended Soldering Profile......................12

ESD Caution.....................................................12

Pin Configurations and Function Descriptions.....13

Typical Performance Characteristics................... 15

ADXL356..........................................................15

ADXL357..........................................................19

ADXL357B........................................................23

Root Allan Variance (RAV) ADXL357/

ADXL357B Characteristics.............................27

Theory of Operation.............................................28

Applications Information...................................... 29

Analog Output.................................................. 29

Digital Output....................................................29

Axes of Acceleration Sensitivity....................... 30

Power Sequencing........................................... 30

Power Supply Description................................ 30

Overrange Protection....................................... 30

Mechanical Headroom vs. Frequency..............31

Self Test............................................................31

Filter................................................................. 31

Serial Communications........................................34

SPI Protocol..................................................... 34

SPI Bus Sharing...............................................34

I2C Protocol...................................................... 35

Reading Acceleration or Temperature Data

From the Interface.......................................... 35

FIFO.................................................................... 37

Interrupts............................................................. 38

DATA_RDY.......................................................38

DRDY Pin.........................................................38

FIFO_FULL...................................................... 38

FIFO_OVR....................................................... 38

Activity..............................................................38

External Synchronization and Interpolation......38

ADXL357/ADXL357B Register Map.................... 41

Register Definitions............................................. 42

Analog Devices ID Register............................. 42

Analog Devices MEMS ID Register..................42

Device ID Register........................................... 42

Product Revision ID Register........................... 42

Status Register.................................................42

FIFO Entries Register.......................................43

Temperature Data Registers............................ 43

X-Axis Data Registers...................................... 43

Y-Axis Data Registers...................................... 44

Z-Axis Data Registers...................................... 44

FIFO Access Register...................................... 45

X-Axis Offset Trim Registers............................ 45

Y-Axis Offset Trim Registers............................ 45

Z-Axis Offset Trim Registers............................ 46

Activity Enable Register................................... 46

Activity Threshold Registers.............................46

Activity Count Register..................................... 47

Filter Settings Register..................................... 47

FIFO Samples Register....................................47

Interrupt Pin (INTx) Function Map Register......48

Data Synchronization....................................... 48

I2C Speed, Interrupt Polarity, and Range

Register.......................................................... 48

Power Control Register.................................... 49

Self Test Register............................................. 49

Reset Register..................................................49

PCB Footprint Pattern......................................... 50

Outline Dimensions............................................. 51

Ordering Guide.................................................51

Output Mode, Measurement Range, and

Specified Voltage Options.............................. 51

Evaluation Boards............................................ 52

REVISION HISTORY

9/2024—Rev. B to Rev. C

Changed Master to Main and Slave to Subordinate (Throughout).................................................................. 1

Changes to General Description Section.........................................................................................................1

Changes to Velocity Random Walk Parameter, Table 3...................................................................................7

Changes to Figure 82 and Figure 83............................................................................................................. 29