Low Power, Programmable

Impact Sensor and Recorder

ADIS16240

Rev. 0

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FEATURES

Digital triple-axis accelerometer, ±19 g

Programmable event recorder

Internal and external trigger inputs

Low power operation

Sleep mode current: 100 μA

Continuous sampling current: 1 mA, 1 kSPS

Wake-up and record function

External trigger input and SPI trigger command

Peak acceleration sample-and-hold

Peak XYZ sum-of-squares output

1600 Hz (X, Y) and 550 Hz (Z) sensor bandwidth

Digitally controlled bias correction

Digitally controlled sample rate, up to 4096 SPS

Programmable alarms for condition monitoring

Programmable digital input/output lines

Data-ready output and alarm indicator output

Real-time clock

Digitally activated self-test

Embedded temperature sensor

Programmable power management

SPI-compatible serial interface

Auxiliary 10-bit ADC input

Two analog trigger inputs with programmable threshold

Single-supply operation: 2.4 V to 3.6 V

>4000 g powered shock survivability

APPLICATIONS

Crash or impact detection

Condition monitoring of valuable goods

Safety, shut-off sensing

Impact event recording

Security sensing and tamper detection

FUNCTIONAL BLOCK DIAGRAM

TRIPLE-AXIS

MEMS

ACCELEROMETER

TEMPERATURE

SENSOR

ANALOG-

TO-DIGITAL

CONVERSION

AND

PROCESSING

DIGITAL

CONTROL

AND

SPI

INTERFACE

POWER

MANAGEMENT

EVENT

CAPTURE

BUFFER

ALARM

DETECTION

EVENT TRIGGER

CS

SCLK

DIN

DOUT

DIO2

DIO1

RST

VDD

AN

XA

YA

ZA

CMP1

ADIS16240

CMP2

Figure 1.

GENERAL DESCRIPTION

The ADIS16240 is a fully integrated digital shock detection and

recorder system. It combines industry-leading iMEMS® technology

with a signal processing solution that optimizes dynamic perfor-

mance for low power applications. The triple-axis sensing element

enables shock measurement in all directions, eliminating the need

for additional sensors and complex mechanical structures for

many applications. The digital serial peripheral interface (SPI)

uses four wires and is compatible with most processor platforms.

The SPI interface provides access to sensor data and a set of config-

uration registers that control such operational parameters as

offset bias correction, sample rate, sleep mode, peak detection,

and event capture.

The programmable event recorder offers two trigger modes. The

internal mode monitors continuous sampled data and triggers the

capture, based on the user-defined threshold. The external mode

uses the two comparator inputs and a user-defined threshold to

trigger the event captures. This function also provides user configu-

ration controls for capture length, pretrigger data, and data storage.

Each event is stored with a header that captures temperature, power

supply, and time. Several power management features, including

sleep mode and a wake-up function, enable power optimization

with respect to specific mechanical system requirements.

The ADIS16240 is available in a 12 mm × 12 mm laminate-based

ball grid array (BGA) that meets IPC/JEDEC standards for Pb-free

solder reflow processing (J-STD-020C and J-STD-033).