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ADIS16240 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADIS16240
Beschreibung Low Power Programmable Impact Sensor And Recorder
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADIS16240 Datasheet, Funktion
www.DataSheet4U.com
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
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.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
Low Power, Programmable
Impact Sensor and Recorder
ADIS16240
FUNCTIONAL BLOCK DIAGRAM
AN VDD
ADIS16240
POWER
MANAGEMENT
XA
YA
ZA
CMP1
CMP2
TRIPLE-AXIS
MEMS
ACCELEROMETER
TEMPERATURE
SENSOR
ANALOG-
TO-DIGITAL
CONVERSION
AND
PROCESSING
ALARM
DETECTION
EVENT TRIGGER
DIGITAL
CONTROL
AND
SPI
INTERFACE
EVENT
CAPTURE
BUFFER
Figure 1.
CS
SCLK
DIN
DOUT
RST
DIO1
DIO2
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).
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.






ADIS16240 Datasheet, Funktion
ADIS16240www.DataSheet4U.com
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
TOP VIEW
1 2 3 4 5 6 7 8 9 10 11
A
B
C
D
E
F
G
H
J
K
L
NOTES
1. THE ACTUAL PINS ARE NOT
VISIBLE FROM THE TOP VIEW.
Figure 4. Pin Configuration (Top View)
A1
AZ X
AY
AX
AX
AZ
AY
Figure 5. Axis Orientation of Device (Top View)
Table 4. Pin Function Descriptions
Pin No.
E10, E11
F10, F11
G10, G11
H10, H11
J10, J11
K9, L9
K8, L8
K7, L7
K6, L6
K3, L3
J1, J2
H1, H2
G1, G2
A5, B5
D4 to D8, E4, E8, F4, F8, G4, G8, H4 to H8
A1, A2, A10, A11, B1, B2, B10, B11, C3 to C9, D3, D9, E3, E9, F3, F9,
G3, G9, H3, H9, J3 to J9, K1, K2, K10, K11, L1, L2, L10, L11
A3, A4, A6 to A9, B3, B4, B6 to B9, C1, C2, C10, C11, D1, D2, D10,
D11, E1, E2, F1, F2, K4, K5, L4, L5
Mnemonic
SCLK
CS
DIN
DOUT
DIO2
DIO1
AN
CMP2
CMP1
RST
XA
YA
ZA
ST
VDD
GND
NC
Type 1
I
I
I
O
I/O
I/O
I
I
I
I
O
O
O
I
S
S
1 I = input, O = output, I/O = input/output, S = supply.
Description
SPI Serial Clock
SPI Chip Select, Active Low
SPI Data Input
SPI Data Output
Multifunction Digital Input/Output 2
Multifunction Digital Input/Output 1
Analog Input Channel
Analog Comparator Input 2
Analog Comparator Input 1
Reset, Active Low, No Pull-Up Resistor
X-Axis Accelerometer Filter Pin
Y-Axis Accelerometer Filter Pin
Z-Axis Accelerometer Filter Pin
Self-Test Input Control Line
Power Supply, 3.3 V
Ground
No Connect
Rev. 0 | Page 6 of 16

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ADIS16240 pdf, datenblatt
ADIS16240www.DataSheet4U.com
EVENT RECORDER
The ADIS16240 provides a 3 × 8192 (8-bit) buffer memory for
reading transient acceleration data on all three axes (x, y, and z).
There are a number of user controls for tailoring the event recorder
for optimal system-level operation. Alarm 1 and Alarm 2 provide
internal and external trigger options for starting a data capture
sequence.
Internal Trigger Setup
Select the trigger data source for Alarm 1 and Alarm 2 using
ALM_CTRL[15:8] (see Table 12). The ALM_MAG1 and ALM_
MAG2 registers contain threshold magnitude and direction
settings for Alarm 1 and Alarm 2, respectively. The format for
the data bits in these registers matches the trigger data source,
which is set using ALM_CTRL[15:8]. For example, if ALM_
CTRL[15:12] equals 0010, then the format matches that of
XACCL_OUT: 10-bit, twos complement, with 1 LSB = 51.4 mg
of acceleration.
Table 12. ALM_CTRL Register Bit Descriptions1
Bit Description (Default = 0x0000)
[15:12] Alarm 2 source selection
0000 = disabled
0001 = power supply voltage (SUPPLY_OUT)
0010 = x acceleration (XACCL_OUT)
0011 = y acceleration (YACCL_OUT)
0100 = z acceleration (ZACCL_OUT)
0101 = auxiliary ADC voltage (AUX_ADC)
0110 = temperature (TEMP_OUT)
0111 = XYZ peak acceleration (XYZPEAK_OUT)
1000 = external trigger
[11:8] Alarm 1 source selection (same as Alarm 2)
[7:6] Unused
5 Alarm 2 capture trigger: 1 = enabled, 0 = disabled
4 Alarm 1 capture trigger: 1 = enabled, 0 = disabled
3 Unused
2 Alarm indicator enable: 1 = enabled, 0 = disabled
1 Alarm indicator polarity: 1 = positive, 0 = negative
0 Alarm indicator pin: 1 = DIO2, 0 = DIO1
1 The ALM_CTRL register is located at Address 0x3D[15:8] and Address 0x3C[7:0].
Table 13. ALM_MAG1, ALM_MAG2 Register Bit Descriptions1
Bit Description (Default = 0x9000)
15 Threshold direction
1 = active for output greater than alarm magnitude
0 = inactive for output less than alarm magnitude
14 Unused
[13:0] Trigger threshold; bit format matches that of the
register selected by ALM_CTRL[15:8] but is unsigned.
1 The ALM_MAG1 register is located at Address 0x39[15:8] and Address 0x38[7:0].
The ALM_MAG2 register is located at Address 0x3B[15:8] and Address 0x3A[7:0].
Table 14. Internal Trigger Setup Example
DIN Description
0xBD44 Set Alarm 1 and Alarm 2 to ZACCL_OUT
0xB980, Set Alarm 1 to trigger on a measured acceleration
0xB832 that has a magnitude of >2.57 g
0xBB00, Set Alarm 2 to trigger on a measured acceleration
0xBA0A that has a magnitude of <0.5 g
0xBC37 Activate Alarm 1 and Alarm 2 to trigger capture events,
and configure DIO2 as a positive alarm indicator output.
External Trigger Setup
ALM_CTRL[15:8] and XTRIG_CTRL (see Table 15) provide all
of the settings needed to govern the use of the comparator pins
(CMP1, CMP2) as external trigger inputs.
Table 15. XTRIG_CTRL Register Bit Descriptions1
Bit Description (Default = 0x0000)
[15:8] Unused
7 External Trigger 1 direction: 0 = <, 1 = >
6 External Trigger 2 direction: 0 = <, 1 = >
5 External Trigger 1 enable: 1 = enabled, 0 = disabled
4 External Trigger 2 enable: 1 = enabled, 0 = disabled
[3:0] External trigger-level setting (TL), binary format
Note that trigger threshold = TL × supply/24
1 The XTRIG_CTRL register is located at Address 0x3F[15:8] and Address 0x3E[7:0].
Table 16. External Trigger Setup Example
DIN Description
0xBD80 Set Alarm 2 to an external trigger (ALM_CTRL)
0xBE1C Activate and set CMP2 to trigger on signals that are
greater than one-half of the supply voltage (XTRIG_CTRL)
0xBC20 Activate Alarm 2 to trigger data capture (ALM_CTRL)
If the device is in standby mode, an external trigger on CMD1 or
CMD2 awakens the device and initiates an event capture. The first
sample is taken 0.2 ms + sample period (SMPL_PRD[7:0]) after
the trigger edge.
Buffer Memory Configuration
CAPT_CTRL (see Table 17) manages the buffer memory for the
event recorder using two programmable controls: event length and
pretrigger length.
Table 17. CAPT_CTRL Register Bit Descriptions1
Bit Description (Default = 0x0022)
[15:8] Unused
[7:4] Pretrigger length control factor (P), binary format
3 Unused
[2:0] Event length control factor (T), binary format
1 The CAPT_CTRL register is located at Address 0x43[15:8] and Address 0x42[7:0].
The event length (NL) also determines the number of events (NE)
that the buffer can store at one time.
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