ADIS16240/PCBZ Analog Devices Inc, ADIS16240/PCBZ Datasheet - Page 14

• Manufacturer Part Number: ADIS16240/PCBZ
• Description: BOARD EVAL FOR ADIS16240
• Manufacturer: Analog Devices Inc
• Series: iMEMS®, iSensor™r

Specifications of ADIS16240/PCBZ

• Sensor Type: Accelerometer, 3 Axis
• Sensing Range: ±19g
• Interface: SPI Serial
• Sensitivity: 51.4mg/LSB
• Voltage - Supply: 2.4 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: ADIS16240
• Silicon Manufacturer: Analog Devices
• Application Sub Type: Shock Sensor
• Kit Application Type: Sensing - Motion / Vibration / Shock
• Silicon Core Number: ADIS16240
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption

ADIS16240
Transient Behavior During Capture
During capture events, the device consumes an increased amount
of current for a short period. Following a capture event, sampling
suspends and the SPI commands are ignored by the sensor for
the pause times that are listed in Table 22.
Table 22. Postcapture Operation Pause Times
Event Length (Samples)
<64
128
256
512
1024
OPERATIONAL CONTROL
Internal Sample Rate
The SMPL_PRD register (see Table 23) provides a user control
for sample rate adjustment, using the following equation:
For example, set SMPL_PRD[7:0] = 0x07 (DIN = 0xC807) to
configure the ADIS16240 to operate at its maximum sample
rate of 4096 SPS. Note that the sample rate affects power dis-
sipation and peak resolution during event capture.
Table 23. SMPL_PRD Register Bit Descriptions
Bit
[15:0]
1
Global Commands
For convenience, the GLOB_CMD register (see Table 24) provides
an array of single-write commands. Setting the assigned bit to 1
activates each function, right after the 16
munication sequence. When the function completes, the bit
restores itself to 0. All commands in the GLOB_CMD register
require the power supply to be within normal limits for the
execution times listed in Table 24. The execution times reflect the
factory default configuration, where applicable, and describe the
time required to return to normal operation. For example, set
GLOB_CMD[2] = 1 (DIN = 0xCA04) to place the part in standby
mode. Set GLOB_CMD[8] = 1 (DIN = 0xCB01) to wake up the
device and return to normal operation.
Input/Output Lines
The ADIS16240 provides two general-purpose digital input/
output lines that offer several functions. When using the factory-
default configuration, MSC_CTRL[2:0] establishes DIO1 as
a positive data-ready output. Change MSC_CTRL[2:0] to 100
(DIN = 0xC604) to make DIO1 a negative data-ready output
signal. ALM_CTRL[2:0] offers a control for setting one of the
digital signals as an alarm indicator. For example, set ALM_
CTRL[2:0] = 110 (DIN = 0xBC06) to set DIO1 as a positive
alarm indicator output signal. When configured as general-
The SMPL_PRD register is located at Address 0x49[15:8] and Address 0x48[7:0].
f
S
=
Description (Default = 0x001F)
Sample rate scale factor, binary format (N
(
N
32768
SR
+
) 1
Pause Time (ms)
2
4
8
16
33
th
SCLK in the SPI com-
SR
1
)
Rev. 0 | Page 14 of 16
purpose lines, the GPIO_CTRL register configures DIO1 and
DIO2. For example, set GPIO_CTRL = 0x0103 (DIN = 0xC403,
then 0xC501) to set DIO1 and DIO2 as outputs, with DIO1 in
a 1 state and DIO2 in a 0 state. In the event of competing assign-
ments, the order of precedence is MSC_CTRL, ALM_CTRL,
and GPIO_CTRL.
Table 24. GLOB_CMD Register Bit Descriptions
Bit
[15:9]
8
7
6
5
4
3
2
1
0
1
2
Table 25. MSC_CTRL Register Bit Descriptions
Bit
15
14
[13:10]
9
8
[7:3]
2
1
0
1
Table 26. GPIO_CTRL Register Bit Descriptions
Bit
[15:10]
9
8
[7:2]
1
0
1
Offset Adjustment
The XACCL_OUT, YACCL_OFF, and ZACCL_OFF registers
add to the sensor outputs and provide a convenient offset adjust-
ment function for each accelerometer output. For example, writing
0x0A to YACCL_OUT[7:0] (DIN = 0xA20A) results in a 514 mg
offset adjustment for the YACCL_OUT output data.
The MSC_CTRL register is located at Address 0x47[15:8] and Address 0x46[7:0].
The GPIO_CTRL register is located at Address 0x45[15:8] and Address 0x44[7:0].
The GLOB_CMD register is located at Address 0x4B[15:8] and Address 0x4A[7:0].
SPI processing and data sampling suspend for the indicated times.
Description
Unused
Wake up from standby mode
Software reset
Clear capture buffer flash memory
Clear peak registers
Clear DIAG_STAT register
Save configuration to flash
Start standby mode for low power
Restore factory-default settings
Auto-null
Description (Default = 0x0006)
Enables sum-of-squares output (XYZPEAK_OUT)
Enables peak tracking output (XPEAK_OUT,
YPEAK_OUT, and ZPEAK_OUT)
Unused
No self-test on startup when set to 1
Self-test enable: 1 = apply electrostatic force, 0 = disabled
Unused
Data-ready enable: 1 = enabled, 0 = disabled
Data-ready polarity: 1 = active high, 0 = active low
Data-ready line selection: 1 = DIO2, 0 = DIO1
Description (Default = 0x0000)
Unused
General-Purpose I/O Line 2 data level
General-Purpose I/O Line 1 data level
Unused
General-Purpose I/O Line 2, data direction control:
1 = output, 0 = input
General-Purpose I/O Line 1, data direction control:
1 = output, 0 = input
Execution Time
N/A
0.2 ms
32 ms
350 ms
N/A
N/A
24 ms
N/A
350 ms
N/A
1
1
1
2