ADIS16220/PCBZ Analog Devices Inc, ADIS16220/PCBZ Datasheet - Page 12

• Manufacturer Part Number: ADIS16220/PCBZ
• Description: Vibration Sensor Evaluation Board
• Manufacturer: Analog Devices Inc
• Series: iSensor™r

Specifications of ADIS16220/PCBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Vibration Sensor
• Kit Application Type: Sensing - Motion / Vibration / Shock
• Silicon Core Number: ADIS16220
• Kit Contents: Board
• Sensor Type: Vibration, Accelerometer
• Sensing Range: ±70g
• Interface: SPI Serial
• Sensitivity: 19.073mg/LSB
• Voltage - Supply: 3.15 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: ADIS16220
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADIS16220
CAPTURE MODE CONFIGURATION
The CAPT_CTRL register (see Table 15) offers three modes of
capture operation (manual, automatic, and event), along with a
number of configuration features for supporting these modes.
All three modes use the start/stop bit, located in GLOB_
CMD[11] (see Table 23) to manage the capture operation.
Table 15. CAPT_CTRL Bit Descriptions
Bit
[15:7]
[6]
[5:4]
[3:2]
[1]
[0]
Manual Capture Mode
The factory default configuration for capture mode is the manual
mode. In the manual mode, the ADIS16220 waits for a start
command to execute the capture event. Set GLOB_CMD[11] =
1 (DIN = 0xBF08) to start a capture in this mode. Once the
capture process begins, GLOB_CMD[11] resets to zero and
serves as a stop bit, until the capture event completes. Set
GLOB_CMD[11] = 1 to stop a capture event that is in progress.
Automatic Capture Mode
In the automatic mode, the ADIS16220 executes capture events
periodically, according to the time in CAPT_PRD (see Table 16).
Table 17 provides an example for configuring and starting the
automatic mode. When the device receives the start command,
it executes a capture event, and then starts the countdown for
executing the next capture event. Once the automatic mode
starts, GLOB_CMD[11] becomes a stop bit.
Table 16. CAPT_PRD Register Bit Descriptions
Bit
[15:10]
[9:8]
[7:0]
Description (Default = 0x0020)
Reserved
Automatically store capture buffers to flash upon alarm
trigger (1 = enabled)
Pre-event capture length for event mode
00 = 64 samples
01 = 128 samples
10 = 256 samples
11 = 512 samples
Capture mode
00 = manual: use GLOB_CMD[11] to start capture
01 = automatic: use CAPT_PRD[9:0] to set capture period
10 = event: continuously monitor data for the conditions
set in ALM_CTRL, ALM_MAGA, ALM_MAG1, and ALM_MAG2.
11 = not used
Power-down between capture events
1 = enabled, which requires CS toggle to wake up
Reserved
Description (Default = 0x0000)
Reserved
Scale
00 = 1 second/LSB
01 = 1 minute/LSB
10 = 1 hour/LSB
Data bits, binary format
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Table 17. Example Automatic Mode Configuration Sequence
DIN
0x9F02,
0x9E18
0x9C06
0xBF08
Event Capture Mode
The event mode functions in a manner similar to a single-event
trigger on a digital oscilloscope. This mode is useful for captur-
ing shock events and for preshock motion/vibration analysis.
Once started, it monitors a continuous stream of real-time data for
a preset, event trigger condition. The event trigger settings are in
the following registers: ALM_CTRL (see Table 18), ALM_MAGA
(see Table 19), and ALM_MAG1/ALM_MAG2 (see Table 20).
When the acceleration or analog input signals trip the alarm
trigger settings, the device fills the capture buffers with pre-
trigger and post-trigger data, according to the pre-trigger
configuration in CAPT_CTRL[5:4].
Configuring the device in the event capture mode requires
four steps:
1.
2.
3.
4.
Table 18. ALM_CTRL Bit Descriptions
Bit
[15:6]
[5]
[4]
[3]
[2]
[1]
[0]
Table 19. ALM_MAGA Bit Descriptions
Bit
[15:0]
Select which data channels to enable using ALM_CTRL.
Set each threshold using the ALM_MAGx registers.
Select event capture mode by setting CAPT_CTRL[3:2] = 10.
Start the sampling by setting GLOB_CMD[11] = 1. Table 22
provides an example for configuring the device in this
mode. After the continuously sampling starts, setting
GLOB_CMD[11] = 1 stops the sampling process.
Description (Default = 0x0000)
Reserved
System alarm comparison polarity
1 = trigger when less than ALM_MAGS[11:0]
0 = trigger when greater than ALM_MAGS[11:0]
System alarm trigger source
1 = temperature, 0 = power supply
System alarm enable (ALM_MAGS)
1 = enabled, 0 = disabled
AIN2 alarm enable (ALM_MAG2)
1 = enabled, 0 = disabled
AIN1 alarm enable (ALM_MAG1)
1 = enabled, 0 = disabled
Acceleration alarm enable (ALM_MAGA)
1 = enabled, 0 = disabled
Description (Default = 0x0000)
Data bits for acceleration threshold setting;
twos complement, 19.073 mg/LSB.
Range = +8191 LSBs/−8192 LSBs.
Description
CAPT_PRD[15:8] = 0x02, set time scale to hours
CAPT_PRD[7:0] = 0x18, set the capture period to 24 hours
Set the device for trigger mode and enable shutdown
Start: device executes a capture and shuts down