ADIS16220/PCBZ Analog Devices Inc, ADIS16220/PCBZ Datasheet - Page 14

• 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
AVG_CNT[3:0] controls the averaging/decimating filter
structure in binomial steps, starting with 1 and ending with
1024. For example, set AVG_CNT[7:0] = 0x08 (DIN = 0xB608)
to select 256 averages and a decimation rate of 1/256. Note that
the decrease in sample time impacts the total capture time (T
Table 24. AVG_CNT Bit Descriptions
Bit
[15:4]
[3:0]
OFFSET ADJUSTMENT
The ACCL_NULL, AIN1_NULL, and AIN2_NULL registers
provide a bias adjustment function. For example, setting
ACCL_NULL = 0x009D (DIN = 0x829D) increases the accelera-
tion bias by 157 LSB (3 g). Set GLOB_CMD[0] = 1 (DIN =
0x3E01) to execute the autonull function, which loads the
offset registers with a value derived from a 678 ms average of
the acceleration data.
Table 25. ACCL_NULL Bit Descriptions
Bit
[15:0]
Table 26. AIN1_NULL and AIN2_NULL Bit Descriptions
Bit
[15:0]
INPUT/OUTPUT FUNCTIONS
DIO1 and DIO2 are configurable as I/O lines that serve mul-
tiple purposes. The following register priority governs their
operation: DIO_CTRL, then GPIO_CTRL. The DIO_CTRL
register has four application-specific configuration options for
each signal. The capture trigger input option works in conjunction
with the manual capture mode and provides a hardware option
for driving a data capture event. When enabled, this function
searches for a positive pulse and the capture starts on the falling
edge of this pulse. The busy indicator output is active during
capture events and can help prevent undesirable interruptions.
For example, set DIO_CTRL[5:0] = 101111 (DIN = 0xB62F) to
establish DIO2 as a capture trigger input and keep DIO1 as a
positive polarity, busy indicator output. Using the busy indicator
as an interrupt driver enables the master processor to gather
capture data as soon as it is available, without having to poll
inputs or estimate execution times. The alarm indicator output
is active when the trigger set by ALM_CTRL and ALM_MAGx
activates. When configured as general-purpose lines, the
GPIO_CTRL register configures DIO1 and DIO2. For example,
set GPIO_CTRL = 0x0103 (DIN = 0xB203, then 0xB301) to set
DIO1 and DIO2 as outputs, with DIO1 in a 1 state and DIO2 in
a 0 state.
AVG_CNT[7:0] = 0x08 = 8, N = 2
Description (Default = 0x0000)
Reserved
Power-of-two setting for number of averages, binary
Description (Default = 0x0000)
Data bits, twos complement, 19.073 mg/LSB
sensitivity. See Figure 15 for impact on output.
Range = +8191 LSBs/−8192 LSBs
Description (Default = 0x0000)
Data bits, twos complement, 305.18 μV/LSB
sensitivity. Signal path is similar to Figure 15.
Range = +8191 LSBs/−8192 LSBs
8
= 256 averages
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C
):
Table 27. DIO_CTRL Bit Descriptions
Bit
[15:6]
[5:4]
[3:2]
[1]
[0]
Table 28. GPIO_CTRL Bit Descriptions
Bit
[15:10]
[9]
[8]
[7:2]
[1]
[0]
DIAGNOSTICS
In all of the error flags in DIAG_STAT, a 1 identifies an error
condition, whereas a 0 signals normal operation. All of the flags
remain until the next capture or reset command (GLOB_CMD[4]
= 1). DIAG_STAT[1:0] returns to 1 after the next sample (or
capture) if the error conditions still exist. DIAG_STAT[14:12]
provide flags to check the source of an event capture, prior to
reading the entire capture buffer. DIAG_STAT[10:8] offers flags
that check the peak values in the capture against the conditions
in the ALM_CTRL and ALM_MAGx registers. The flash test
produces an error flag in DIAG_STAT[6] to check if the sum of
the internal operating memory matches the sum of the same
flash memory locations. The capture period violation flag
(DIAG_STAT[4]) rises to 1 when the user attempts to use the
SPI while a capture sequence is in progress. Using the DIO1 line
in the factory default configuration as a busy indicator can help
prevent this violation. The SPI communication flag in
DIAG_STAT[3] raises to a Logic 1 when the total number of
SCLK clocks is not a multiple of 16 during a SPI transfer.
Description (Default = 0x000F)
Reserved
DIO2 function selection
00 = general-purpose I/O (use GPIO_CTRL)
01 = alarm indicator output (per ALM_CTRL)
10 = capture trigger inputs
11 = busy indicator output
DIO1 function selection
00 = general-purpose I/O (use GPIO_CTRL)
01 = alarm indicator output (per ALM_CTRL)
10 = capture trigger inputs
11 = busy indicator output
DIO2 line polarity; if [5:4] = 00, see GPIO_CTRL
1 = active high
0 = active low
DIO1 line polarity; if [3:2] = 00, see GPIO_CTRL
1 = active high
0 = active low
Description (Default = 0x0000)
Reserved
General-purpose I/O output level, DIO2
General-purpose I/O output level, DIO1
Reserved
General-purpose I/O Line, data direction control, DIO2
1 = output, 0 = input
General-purpose I/O Line, data direction control, DIO1
1 = output, 0 = input