STEVAL-MKI024V1 STMicroelectronics, STEVAL-MKI024V1 Datasheet - Page 29

• Manufacturer Part Number: STEVAL-MKI024V1
• Description: DEMO BOARD BASED ON LIS331DL
• Manufacturer: STMicroelectronics
• Series: MEMSr

Specifications of STEVAL-MKI024V1

• Design Resources: STEVAL-MKI024V1 Gerber Files STEVAL-MKI024V1 Schematics STEVAL-MKI024V1 Bill of Materials
• Sensor Type: Accelerometer, 3 Axis
• Sensing Range: ±2.3g, 9.2g
• Interface: SPI, USB
• Sensitivity: 72mg/digit
• Voltage - Supply: 5V, USB
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: LIS331DL
• Acceleration: 2 g, 8 g
• Sensing Axis: Triple Axis
• Output Type: Digital
• Interface Type: USB
• Silicon Manufacturer: ST Micro
• Silicon Core Number: LIS331DL
• Kit Application Type: Sensing - Motion / Vibration / Shock
• Application Sub Type: Accelerometer
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8719

UM0692
Note:
7.2.1
7.2.2
7.2.3
7.2.4
Table 1.
AA: register address
DD: data
S: service field
X, Y, Z: Acceleration data returned for the X, Y and Z axes
I1, I2 : interrupt value on each axis.
Start command
The *start command initiates the continuous data acquisition. When this command is sent to
the board, it returns the acceleration data measured by the LIS331DL device. The
acceleration data are packed in a string composed of eight bytes: “
two bytes are always “s” and “t” which correspond to the hexadecimal values {73 74}, while
“X” “Y” “Z” represent, respectively, the acceleration data for the X, Y, Z axes.
“I1” and “I2” contain the values of FF_WU_SRC1 and FF_WU_SRC2, where each bit is a
specific interrupt.
The last byte “s” returns information about the switches mounted on the board. Specifically,
bit#1 and bit#0 of the "service data" correspond to the status of SW3 and SW2 on the
demonstration kit board, and they are set to 1 when the corresponding switch is pressed.
Debug command
The debug command starts the continuous data acquisition in debug mode. When this
command is sent to the board, it returns the acceleration data measured by the LIS331DL
device in readable text format. The values shown on the screen correspond to the content of
the output data registers and are shown as a decimal number. A tab is employed as a
separator between the different fields.
Stop command
The *stop command interrupts any acquisition session that has been started with either the
*start or *debug commands.
Register read
The *rAA command allows the contents of the LIS331DL device registers in the
demonstration kit board to be read. AA, expressed as hexadecimal value and written upper-
case, represents the address of the register to be read.
*bwAA<0:7><0|1>
Command
*wAADD
*Zon
*Zoff
*dev
*ver
Supported commands (continued)
Firmware version
Exit from 3-state
Single bit write
Register write
Force 3-state
Device name
Description
s t x y z I1 I2 s
Supported commands
Returned value
331DL 1.0
LIS331DL
”. The first
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