IRSLIDEREK Silicon Laboratories Inc, IRSLIDEREK Datasheet - Page 6

• Manufacturer Part Number: IRSLIDEREK
• Description: BOARD EVAL IR SLIDER SI1120
• Manufacturer: Silicon Laboratories Inc
• Series: QuickSense™r

Specifications of IRSLIDEREK

• Sensor Type: Proximity, Infrared
• Sensing Range: 1 Slider
• Interface: USB
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: C8051F900, Si1120
• Operating Voltage: 5 V
• Description/function: Evaluation Kit
• Interface Type: USB
• Software: Software Included
• For Use With/related Products: Si1120
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Supply: -
• Sensitivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1817

Si1120 Infrared Slider Demo Kit
5.1. Channel Selection
Selecting which channels to display is a simple matter of checking the appropriate boxes over the board
photograph, shown in Figure 4.
There are three different types of measurements available from the example firmware:
1. Raw infrared proximity and ambient light measurements. The infrared channels are yellow (D1) and cyan (D2),
2. Linearized distance measurements for each IR channel. The raw proximity values output from the Si1120 will be
3. Calculated coordinate measurements. The linearized D1 and D2 measurements are used to calculate both an X
Due to the nature of infrared proximity measurements, the object’s size and reflectivity will have an impact on the
values measured.
5.2. Gestures and Ambient Light Conditions
In addition to infrared and ambient light measurements and distance calculations, the example firmware contains
algorithms for gesture recognition and ambient light condition detection. When connected to the board with the
Performance Analysis Tool, two group windows will appear, as shown in Figure 5. When a gesture is recognized by
firmware, the gesture name and parameter information will be added to the top of the 2D Gesture group. Three
gestures are supported by the example code. The parameters for each gesture are listed in Table 1. The detected
ambient light conditions (sunlight, incandescent/halogen, or fluorescent) will be displayed in the Light Type.
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while the ambient light channel is white. The data for these channels represents a measurement of the duration
of the Si1120’s PRX low time, as seen by the C8051F930 MCU. The Y axis indicates the number of 6.125 MHz
clock cycles that occurred while PRX was low. The maximum output limit of the Si1120 is 2 ms, which would
correspond to 12250 counts of a 6.125 MHz clock.
exponentially larger the closer an object is to the sensor. The blue and red channels labeled “Radius 1” and
“Radius 2” are linearizations of the raw data output from the sensor when illuminating D1 and D2, respectively.
(left-to-right) and a Z (far-to-near) measurement, which are displayed on the purple and green channels,
respectively.
Figure 5. Performance Analysis Tool Group Windows
Figure 4. Channel Selection
Rev. 0.2