Silicon Laboratories IRSLIDER2EK Si1142 User Manual page 8

Si1142 Infrared Slider Demo Kit
Name Label
G0 Rad1
G1 Rad2
G2 X(mm)
G3 Y(mm)
G4 iLED1
G5 iLED2
G6 VIS
G7 IR
G8 PS1
G9 PS2
G10 VIS s
G11 IR st
G12 PS st
G13 PS1bl
G14 PS2bl
G15 N/A
G16 N/A
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Table 1. Generic Data Channels
Type
Linearized Distance Measurements
Estimated Location Coordinates
LED Drive Current Levels
AutoRanging Ambient Outputs
AutoRanging PS Outputs
State of Ambient Visible System
State of Ambient IR System
State of PS System
PS Baseline Levels
Unused
Description
Using characterization of the PS measurements with
objects at certain distances, it is possible to estimate the
distance of an object based on the PS measurement
value. These three channels represent the distance esti-
mations for each LED's measurement.
With the approximate distance measurements above, an
estimation of X and Y position can be made. These esti-
mations are given in units of mm.
Each LED driver has a specific LED drive current setting
for it. These values are given in units of mA.
AutoRanging will automatically change the modes of the
photodiodes to avoid saturation. When changing modes,
the raw data output changes levels, but AutoRanging will
scale the raw data so that all measurements are on the
same scale. The output from this channel is the pro-
These channels are the AutoRanging PS output from
the device. Raw data measurements are processed by
the AutoRanging firmware to make all the readings
across different modes have the same magnitude. Since
the device switches modes to compensate for ambient
These channels help indicate what mode the sensor is
in during each of their respective measurements. The
four possible modes are as follows, Low Light, High
Sensitivity, High Signal, and Sunlight. These modes are
numbered from zero to three. For more information
about each mode, please consult the data sheet.
AutoRanging uses baselining to determine the no-detect
threshold for readings. Any readings below the values
shown on these channels will be considered no-detect
readings. Any values higher than this baseline will be
shown in the AutoRanging PS Outputs above.
The unused channels are not in use by software, but
they are available in firmware to use as needed.
Rev. 0.2