Data Sheet

Timing for Measurements and Data
Collection
Slot Timing in Multi-LED Modes
The MAX30105 can support up to three LED channels
of sequential processing (Red, IR, and Green). In multi-
LED modes, a time slot or period exists between active
sequential channels. Table 14 below displays the the four
possible channel slot times associated with each pulse
width setting. Figure 3 shows an example of channel slot
timing for a particle-sensing mode application with a 1kHz
sample rate.
Table 14. Slot Timing
RED LED
660nm
Red On
69μs
Red Off
931μs
IR On
69μs
IR Off
931μs
358μs
INFRARED LED
880nm
Figure 3. Channel Slot Timing for the Multi-LED Mode with a 1kHz Sample Rate
PULSE-WIDTH SETTING (Μs)
CHANNEL SLOT TIMING (TIMING
PERIOD BETWEEN PULSES) (Μs)
CHANNEL-CHANNEL TIMING (RISING
EDGE-TO-RISING EDGE) (Μs)
69 358 427
118 407 525
215 505 720
411 696 1107
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MAX30105 High-Sensitivity Optical Sensor
for Smoke Detection Applications