Data Sheet

Timing in Particle-Sensing Mode Using 1 LED

The internal FIFO stores up to 32 samples, so that the

system processor does not need to read the data after

every sample (Figure 5).

Figure 5. Timing for Data Acquisition and Communication When in Particle-Sensing Mode Using 1 LED

Table 16. Events Sequence for Figure 5 in Particle-Sensing Mode Using 1 LED

EVENT DESCRIPTION COMMENTS

1 Enter Particle-Sensing Mode

C Write Command sets MODE[2:0] = 0x02. Mask the DATA_RDY

Interrupt.

2 FIFO is Almost Full, Interrupt Generated Interrupt is generated when the FIFO has only one empty space left.

3 FIFO Data is Read, Interrupt Cleared

4 Next Sample is Stored

New sample is stored at the new read pointer location. Effectively, it is

now the rst sample in the FIFO.

INT

C Bus

LED

OUTPUTS

SAMPLE #1 SAMPLE #2 SAMPLE #3 SAMPLE #30 SAMPLE #31

1 2 3 4

15ms TO 300ms

IR IR IR IR IR IR

www.maximintegrated.com

Maxim Integrated

│

MAX30105 High-Sensitivity Optical Sensor

for Smoke Detection Applications