Data Sheet

Mode Conguration (0x09)
Bits 6:5: Particle-Sensing ADC Range Control
This register sets the particle-sensing sensor ADC’s full-scale range as shown in Table 5.
Bit 7: Shutdown Control (SHDN)
The part can be put into a power-save mode by setting this bit to one. While in power-save mode, all registers retain their
values, and write/read operations function as normal. All interrupts are cleared to zero in this mode.
Bit 6: Reset Control (RESET)
When the RESET bit is set to one, all configuration, threshold, and data registers are reset to their power-on-state through
a power-on reset. The RESET bit is cleared automatically back to zero after the reset sequence is completed.
Note: Setting the RESET bit does not trigger a PWR_RDY interrupt event.
Bits 2:0: Mode Control
These bits set the operating state of the MAX30105. Changing modes does not change any other setting, nor does it
erase any previously stored data inside the data registers.
Particle-Sensing Conguration (0x0A)
Table 4. Mode Control
Table 5. Particle-Sensing ADC Range Control (18-Bit Resolution)
REGISTER B7 B6 B5 B4 B3 B2 B1 B0
REG
ADDR
POR
STATE
R/W
Mode
Conguration
SHDN RESET MODE[2:0] 0x09 0x00 R/W
REGISTER B7 B6 B5 B4 B3 B2 B1 B0
REG
ADDR
POR
STATE
R/W
SpO
2
Conguration
ADC_RGE<1:0> SR[2:0] LED_PW[2:0] 0x0A 0x00 R/W
MODE[2:0] MODE ACTIVE LED CHANNELS
000 Do not use
001 Do not use
010 Particle-sensing mode using 1 LED Red only
011 Particle-sensing mode using 2 LEDs Red and IR
100–110 Do not use
111 Multi-LED mode Green, Red, and/or IR
ADC_RGE[1:0] LSB SIZE (pA) FULL SCALE (nA)
00 7.81 2048
01 15.63 4096
02 31.25 8192
03 62.5 16384
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Maxim Integrated │ 19
MAX30105 High-Sensitivity Optical Sensor
for Smoke Detection Applications