1. Product Parameters​​

​​Core Chip​​: MAX30105

​​Input Voltage​​:

Analog Power (VDD): 1.7V-2.0V DC

LED Driver (VLED+): 3.0V-5.5V DC

​​Optical Specifications​​:

LED Wavelength: Red 660nm ±10nm, Infrared 880nm ±10nm

Particle Detection Range: 0.1μm-1.0μm (Smoke/Dust)

​​Interface​​: I²C (Default Address 0x57, 100kHz/400kHz Rate)

​​Power Consumption​​:

Operating Current: 600μA (Full-Function Mode)

Standby Current: 0.7μA (Typ.)

​​Sampling Capability​​:

ADC Resolution: 18-bit

Sample Rate: 50SPS to 3.2kSPS (Programmable)

​​Settingal​​:

Operating Temperature: -40°C to +85°C (Reliable)

Ambient Light Rejection: Built-in Algorithm.

​​2. Key Pin Functions​​

​​VDD​​: Analog Power Input (1.7V-2.0V). Use 10μF Ceramic Cap to GND.

​​VLED+​​: LED Driver Power (3.0V-5.5V). Stabilize with 100μF Electrolytic Cap.

​​GND​​: Analog Ground (Single-Point Connection with PGND).

​​PGND​​: LED Driver Ground (Independent Wiring to GND).

​​SCL/SDA​​: I²C Lines (Open-Drain, Require 4.7kΩ Pull-Up Resistors).

​​INT​​: Interrupt Output (Active Low, Configurable for Data Ready/Alerts).

​​R_DRV/IR_DRV​​: Direct LED Cathode Connection for Red/Infrared LEDs.

​​3. FAQ​​

​​Q1: I²C Communication Failure?​​

Ensure Address 0x57 (ADDR Floating), Add 4.7kΩ Pull-Ups to SCL/SDA, Soft Reset via Register 0x09 (Write 0x40).

​​Q2: Data Noise from Ambient Light?​​

Enable Ambient Light Suppression (Register 0x0F BIT3=1), Reduce Sample Rate to 100SPS (Register 0x0A).