Datasheet

Detailed Description
The MAX30102 is a complete pulse oximetry and heart-rate
sensor system solution module designed for the demanding
requirements of wearable devices. The device maintains a
very small solution size without sacrificing optical or electrical
performance. Minimal external hardware components are
required for integration into a wearable system.
The MAX30102 is fully adjustable through software registers,
and the digital output data can be stored in a 32-deep
FIFO within the IC. The FIFO allows the MAX30102 to be
connected to a microcontroller or processor on a shared
bus, where the data is not being read continuously from
the MAX30102’s registers.
SpO
2
Subsystem
The SpO
2
subsystem of the MAX30102 contains ambient
light cancellation (ALC), a continuous-time sigma-delta
ADC, and a proprietary discrete time filter. The ALC has
an internal Track/Hold circuit to cancel ambient light and
increase the effective dynamic range. The SpO
2
ADC has
programmable full-scale ranges from 2µA to 16µA. The
ALC can cancel up to 200µA of ambient current.
The internal ADC is a continuous time oversampling
sigma-delta converter with 18-bit resolution. The ADC
sampling rate is 10.24MHz. The ADC output data rate
can be programmed from 50sps (samples per second) to
3200sps.
Temperature Sensor
The MAX30102 has an on-chip temperature sensor for
calibrating the temperature dependence of the SpO
2
sub-
system. The temperature sensor has an inherent resolu-
tion of 0.0625°C.
The device output data is relatively insensitive to the
wavelength of the IR LED, where the Red LED’s wave-
length is critical to correct interpretation of the data. An
SpO
2
algorithm used with the MAX30102 output signal
can compensate for the associated SpO
2
error with ambient
temperature changes.
LED Driver
The MAX30102 integrates Red and IR LED drivers to
modulate LED pulses for SpO
2
and HR measurements.
The LED current can be programmed from 0 to 50mA
with proper supply voltage. The LED pulse width can be
programmed from 69µs to 411µs to allow the algorithm to
optimize SpO
2
and HR accuracy and power consumption
based on use cases.
880nm660nm
ADC
AMBIENT LIGHT
CANCELLATION
ANALOG
ADC
DIE TEMP
OSCILLATOR
DIGITAL
FILTER
DIGITAL
DATA
REGISTER
LED DRIVERS
I
2
C
COMMUNICATION
INT
SDA
SCL
V
DD
V
LED
+
N.C.N.C.
GND PGND
RED IR
VISIBLE+IR
MAX30102
www.maximintegrated.com
Maxim Integrated │ 9
MAX30102 High-Sensitivity Pulse Oximeter and
Heart-Rate Sensor for Wearable Health
Functional Diagram