Maxim公司的MAX30110是完整的光学血氧和心率检测模拟前端(AFE),具有高分辨率光读出的信号处理通路,并内置了环境光消除和大电流LED驱动DAC,形成完整的光读出信号链.和蔼外接LED和光二极管,MAX30110是腕式应用的最低功耗最高性能心率检测解决方案.主电源1.8V,支持标准SPI兼容接口,主要用在腕式可穿戴设备,耳内可穿戴设备,SpO2监测设备和健身可穿戴设备.本文介绍了MAX30110主要优势和特性,框图,典型应用电路图以及评估板MAX30110 EVK包括Micro-PCB,传感器PCB1和传感器PCB2在内的主要特性,电路图,材料清单和详细的PCB设计图.

The MAX30110 is a complete optical pulse oximetry and heart rate detection integrated analog front-end. The MAX30110 has a high-resolution, optical readout signal-processing channel with built-in ambient light cancellation,as well as high-current LED driver DACs, to form a completeoptical readout signal chain. With external LED(s) and photo diode(s), the MAX30110 offers the lowest power, highest performance heart rate detection solution for wrist applications.

The MAX30110 operates on a 1.8V main supply voltage, with a separate 3.1V to 5.25V LED driver power supply. The device supports a standard SPI compatible interface, as well as shutdown modes through the software with near-zero standby current, allowing the power rails to remain powered at all times.

MAX30110主要优势和特性:

Reflective or Transmissive Heart Rate, Heart Rate Variability, or SpO2 Monitoring

Transmit SectionTwo 8-bit LED Current DACs

Four Current Ranges 50mA, 100mA, 150mA, 200mA

Low Noise Current Sources for High Peak Transmit to Receive Dynamic Range

Low 160mV Dropout to Support Direct Drive From Rechargeable Li Battery

High Output Impedance and High Supply Rejection to Support Unregulated Supply or Direct Drive From Boost Switcher Supply

Receive Section19-bit Optical ADC Path to Support the Lowest Perfusions Situations

Low 25pA-RMS Input Referred Noise to Minimize LED Power Under Most Conditions

High Ambient Light Input Range of 200μA and to Support Extraction of HRM Signal in the Most Adverse Lighting Conditions

Built-in Front And Back-End Ambient Light Cancellation,Improving Rejection and Eliminating SystemComplexity of Dealing with Ambient Light

Short Exposure Pulse Widths of 52μs, 104μs, 206μs, 417μs for Efficient Uses of LED Light

Multiple Sample Rate Options from 20sps to 3.2ksps

Ultra-Low-Power Operation for Mobile and Body-Wearable DeviceDynamic Power-Down Modes to 100sps forLow-Power Consumption

Full AFE Power Consumption of Less Than 25μA (Typ) at 25sps

Large 32 Sample FIFO to Support Batch Processing in the Microcontroller

Variety of System Monitors Mappable to Interrupts to Off-Load System Monitoring Functions From the Microcontroller

Low Shutdown Current = 1.4μA (typ)

SPI Interface

Supports a Single 1.8V Supply with Separate 3.1V to 5.25V LED Supply

Miniature 2.8mm x 2.0mm, 6x4, 0.4mm Ball Pitch WLP Package

-40 ℃ to +85℃ Operating Temperature Range

MAX30110应用:

Wrist-Worn Wearable Devices

In-Ear Wearable Devices

SpO2 Monitoring Devices

Fitness Wearable Devices

图1.MAX30110框图

图2.MAX30110典型应用电路图

评估板MAX30110 EVK

The MAX30110 evaluation kit (EV kit) allows for the quick evaluation of the MAX30110 and MAX30112 optical AFE for applications at various sites on the body, particularly the wrist. MAX30110 supports standard SPI compatible interface, whereas MAX30112 supports I2C compatible interface. The EV kit allows flexible configurations to optimize measurement signal quality at minimal power consumption. The EV kit helps the user quickly learn how to configure and use the MAX30110 and MAX30112.

The EV kit consists of three boards. MAX30110_UC_ EVKIT is the main data acquisition board while MAX30110_ SFH7050_EVKIT and MAX30110_OSB_EVKIT are the sensor daughter boards in which the MAX30110 devices are placed in different optical configurations. The EV kit is powered using the USB supply to generate +1.8V for the AFE and accelerometer and +4.5V for the LEDs. The EV kit comes with a MAX30110EWG+ in a 24-bump wafer-level package (WLP).

评估板MAX30110 EVK主要特性:

Quick Evaluation of the MAX30110

Supports Optimization of Configurations

Facilitates Understanding MAX30110 Architecture and Solution Strategy

Real-Time Monitoring

Data-Logging Capabilities

USB-Powered

On-Board Accelerometer

图3.评估板MAX30110 EVK硬件建立图(Micro-PCB)

图4.评估板MAX30110 EVK硬件建立图(传感器PCB1)

图5.评估板MAX30110 EVK硬件建立图(传感器PCB1-顶视图)

图6.评估板MAX30110 EVK硬件建立图(传感器PCB2-底视图)

图7.评估板MAX30110 EVK硬件建立图(传感器PCB2-顶视图)

评估板MAX30110 EVK材料清单:

MAX30110_UC_EVKIT

MAX30110_OSB_EVKIT:

MAX30110_SFH7050_EVKIT:

图8.MAX30110_UC_EVKIT电路图

图9.MAX30110_OSB_EVKIT电路图

图10.MAX30110_SFH7050_EVKIT电路图

图11.MAX30110_UC_EVKIT PCB设计图:顶层丝印

图12.MAX30110_UC_EVKIT PCB设计图:顶层

图13.MAX30110_UC_EVKIT PCB设计图:层2地GND

图14.MAX30110_UC_EVKIT PCB设计图:层3地GND

图15.MAX30110_UC_EVKIT PCB设计图:底层

图16.MAX30110_UC_EVKIT PCB设计图:底层丝印

图17.MAX30110_OSB_EVKIT PCB设计图:顶层丝印

图18.MAX30110_OSB_EVKIT PCB设计图:顶层

图19.MAX30110_OSB_EVKIT PCB设计图:层2 SIGS

图20.MAX30110_OSB_EVKIT PCB设计图:层3GND

图21.MAX30110_OSB_EVKIT PCB设计图:层4 SIGS

图22.MAX30110_OSB_EVKIT PCB设计图:层5 SIGS

图23.MAX30110_OSB_EVKIT PCB设计图:底层

图24.MAX30110_OSB_EVKIT PCB设计图:底层丝印

图25.MAX30110_SFH7050_EVKIT PCB设计图:左:顶层丝印;右:顶层

图26.MAX30110_SFH7050_EVKIT PCB设计图:电源

图27.MAX30110_SFH7050_EVKIT PCB设计图:左:GND;右:底层

图28.MAX30110_SFH7050_EVKIT PCB设计图:底层丝印

Maxim公司介绍

MAXIM是美信公司(Maxim Integrated Products)的英文缩写，全球最好的模拟信号和混合信号半导体公司。同时MAXIM也是一款时尚潮流杂志的名字，maxim内容涵盖了音乐、体育、电视、电影、潮流名人等。也是比较温和的男性杂志，以更多的消遣内容为主。

2001年，Maxim并购了著名的Dallas Semiconductor。是全球最好的模拟信号和混合信号半导体公司.

它们的使命是不断创造高品质的模拟工程解决方案，在世界范围内为基于微处理器的电子产品客户提供增值服务。它们通过努力达到它们的成本与业绩Maxim Integrated Products成立于1983年，总部位于美国加利福尼亚的Sunnyvale，公司拥有9300多名员工，是世界范围内模拟和混合信号集成产品的设计、开发与生产领域的领导者之一。通过对温度、压力、声音等现实世界的各种信号进行检测、放大，并将其转换成计算机处理所需要的数字信号, Maxim的电路把现实世界与数字世界“连接”在一起。

目标、缩短新品上市时间并不断提高它们的生产能力，坚持不懈地为它们的客户和公司股权持有者提供最好的服务。

任何电子产品的核心都是一个数字核，它与人类、真实的物理世界、供电电源及其它数字系统相关联。Maxim是全球模拟、混合信号、高频及数字电路设计、研发、制造的领导者，所提供的产品能够实现上述数字内核与周边系统的连接。它们在世界范围内拥有大约35,000个大型客户。

它们的半导体产品是连接数字处理器与物理世界的桥梁。