MAXREFDES1044: Heart-Rate Monitor Using the MAX30101


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Reference Guide


The MAXREFDES1044 is a reference design for the MAX30101 and several other Maxim® products that demonstrates how a small size, low cost, low power, high accuracy heart-rate monitor can be easily implemented. This design can monitor heart rate using red, infrared (IR), or green LEDs.

The MAX30101 is an integrated pulse oximetry and heartrate monitor module. It includes internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection. Other Maxim components used in this design include two MAX8892 (a high PSRR, low-dropout, 150mA linear regulator) to supply 1.8V and 3.3V for the rest of the design and a MAX1555 single-cell lithium-ion (Li+) battery charger to charge a Li+ battery. Two MAX40200 (an ideal diode current-switch) are also included to allow either the battery or VBUS from the USB port to supply power. The MAX40200 ideal diode has a forward voltage drop that is an order of magnitude better than a Schottkey diode. The MAX6864 (a nanopower μP supervisory circuit with manual reset and a watchdog timer) is used to monitor the 3.3V supply voltage and reset the microcontroller if it drops below 3.1V. The design also contains an FTDI FT234 USB-to-serial UART interface and a STMicroelectronics® STM32L432KC low-power microcontroller.


Designed, Built, Tested

Board pictured here has been fully assembled and tested. Not available for sale.



PCB Layout

Test Results

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX30101 High-Sensitivity Pulse Oximeter and Heart-Rate Sensor for Wearable Health Signal Integrity Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
Signal Integrity
High-Sensitivity Pulse Oximeter and Heart-Rate Sensor for Wearable Health

Design Files (4)

Title Type Size Date
maxrefdes1044-test-results PDF 384KB 2019-03-11
maxrefdes1044-schematic PDF 31KB 2019-03-11
maxrefdes1044-pcb PDF 2MB 2019-03-11
maxrefdes1044-bom PDF 48KB 2019-03-11
Date Type


(PDF, 384KB)



(PDF, 31KB)



(PDF, 2MB)



(PDF, 48KB)

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