MAX77651

• Easy to Use
• GUI Drives I²C Interface
• On-Board Ammeter
• On-Board Thermistor
• On-Key Options
• RGB LED Cluster
• Assembled and Fully Tested
• Emulates System Loading
• On-Board Electronic Loads
• Electronic Loads have steady-state, transient, and random modes
• Demonstrates End-to-End Analog Multiplexer Implementation
• On-Board ADC
• Evaluates Both Push-Button and Slider-Switch On-Key Options

The MAX77650/MAX77651 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77650/MAX77651. The EV kit allows for easy evaluation of the various MAX77650/MAX77651 features, including the SIMO buck-boost regulator, linear regulator, analog multiplexer, smart battery charger, on/off controller, and I²C interface.

The MAX77650 and MAX77651 EV kits are identical aside from the device (U1), silkscreen, and two resistive dividers at the SIMO outputs (see the MAX77650/MAX77651 EV Kit Differences section). The MAX77650/MAX77651 devices themselves have different output voltage ranges for the SIMO buck-boost regulator. Consult the device data sheet for more information.

Windows^®-based software provides a user-friendly graphical interface as well as a detailed register-based interface to exercise the features of the MAX77650/MAX77651.

Applications

• Bluetooth Headphones/Hearables
• Fitness, Health, and Activity Monitors
• Internet of Things (IoT)
• Portable Devices

• Convenient Development Platform
  • 0.9in x 2.0in DIP Form Factor
  • Breadboard Compatible
  • Feather Wing Compatible
  • Pmod-Compatible Sockets
    • Supports SPI, UART, I²C, and GPIO
    • Accessible from Both Sides of Board
  • Integrated Battery Management
    • Single-Cell Li+ Charger
    • Fuel Gauge
  • User Interface Peripherals
    • Two RGB LEDs
    • Two Pushbuttons
• MAX32620 Microcontroller Features
  • 96MHz Arm Cortex-M4 Microcontroller with FPU
  • 2048KB Flash
  • 256KB SRAM
  • Full-Speed USB
  • SPI, I²C, UART, and 1-Wire
  • 4-Channel 10-Bit ADC
  • 49 Dual Voltage GPIO
  • 3.9mm x 4.1mm, 81-Bump WLP
• MAX77650 Ultra-Low Power PMIC Features
  • Smart Power Selector Charger
    • Supports Li+/Li-Poly Batteries
    • 7.5mA to 300mA Charge Current
  • Single Inductor Multiple Output (SIMO) Buck-Boost Regulator
    • 3 Outputs from a Single Inductor
  • 150mA LDO Regulator
  • I²C Configurable
  • 2.75mm x 2.15mm, 30-Bump WLP
• MAX17055 Fuel Gauge Features
  • ModelGauge m5 EZ
    • Eliminates Battery Characterization
    • Eliminates Coulomb Counter Drift
  • 7µA Operating Current
  • 1.4mm x 1.5mm, 9-Bump WLP

The MAX32620FTHR board is a rapid development platform designed to help engineers quickly implement battery-optimized solutions with the MAX32620 Arm^® Cortex^®-M4 microcontroller with FPU. The board also includes the MAX77650 ultra-low power PMIC and MAX17055 fuel gauge to provide efficient power conversion and battery management with minimal board space. The form factor is a small 0.9in x 2.0in dual-row header footprint that is compatible with breadboards and off-theshelf peripheral expansion boards. In addition to the dualrow headers, there are also two 12-pin Pmod™-compatible socket connectors for more expansion options. Also on board are common user-interface peripherals including two RGB indicator LEDs and two pushbuttons. These provide a power-optimized flexible platform for quick proofs-of-concept and early software development to enhance time to market.

Applications

• Fitness Monitors
• Portable Medical Devices
• Sensor Hub
• Sport Watches
• Wearable Medical Patches

• Easy to Use
• GUI Drives I²C Interface
• On-Board Ammeter
• On-Board Thermistor
• On-Key Options
• RGB LED Cluster
• Assembled and Fully Tested
• Emulates System Loading
• On-Board Electronic Loads
• Electronic Loads have steady-state, transient, and random modes
• Demonstrates End-to-End Analog Multiplexer Implementation
• On-Board ADC
• Evaluates Both Push-Button and Slider-Switch On-Key Options

The MAX77650/MAX77651 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77650/MAX77651. The EV kit allows for easy evaluation of the various MAX77650/MAX77651 features, including the SIMO buck-boost regulator, linear regulator, analog multiplexer, smart battery charger, on/off controller, and I²C interface.

The MAX77650 and MAX77651 EV kits are identical aside from the device (U1), silkscreen, and two resistive dividers at the SIMO outputs (see the MAX77650/MAX77651 EV Kit Differences section). The MAX77650/MAX77651 devices themselves have different output voltage ranges for the SIMO buck-boost regulator. Consult the device data sheet for more information.

Windows^®-based software provides a user-friendly graphical interface as well as a detailed register-based interface to exercise the features of the MAX77650/MAX77651.

Applications

• Bluetooth Headphones/Hearables
• Fitness, Health, and Activity Monitors
• Internet of Things (IoT)
• Portable Devices

Description

The MAXREFDES1207 is a reference design for wearable application based on a total Analog Devices solution which includes the MAX32660, MAX30112, MAX77651B, and MAX40005. This solution demonstrates how a small size, low cost, low power, high accuracy heart-rate (HR) monitor can be easily implemented. This design can monitor heart rate using two green LEDs.

The MAX30112 is an optimized pulse-oximeter and heartrate AFE for wearable health. It 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 complete optical readout signal chain. With external LED(s) and photodiode(s), the MAX30112 offers the lowest power, highest performance heart-rate detection solution for wrist applications. The MAX77651B provides highly-integrated battery charging and power supply solutions for low-power wearable applications where size and efficiency are critical. The device features a SIMO buckboost regulator that provides three independently programmable power rails from a single inductor to minimize total solution size. A highly configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA). The MAX32660 is an ultra-low-power, cost-effective, highly- integrated microcontroller unit (MCU) designed for battery- powered devices and wireless sensors. It combines a flexible and versatile power management unit with the powerful Arm^® Cortex^®-M4 with floating point unit (FPU). The MAX40005 is a tiny, single comparator which is ideal for a wide variety of portable electronics applications such as cell phones, media players, and notebooks that have extremely tight board space and power constraints. The design also contains an FTDI FT234 USB-to-serial UART interface.