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On the Go Vital Monitoring and Gaming Platform

January 12, 2021

Astha Adhikari  By: Astha Adhikari
 Intern, Multi-Function Power, Battery Power Solutions BU; Maxim Integrated 

The word "classic", in terms of games, resonates to everyone. To Bob Willson, Director, IC Design, Battery Power Solutions BU, it was spending his paper-route money to buy MicroVision's Blockbuster. To me, it is the fond memories associated with fighting with my elder sister over who gets to play the next round of Jardinanins! in our Windows 98 PC. What Bob and I have in common is that we were both hooked on games derived from Atari breakout, where the objective is to hit the bricks using a ball that bounces off a paddle. I incorporated these memories when designing my summer project as an intern at Maxim Integrated. My project is a demo that is "on the go" gaming platform featuring Maxim's low power SIMO PMIC, an m5 FG, and sensors. It is a platform where you can track your vitals or play a classic brick breaker game.

Robert Willson with his paper-route bicycle Robert Willson with his paper-route bicycle

Astha(right) with her sister Anna(left) showing off their trophies in NepalAstha (right) with her sister Anna (left) showing off their trophies in Nepal

The prototype is targeted towards smart wearables in gaming, fitness, and healthcare industries. In addition to powering the next generation gadgets, these are existing technology fueling the current lockdown lifestyle that we are all facing. This project was created keeping the current "social distancing" world in mind. We stayed away from making it a wearable as we wanted it to be something that can be handheld and shown to multiple people. With this product, you can measure temperature, heart rate and blood oxygen level. A pulse oximeter and temperature sensors play key roles in tracking vitals to identify possible COVID-19 symptoms which makes it even more relevant to the current world. The reference design shown below provides an overview of my project.

This project itself is built to highlight the small solution size, high efficiency, and low ripple features of MAX77654 which are critical for customers when making a design decision for their power circuitry. Bob Willson, the IC designer for the first SIMO describes MAX77654 as:

Maxim's second-generation Single Inductor Multiple Output PMIC (SIMO). This product can support 3 output rails with high efficiency from a single inductor, saving board space and BOM cost. Also available on the MAX77654 is a Linear Li+ Power Path battery charger, 2 Linear Drop Output (LDO) regulators, plus multiple GPIO's and an I2C interface for custom configuration settings. Even with all this capability and resources, the MAX77654 only draws 6µA of total quiescent supply current. The MAX77654 provides a complete low power PMIC solution for a wide range of portable applications demanding high performance, low power and long battery life, a great choice for our 'on the go' brick breaker game!

The demo product uses the MAX32630FTHR board stacked with an LCD display along with the sensors attached to it. The LCD board is for a classic brick breaker game that can be played using the onboard joystick controller. One cool thing about the feather board is that it comes with bunch of features including Bluetooth. This board was chosen due to the ease of use of the feather board with other Maxim IC's from different business units.

The MAXM86161 is the heart rate and blood oximeter sensor from the Industrial BU. It meets the industry's lowest ripple specification while being ultra-low power and completely integrated. The MAX17055 fuel gauge, the industry's most accurate fuel gauge from the Battery Power Solutions BU, demonstrates the PMIC's high efficiency by monitoring its battery health. The fuel gauge uses m5 EZ algorithm and has a low operating current of 7uA. It provides the best state of charge with the smallest solution size. The MAX30208 was chosen due to its clinical grade (human body) temperature measurement accuracy.

The final goal is to get the product on global storefront. The product can be useful in tracking our vitals and keeping us updated about our health. It can also be used to entertain our lockdown lifestyle and remind us of our childhood memories related to playing arcade games.

Reference design showing SIMO PMIC powering multiple noise sensitive sensors, micro-controller, and display Reference design showing SIMO PMIC powering multiple noise sensitive sensors, micro-controller, and display.