General Description

The MAX32655 microcontroller (MCU) is an advanced

system-on-chip (SoC) featuring an Arm® Cortex®-M4F

CPU for efficient computation of complex functions and

algorithms that is qualified to operate at a temperature

range of -40°C to +105°C. The SoC integrates power regulation and management with a single inductor multipleoutput (SIMO) buck regulator system. The latest generation Bluetooth® 5.2 Low Energy (LE) radio is on board,

supporting long-range (coded) and high-throughput

modes and medical body area network (MBAN).

The device offers large onboard memory with 512KB flash

and 128KB SRAM, with optional error correction coding

(ECC) on one 32KB SRAM bank. This 32KB bank can be

optionally retained in BACKUP mode. An 8KB user OTP

area is available.

The MAX32655 supports multiple high-speed peripherals,

such as I2C, 50MHz SPI, and UART, plus one I2S port

for connecting to an audio codec. An eight-input, 10-bit

ADC is available to monitor analog input from external

analog sources. In addition, a low-power UART (LPUART)

is available for operation in the lowest power sleep modes

to facilitate wake-up activity without any data loss. A total

of six timers with I/O capability are provided, including two

low-power timers to enable pulse counting, capture/compare, and pulse-width modulation (PWM) generation, even

in the lowest power sleep modes.

The MAX32655 is available in two different packages:

● 81 CTBGA (8mm x 8mm, 0.8mm pitch)

● 51 WLP (3.09mm x 3.09mm, 0.35mm pitch)

Applications

● Asset Tracking

● Fitness/Health and Medical Wearables

● Hearables

● Industrial Sensors

● Wireless Computer Peripherals and I/O Devices

Benefits and Features

● Ultra-Low-Power Wireless Microcontroller

• Internal 100MHz Oscillator

• Flexible Low-Power Modes with 7.3728MHz

System Clock Option

• 512KB Flash and 128KB SRAM

• Optional ECC on One 32KB SRAM Bank

• 16KB Instruction Cache

● Bluetooth 5.2 LE Radio

• Dedicated, Ultra-Low-Power, 32-Bit RISC-V

Coprocessor to Offload Timing-Critical Bluetooth

Processing

• Fully Open-Source Bluetooth 5.2 Stack Available

• Supports Medical Body Area Network (MBAN)

• High-Throughput (2Mbps) Mode

• Long-Range (125kbps and 500kbps) Modes

• Rx Sensitivity: -97dBm; Tx Power: +5.5dBm

• Single-Ended Antenna Connection (50Ω)

● Power Management Maximizes Battery Life

• 2.0V to 3.6V Supply Voltage Range

• Integrated SIMO Power Regulator

• 12.9μA/MHz Active Current at 3.0V

• 1.53μA at 3.0V Retention Current for 32KB

• Selectable SRAM Retention + RTC in Low-Power

Modes

● Multiple Peripherals for System Control

• Up to Two High-Speed SPI Controller/Target

• Up to Three I2C Controller/Target

• Up to Four UARTs

• Up to One I2S Controller/Target

• Up to 8-Input, 10-Bit Sigma-Delta ADC 7.8ksps

• Up to Four Micro-Power Comparators

• Timers: Four 32-Bit, Two Low Power, One

Watchdog, One Low-Power Watchdog

• 1-Wire® Controller

• Up to Four Pulse Train (PWM) Engines

• RTC with Wake-Up Timer

• Up to 52 GPIOs

● Security and Integrity

• Optional Secure Boot

• TRNG Seed Generator

• AES 128/192/256 Hardware Acceleration Engine