Analog Devices Inc./Maxim Integrated MAX32600-W85B+

Overview

The MAX32600-W85B+ from Maxim Integrated is an ARM Cortex-M3-based wellness measurement microcontroller operating at up to 24MHz, featuring 256KB flash, 32KB SRAM, a 16-bit ADC with PGA (gain 1–8), two 12-bit DACs, four op-amps, and integrated Trust Protection Unit for secure firmware execution. It targets ultra-low-power wearable medical devices requiring precision analog front-end performance and cryptographic integrity.

For engineers reviewing the MAX32600-W85B+ datasheet, MAX32600-W85B+ pinout, MAX32600-W85B+ application, or MAX32600-W85B+ equivalent, key selection considerations include its 108-ball WLP package (5.4mm × 4.3mm), LP1 mode current of 1.8µA with RTC enabled and 15µs wakeup, integrated AFE for pulse oximetry and galvanic skin response, and AES/TRNG/ECDSA hardware acceleration for HIPAA-compliant data handling.

Technical Context

The MAX32600-W85B+ integrates a dual-domain power management unit enabling five low-power modes (LP0–LP3), with LP1 sustaining data retention and real-time clock operation at 1.8µA while supporting sub-15µs wake-up. Its analog subsystem includes a programmable gain amplifier with 8:1 differential or 16:1 single-ended input mux, internal voltage reference (1.024V/1.5V/2.048V), and dedicated bias control for external sensors.

The device implements a hardened Trust Protection Unit with AES-128/256 engine, µMAA for ECDSA/RSA signing, true random number generator, and fast-erase SRAM for secure key storage-designed specifically for FDA-cleared wearable diagnostics where firmware integrity and patient data confidentiality are mandated.

Key Specifications

Pinout & Package

MAX32600-W85B+ uses a 108-ball Wafer-Level Package (WLP), 0.4mm pitch, 5.4mm × 4.3mm footprint, optimized for space-constrained wearable medical designs. Thermal resistance θ_JA = 32.99°C/W on standard 4-layer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wellness measurement microcontroller applications.

Compared with ADuCM3029BBCZ and STM32L4P5VGT6, the MAX32600-W85B+ delivers superior system-level integration for medical wearables-reducing component count by 12+ analog ICs, cutting PCB area by 40%, and providing hardware-rooted security essential for FDA 510(k) submissions.

Availability

MAX32600-W85B+ is available at Aetrix Electronics and suitable for wearable medical devices, pulse oximetry systems, and galvanic skin response monitors requiring stable component supply, long-term lifecycle assurance, and regulatory-compliant traceability.

Supply support for MAX32600-W85B+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for automotive, industrial, and healthcare applications with emphasis on reliability and low-power innovation.

The MAX32600 product line was engineered specifically for battery-powered wellness measurement systems-integrating clinical-grade analog front-ends, ultra-low-power operation, and hardware security to accelerate FDA-cleared wearable development.

FAQ

What is the maximum ADC sampling rate supported by the MAX32600-W85B+?

The MAX32600-W85B+ supports up to 500ksps in PGA bypass mode. When the programmable gain amplifier is enabled, the maximum rate decreases slightly depending on gain setting: 470ksps at gain 1 or 2, 444ksps at gain 4, and 421ksps at gain 8. This performance is specified with VDDA3 = 3.0V and internal reference enabled, making it suitable for high-fidelity photoplethysmography signal capture in pulse oximetry applications.

Does the MAX32600-W85B+ include hardware cryptographic acceleration?

Yes, the MAX32600-W85B+ includes a dedicated Trust Protection Unit with AES-128/256 hardware engine, true random number generator (TRNG), and µMAA coprocessor for ECDSA and RSA operations. These features enable secure boot, firmware authentication, and encrypted data-at-rest-critical for HIPAA and GDPR compliance in wearable health devices using the MAX32600-W85B+.

What package type is used for the MAX32600-W85B+?

The MAX32600-W85B+ uses a 108-ball Wafer-Level Package (WLP) with 0.4mm pitch and 5.4mm × 4.3mm footprint. This ultra-compact package is explicitly designated for the -W85B+ variant and differs from the 120-ball CTBGA (-P85) and 192-ball CTBGA (-T85) variants, enabling miniaturized PCB designs for ear-worn or patch-style medical sensors.

How does the MAX32600-W85B+ achieve ultra-low power consumption in sleep modes?

The MAX32600-W85B+ achieves 1.8µA in LP1 mode (with RTC enabled and SRAM retention) and 1.25µA in LP2 mode through a dual-domain PMU that independently gates clocks and power to digital, analog, and peripheral domains. Its 6-channel DMA engine allows peripherals like the ADC or UART to operate autonomously while the Cortex-M3 core remains powered down-enabling energy-efficient burst sampling in glucose meters and ECG patches.

Can the MAX32600-W85B+ drive LEDs directly for optical sensing applications?

Yes, the MAX32600-W85B+ integrates up to eight 100mA LED driver pairs (sink configuration) with programmable current control, enabling direct driving of red, IR, and green LEDs used in pulse oximetry and heart-rate monitoring. Each driver supports PWM dimming and synchronized timing with ADC sampling-eliminating the need for external LED driver ICs and reducing system power loss by up to 20% compared to discrete solutions.