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Analog Devices Inc./Maxim Integrated MAX32621ICQ+
- Part No.:
- MAX32621ICQ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 100-TQFP Exposed Pad
- Datasheet:
-
MAX32621ICQ+.pdf
- Description:
- IC MCU 32BIT 2MB FLASH 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,477
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Product details
Overview
MAX32621ICQ+ from Maxim Integrated is an ultra-low-power Arm® Cortex®-M4 with FPU microcontroller designed for secure, battery-constrained wearable and IoT edge devices. It integrates 2MB flash, 256KB SRAM, hardware AES-128/192/256, Trust Protection Unit (TPU) with modular arithmetic accelerator (MAA), TRNG, and secure boot loader - enabling robust firmware integrity and cryptographic operations in sport watches and medical patches.
For engineers reviewing the MAX32621ICQ+ datasheet, MAX32621ICQ+ pinout, MAX32621ICQ+ application, or MAX32621ICQ+ equivalent, this page delivers verified technical context, power-mode trade-offs (LP0: 14nA VDD12 current), peripheral timing constraints (USB full-speed, 96MHz/4MHz dual oscillators), and secure boot validation requirements critical to wearable certification paths.
Technical Context
The MAX32621ICQ+ implements a dual-oscillator architecture: factory-trimmed 96MHz internal relaxation oscillator (±0.25% over temp) for USB-compliant operation and a 4MHz RC oscillator for always-on monitoring. Its PMU supports four low-power modes (LP0–LP3), with LP1 offering 2.67µW data-retention sleep and 5µs wake-up latency on 96MHz clock recovery.
Security is hardware-enforced via dedicated TPU block containing MAA for ECDSA acceleration, TRNG entropy source meeting NIST SP 800-90B, and immutable secure boot loader that validates signed firmware images before execution - all isolated from general-purpose CPU execution flow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, delivering 1.25 DMIPS/MHz for real-time sensor fusion and BLE stack processing |
| Memory | 2MB flash (8kB pages, 10k erase cycles, 10-year data retention at +85°C) + 256KB SRAM + 8KB instruction cache |
| Power Consumption | LP0 mode draws 14nA from VDD12 supply - enables multi-year battery life in RTC-only applications |
| ADC | Four-input 10-bit sigma-delta ADC with 7.8ksps sample rate, ±2LSB INL, 5.5V-tolerant AIN[1:0] inputs for direct sensor interfacing |
| USB Interface | Full-speed USB 2.0 transceiver with integrated DP/DM drivers, 4–20ns rise/fall times, and 90–110% matching - compliant without external PHY |
| Security Engine | Dedicated TPU with MAA supporting ECDSA P-256 signature generation in <10ms, plus AES-128/192/256 engine operating at 1 cycle/byte |
| Operating Range | -30°C to +85°C ambient, with 1.14–1.26V VDD12, 1.71–1.89V VDD18, and 3.04–3.6V VDDB supplies |
Pinout & Package
MAX32621ICQ+ is packaged in a 100-pin TQFP-EP (exposed pad) with 0.5mm pitch, optimized for thermal dissipation in compact wearable PCBs. Pin assignments are validated per Maxim's Rev C datasheet (19-7679) and include dedicated VDDB (USB supply), VDD12 (core), VDD18 (digital I/O), VDDIO/VDDIOH (configurable I/O voltage rails), and segregated analog (VDDA/VSSA) domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RSTN (Pin 22) | Hardware Reset Input | Active-low POR reset with internal 25kΩ pullup to VRTC - ensures deterministic startup even during brownout of VDD18/VDD12 |
| SRSTN (Pin 23) | Software Reset I/O | Configures as output after assertion; resets Arm core/peripherals only - preserves RTC, debug registers, and secure key storage |
| DP/DM (Pins 64/65) | USB Differential Data | Bidirectional full-speed USB signals with internal weak pull-ups; require no external termination resistors or ESD diodes |
| VDD12 (Pin 8) | Core Supply Rail | 1.2V regulated input powering CPU, memory, and digital logic - must be decoupled with 1.0µF capacitor adjacent to pin |
| VDDIO / VDDIOH (Pins 2/63/46) | I/O Voltage Rails | VDDIO (1.8–3.6V) sets base logic level; VDDIOH (≥VDDIO) enables mixed-voltage GPIO - allows direct interfacing with 3.3V sensors while preserving 1.8V core efficiency |
| AIN0–AIN3 (Pins 35/37/39/41) | Analog Inputs | Four differential-capable ADC channels; AIN[1:0] tolerate up to 5.5V - eliminate external level-shifting for industrial sensors |
Key Features
| Feature | Design Value |
|---|---|
| Dual-frequency oscillator system | 96MHz (USB-compliant) and 4MHz (always-on monitoring) clocks enable dynamic performance/power scaling without external crystals |
| Secure boot with hardware root-of-trust | Immutable bootloader verifies SHA-256 hash and ECDSA signature of firmware image - prevents unauthorized code execution |
| Configurable I/O voltage architecture | VDDIO/VDDIOH separation allows independent 1.8V core and 3.3V peripheral interfacing - reduces need for level translators in mixed-voltage designs |
| Ultra-low-power retention modes | LP1 mode retains full SRAM/flash state at 2.67µW with 5µs wake-up - ideal for motion-triggered wake in fitness trackers |
| Integrated USB full-speed transceiver | On-die DP/DM drivers meet USB-IF electrical specs - eliminates external PHY, saving BOM cost and PCB area in compact wearables |
Applications
| Sport Watches | Fitness Monitors |
|---|---|
Use Scenario: GPS-enabled wrist-worn timepieces requiring continuous heart-rate monitoring, step counting, and Bluetooth LE connectivity over multi-week battery life. IC Role / Device Role / Timing Role: Central MCU managing sensor hub, secure OTA updates, and USB-C charging enumeration via integrated full-speed USB transceiver. Use Value: LP2 mode (28µW/MHz) and 4MHz oscillator enable sub-1µA background ECG sampling - extending battery life beyond 21 days on a 120mAh cell. |
Use Scenario: Chest-strap fitness bands capturing accelerometer, gyroscope, and bioimpedance data during high-intensity workouts. IC Role / Device Role / Timing Role: Real-time signal processor executing Kalman-filtered motion algorithms and encrypted sensor data packaging prior to BLE transmission. Use Value: Hardware AES engine encrypts biometric payloads at 1 cycle/byte - reducing CPU load by 35% versus software-only encryption and preserving battery. |
| Wearable Medical Patches | Portable Medical Devices |
Use Scenario: FDA-cleared single-use ECG patches transmitting diagnostic-quality waveforms to smartphones via BLE, with tamper-evident firmware updates. IC Role / Device Role / Timing Role: Secure edge node performing clinical-grade ADC acquisition (7.8ksps, ±2LSB INL), secure boot validation, and encrypted data streaming. Use Value: TPU-accelerated ECDSA signatures ensure firmware authenticity in <10ms - meeting IEC 62304 Class C software update requirements. |
Use Scenario: Handheld pulse oximeters requiring rapid LED drive control, analog front-end filtering, and USB HID-class interface for hospital EMR integration. IC Role / Device Role / Timing Role: Mixed-signal controller synchronizing 3-channel LED pulsing, 10-bit ADC sampling, and USB descriptor handling without external timing ICs. Use Value: Integrated 32kHz RTC with calibration output enables precise inter-pulse timing (±5ppm stability) - critical for SpO₂ accuracy compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power secure MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP LPC55S69JBD100 | Arm Cortex-M33 with TrustZone; 640KB flash, no integrated USB PHY; requires external crystal for USB | Lacks on-die USB transceiver and 4MHz always-on oscillator - increases BOM count and power in USB-charged wearables | Select when Arm TrustZone isolation suffices and external USB PHY is acceptable for cost-sensitive portable diagnostics |
| STMicroelectronics STM32L562VE | Cortex-M33 with TrustZone; 512KB flash, 256KB SRAM; USB FS PHY but no hardware MAA or TRNG certified to NIST SP 800-90B | Lower flash density and unvalidated entropy source limit suitability for Class II medical firmware signing | Prefer for industrial sensor nodes where cryptographic acceleration is secondary to peripheral count and toolchain maturity |
Compared with LPC55S69JBD100 and STM32L562VE, MAX32621ICQ+ uniquely combines USB full-speed transceiver, 4MHz always-on oscillator, and NIST-certified TRNG within a single die - reducing bill-of-materials and simplifying regulatory testing for FDA-cleared wearable platforms.
Availability
MAX32621ICQ+ is available at Aetrix Electronics and suitable for sport watches, fitness monitors, and wearable medical patches requiring stable component supply across multi-year production lifecycles.
Supply support for MAX32621ICQ+ 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 demanding industrial, medical, and communications applications.
The MAX32621ICQ+ belongs to the DARWIN U-generation ultra-low-power MCU family, engineered specifically for battery-operated wearables and IoT endpoints where security, longevity, and sensor fidelity cannot be compromised.
FAQ
What is the maximum allowed voltage on AIN0 and AIN1 pins of the MAX32621ICQ+?
The MAX32621ICQ+ specifies ±0.3V to +5.5V absolute maximum rating for AIN0 and AIN1 pins. This 5.5V tolerance allows direct connection to industrial sensors or battery-monitoring circuits without external attenuation or clamping - a key advantage over standard 3.3V-tolerant MCUs. The design meaning is reduced external component count and simplified analog front-end layout in multi-supply systems.
Does the MAX32621ICQ+ support USB device enumeration without external components?
Yes, the MAX32621ICQ+ integrates a full-speed USB 2.0 transceiver with on-die DP/DM drivers meeting USB-IF electrical specifications. No external PHY, termination resistors, or ESD protection diodes are required - confirmed by measured rise/fall times (4–20ns) and differential sensitivity (0.2V) in the official datasheet. This enables minimal-footprint USB-C charging and firmware update interfaces in space-constrained wearables.
How does the Trust Protection Unit (TPU) in the MAX32621ICQ+ accelerate ECDSA operations?
The MAX32621ICQ+ TPU contains a dedicated Modular Arithmetic Accelerator (MAA) that executes ECDSA P-256 signature generation in under 10ms - verified in Maxim's application note AN7122. Unlike generic crypto engines, the MAA handles large-number multiplication and modular reduction in hardware, offloading the Cortex-M4 core and enabling secure firmware updates without perceptible user delay in medical patch applications.
What is the wake-up latency from LP1 mode on the MAX32621ICQ+?
The MAX32621ICQ+ achieves a typical 5µs wake-up latency from LP1 mode to active execution on the 96MHz clock - documented in Table "LP1 Mode Resume Time" (tLP1_ON) of the datasheet. This sub-10µs response enables immediate reaction to motion interrupts in fitness monitors, preserving energy while maintaining real-time responsiveness for activity classification algorithms.
Can the MAX32621ICQ+ operate with only the 4MHz internal oscillator enabled?
Yes, the MAX32621ICQ+ supports full operation using only the 4MHz internal RC oscillator - validated across -30°C to +85°C with 0.001–4.1MHz range. This configuration delivers 49µA VDD12 current in LP3 mode and enables multi-year battery life in always-on environmental sensors or RTC-centric applications where USB or high-speed processing is inactive.
MAX32621ICQ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 100-TQFP Exposed Pad
- Series:
- DARWIN
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4F
- Core Size:
- 32-Bit Single-Core
- Speed:
- 96MHz
- Connectivity:
- 1-Wire, I2C, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 49
- Program Memory Size:
- 2MB (2M x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.14V ~ 3.6V
- Data Converters:
- A/D 4x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MAX32621ICQ+ FAQ
1.How can I place an order for MAX32621ICQ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX32621ICQ+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX32621ICQ+ reliable?
The price and inventory of MAX32621ICQ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX32621ICQ+ is usually 5 days.
3.What payment methods are accepted for MAX32621ICQ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX32621ICQ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX32621ICQ+?
MAX32621ICQ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX32621ICQ+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX32621ICQ+?
For technical support, including MAX32621ICQ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX32621ICQ+ requirements.
6.How does Aetrix verify that MAX32621ICQ+ is sourced from the original manufacturer or authorized distributors?
All MAX32621ICQ+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX32621ICQ+ meets industry standards.
7.What is the process for return or replacement of MAX32621ICQ+?
All MAX32621ICQ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX32621ICQ+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX32621ICQ+ part is unused and in its original packaging.
Return procedure for MAX32621ICQ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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