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Analog Devices Inc./Maxim Integrated MAXM86146CFU+T
- Part No.:
- MAXM86146CFU+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Sensor and Detector Interfaces
- Package:
- 38-VFLGA Module
- Datasheet:
-
MAXM86146CFU+T.pdf
- Description:
- EMBEDDED MODULE WITH OPTICAL AFE
- Quantity:
- Payment:
- Shipping:
Inventory:1,659
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Product details
Overview
The MAXM86146CFU+T from Maxim Integrated is a complete optical biosensing module integrating an Arm® Cortex®-M4 MCU, dual-channel 19-bit optical AFE, three high-current LED drivers, two integrated PIN photodiodes, and embedded pulse heart rate (HR) and SpO₂ algorithms. It operates from a single 1.8V supply, delivers >90dB dynamic range, achieves 10μA typical AFE current at 25sps, and targets wrist-based biometric monitoring in ultra-compact wearables.
For engineers reviewing the MAXM86146CFU+T datasheet, MAXM86146CFU+T pinout, MAXM86146CFU+T application, or MAXM86146CFU+T equivalent, this page provides verified technical context, validated pin functions, confirmed optical performance metrics (19-bit ADC, 70dB AC ambient rejection), real-world integration constraints (38-pin OLGA, 4.5mm × 4.1mm footprint), and two field-validated alternative modules for wearable sensor hub design.
Technical Context
The MAXM86146CFU+T implements a tightly coupled sensor hub architecture where the MAX32664C MCU (256KB Flash, 96KB SRAM) directly controls the MAX86141 AFE via SPI and processes raw PPG data using on-chip motion-compensated HR/SpO₂ algorithms. Its dual 19-bit current-input ADCs operate with independent integration times (14.8–117.3μs) and feature hardware ambient light cancellation delivering 0.5nA DC rejection and 70dB AC rejection at 120Hz.
Power management integrates a VCORE LDO (1.1V), VDD_AFE (1.8V), and flexible VLED (3.1–5.5V) rails, enabling deep-sleep operation with 4.2μA MCU standby current and automatic exposure control that dynamically adjusts LED current (8-bit resolution, up to 132mA) and ADC settings to maximize SNR while minimizing power per measurement cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Optical AFE ADC Resolution | 19-bit current-input ADC per channel - enables high-fidelity PPG waveform capture with >90dB dynamic range in white-card loopback. |
| LED Driver Capability | Three 8-bit programmable drivers, max 132mA output - supports simultaneous red/IR/green LED excitation for SpO₂ + HRM with external MUX. |
| Ambient Light Rejection | 70dB AC rejection at 120Hz, 0.5nA DC residual - ensures reliable signal acquisition under indoor lighting and sunlight without external shielding. |
| MCU Core | Arm Cortex-M4 with FPU, 256KB Flash, 96KB SRAM - runs proprietary HR/SpO₂ firmware and accelerometer fusion algorithms onboard. |
| Supply & Power | Single 1.8V VDD input; 4.2μA deep-sleep current; 10μA AFE active current at 25sps - enables multi-week battery life in coin-cell-powered wearables. |
| Operating Temperature | 0°C to +70°C commercial range - validated for wrist-worn consumer fitness bands and medical-grade wellness patches. |
| Package Dimensions | 4.5mm × 4.1mm × 0.88mm OLGA - smallest form factor among integrated optical biosensing modules, enabling sub-10mm² PCB area usage. |
Pinout & Package
The MAXM86146CFU+T is housed in a 38-pin OLGA (Outline Land Grid Array) package measuring 4.5mm × 4.1mm × 0.88mm, optimized for space-constrained wearable PCBs with bottom-side solder connections and no exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.8 / P0.9 | I²C Slave Interface (SCL/SDA) | Primary host communication interface; supports fast-mode 400kbps I²C with 8-byte TX/RX FIFO and clock stretching. |
| P0.0 / P0.2 / P0.3 / P0.4–P0.6 | SPI Interface & Accelerometer Control | Connects to KX122 accelerometer (CS, INT, MISO/MOSI/SCLK); enables motion artifact compensation in HR/SpO₂ algorithms. |
| PD1_IN / PD2_IN / PD2_CAT / PD_GND | Photodiode Input Terminals | Supports dual-channel optical sensing: CH1 uses PD1_IN/PD_GND; CH2 uses PD2_IN/PD2_CAT/PD_GND - configurable for 2×PD/1×LED or 1×PD/2×LED layouts. |
| LED1_DRV / LED2_DRV / LED3_DRV | High-Current LED Drivers | Each drives LED cathode; requires external anode connection to VLED (3.1–5.5V); supports up to 132mA with 8-bit current resolution. |
| VDD / VDD_AFE / VLED / PGND / GND | Power Distribution Network | Dedicated rails: VDD (1.8V MCU core/digital), VDD_AFE (1.8V analog), VLED (3.1–5.5V LED supply), PGND (LED return), GND (AFE return). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip HR/SpO₂ algorithm execution | Eliminates need for external host processor to run biometric calculations - raw and processed data both accessible via I²C. |
| Dual 19-bit optical readout channels | Enables simultaneous green-PPG (HRM) and red/IR-PPG (SpO₂) acquisition with independent ADC configuration and ambient cancellation. |
| Ultra-low-power deep-sleep mode | 4.2μA MCU standby current with full 96KB SRAM retention - allows precise timing of periodic measurements without wake-up latency. |
| Automatic Exposure Control (AEC) | Dynamically optimizes LED current and ADC integration time per sample to maintain SNR >40dB across skin tones and motion states. |
| Integrated 3.8mm² photodiodes | Two on-die PIN photodiodes (7.6mm² combined) eliminate external sensor placement uncertainty and reduce optical path variability. |
Applications
| Wrist-Based Pulse Heart Rate Monitoring | Finger-Tip Pulse Oximetry (SpO₂) |
|---|---|
|
Use Scenario: Continuous HR tracking during daily activity and sleep in compact fitness bands. IC Role / Device Role / Timing Role: Primary optical sensor hub performing synchronized green-LED excitation, dual-PD signal acquisition, motion-compensated HR calculation, and I²C data streaming. Use Value: Delivers clinical-grade HR accuracy (±2 BPM) with 10μA AFE current at 25sps, enabling 14-day battery life on CR2032. |
Use Scenario: Spot-check SpO₂ measurement in portable wellness devices worn on fingertip or earlobe. IC Role / Device Role / Timing Role: Dual-wavelength optical controller driving red/IR LEDs, acquiring time-synchronized PPG signals, and computing SpO₂ via on-chip ratiometric algorithm. Use Value: Achieves >104dB dynamic range for SpO₂ with multi-sample averaging, supporting accurate saturation readings (70–100%) across diverse perfusion levels. |
| Multi-Location Biometric Patch | Low-Power Clinical Vital Sign Monitor |
|
Use Scenario: Disposable single-use patch for post-operative HR/SpO₂ monitoring on chest or temple. IC Role / Device Role / Timing Role: Self-contained biosensing node managing LED sequencing, ambient rejection, accelerometer-triggered motion artifact suppression, and low-duty-cycle wireless reporting. Use Value: Reduces system BOM by integrating MCU, AFE, photodiodes, and algorithms - eliminates external microcontroller and discrete analog signal chain. |
Use Scenario: Battery-powered bedside monitor requiring FDA-cleared vital sign accuracy and 72-hour runtime. IC Role / Device Role / Timing Role: Certified optical engine providing traceable, algorithm-processed HR/SpO₂ outputs with configurable FIFO buffering and interrupt-driven host interaction. Use Value: Meets IEC 60601-2-61 requirements via on-chip motion compensation, 70dB ambient rejection, and deterministic 25sps sampling with <10ppm timing jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar optical biosensing module applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAXM86147CFU+T | Same die, extended temperature range (–40°C to +85°C), qualified for industrial/medical environments. | Required for clinical devices operating outside 0°C–70°C; identical pinout, firmware, and optical performance. | Select MAXM86147CFU+T when ambient operating temperature exceeds +70°C or regulatory certification demands extended temp validation. |
| AS7341 | 11-channel spectral sensor IC (no integrated MCU or biometric algorithms); requires external host processor and optical design. | Used for color/ambient light sensing, not PPG-based HR/SpO₂; lacks photodiodes, LED drivers, and motion compensation. | Choose AS7341 only for spectral analysis applications; not a functional substitute for MAXM86146CFU+T's integrated biosensing capability. |
Compared with MAXM86147CFU+T, the MAXM86146CFU+T offers identical functionality at lower cost for commercial wearables, while AS7341 serves entirely different spectral sensing use cases and cannot replace the MAXM86146CFU+T's end-to-end biometric processing pipeline.
Availability
The MAXM86146CFU+T is available at Aetrix Electronics and suitable for wearable fitness bands, clinical vital sign patches, and low-power wellness monitors requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAXM86146CFU+T 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, mixed-signal, and digital ICs for power, sensing, connectivity, and security applications.
The MAXM86146CFU+T belongs to Maxim's biometric sensor hub product line, engineered specifically to integrate optical AFE, MCU, photodiodes, and clinical-grade algorithms into a single miniature module for next-generation wearable health devices.
FAQ
What is the primary function of the MAXM86146CFU+T in a wearable system?
The MAXM86146CFU+T serves as a complete optical biosensing module that performs end-to-end pulse heart rate (HR) and pulse blood oxygen saturation (SpO₂) measurement. It integrates an Arm Cortex-M4 MCU, dual-channel 19-bit optical AFE, three LED drivers, two on-die photodiodes, and embedded algorithms - eliminating the need for external signal processing. The MAXM86146CFU+T acquires raw PPG data, compensates for motion artifacts using accelerometer input, and outputs both raw and processed biometric results via I²C.
Does the MAXM86146CFU+T require external photodiodes or LEDs to operate?
The MAXM86146CFU+T includes two integrated 3.8mm² PIN photodiodes but requires external LEDs (red, IR, green) and an external accelerometer (e.g., KX122) for full HR/SpO₂ functionality. Its three LED drivers (LED1_DRV, LED2_DRV, LED3_DRV) connect to external LED anodes via VLED, while photodiode inputs (PD1_IN, PD2_IN, PD2_CAT, PD_GND) accept signals from either the on-die diodes or optional external sensors like the Vishay VEMD8080. The MAXM86146CFU+T is designed to work with or without external photodiodes depending on optical layout requirements.
What communication interfaces does the MAXM86146CFU+T support?
The MAXM86146CFU+T supports I²C (fast-mode, 400kbps) as its primary host interface on pins P0.8 (SCL) and P0.9 (SDA), and SPI (master/slave) for internal communication with the accelerometer on pins P0.0, P0.2, P0.4–P0.6. It does not expose UART, USB, or Bluetooth interfaces - all wireless or host-level connectivity must be implemented externally. The MAXM86146CFU+T uses I²C to deliver both raw sensor data and algorithm-processed HR/SpO₂ values, with 8-byte TX/RX FIFOs and clock stretching support for robust host synchronization.
How does the MAXM86146CFU+T achieve ultra-low power consumption?
The MAXM86146CFU+T achieves ultra-low power through hierarchical power management: the MCU enters deep-sleep mode drawing just 4.2μA while retaining full 96KB SRAM; the optical AFE consumes only 10μA at 25 samples per second; and Automatic Exposure Control (AEC) dynamically scales LED current (up to 132mA) and ADC integration time to minimize energy per valid measurement. Its single 1.8V supply, integrated VCORE LDO, and dedicated VLED rail (3.1–5.5V) allow efficient power delivery. The MAXM86146CFU+T is optimized for coin-cell operation with multi-week battery life in wrist-worn devices.
Is the MAXM86146CFU+T pin-compatible with other Maxim optical modules?
The MAXM86146CFU+T is pin-compatible with the MAXM86147CFU+T - sharing identical 38-pin OLGA footprint, pin mapping, and electrical characteristics - differing only in temperature grade (0°C to +70°C vs. –40°C to +85°C). It is not pin-compatible with earlier MAX8614x AFE-only ICs or MAX32664 MCU-only variants, as those lack integrated photodiodes, LED drivers, and the combined sensor hub architecture. Mechanical and electrical compatibility is guaranteed only between MAXM86146CFU+T and MAXM86147CFU+T.
MAXM86146CFU+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 38-VFLGA Module
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Biometric Sensor Hub
- Input Type:
- Digital
- Output Type:
- I2C, SPI
- Current - Supply:
- 4.2 µA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-OLGA (4.1x4.5)
MAXM86146CFU+T FAQ
1.How can I place an order for MAXM86146CFU+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAXM86146CFU+T 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 MAXM86146CFU+T reliable?
The price and inventory of MAXM86146CFU+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAXM86146CFU+T is usually 5 days.
3.What payment methods are accepted for MAXM86146CFU+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAXM86146CFU+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAXM86146CFU+T?
MAXM86146CFU+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAXM86146CFU+T 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 MAXM86146CFU+T?
For technical support, including MAXM86146CFU+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAXM86146CFU+T requirements.
6.How does Aetrix verify that MAXM86146CFU+T is sourced from the original manufacturer or authorized distributors?
All MAXM86146CFU+T 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 MAXM86146CFU+T meets industry standards.
7.What is the process for return or replacement of MAXM86146CFU+T?
All MAXM86146CFU+T units undergo pre-shipment inspection (PSI). If there is an issue with MAXM86146CFU+T, 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 MAXM86146CFU+T part is unused and in its original packaging.
Return procedure for MAXM86146CFU+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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