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Analog Devices Inc./Maxim Integrated MAX9926UAEE/V+T
- Part No.:
- MAX9926UAEE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Sensor and Detector Interfaces
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX9926UAEE/V+T.pdf
- Description:
- IC VR SENSOR INTERFACE 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
MAX9926UAEE/V+T from Maxim Integrated is a dual-channel variable reluctance (VR) sensor interface IC designed for automotive crankshaft and camshaft position/speed sensing. It integrates two matched differential amplifiers (1V/V gain), adaptive peak threshold detection, zero-crossing comparators, and a dedicated rotational direction (DIRN) output. Operates from 4.5V to 5.5V supply over -40°C to +125°C, supporting both differential and legacy single-ended VR sensors in high-noise engine environments.
For engineers reviewing the MAX9926UAEE/V+T datasheet, MAX9926UAEE/V+T pinout, MAX9926UAEE/V+T application, or MAX9926UAEE/V+T equivalent, this page delivers verified functional architecture, automotive-grade thermal and noise-immunity specifications, dual-channel timing accuracy data, DIRN logic behavior, and validated alternatives for crank/cam sensing designs.
Technical Context
The MAX9926UAEE/V+T implements two independent VR signal chains, each comprising a rail-to-rail CMOS-input differential amplifier with integrated 65–135kΩ matched resistors, a precision comparator with <20ns jitter, and configurable adaptive peak/zero-crossing detection. Its dual architecture enables quadrature decoding via synchronized COUT1/COUT2 outputs and DIRN state transitions.
Mode selection (A1/A2/B/C) is controlled by ZERO_EN and INT_THRS pins, enabling internal adaptive threshold (85ms watchdog), external voltage threshold (Mode B), or high-performance differential amplifier + comparator operation (Mode C). All circuitry is qualified for automotive AEC-Q100 Grade 0 (-40°C to +125°C) operation with 771.5mW max power dissipation at +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - Enables direct connection to automotive 5V rail without LDO; supports cold-crank down to 4.5V. |
| Operating Temperature | -40°C to +125°C - Fully specified for under-hood engine control unit (ECU) placement per AEC-Q100. |
| Differential Gain | 1V/V fixed - Eliminates external gain-setting resistors; ensures matched channel performance across temperature. |
| Adaptive Threshold Accuracy | 33% of prior-cycle peak - Dynamically tracks VR signal amplitude decay (e.g., low-RPM cranking), preventing missed teeth. |
| Zero-Crossing Propagation Delay | 50ns - Delivers sub-degree crank angle resolution at 10,000 RPM with minimal phase error. |
| DIRN Output Logic | Open-drain, 0.2V low - Interfaces directly to 3.3V/5V microcontroller GPIO; indicates leading/following edge relationship between COUT1 and COUT2. |
| Input CMRR | 55–78dB - Rejects common-mode noise from ignition systems and alternators without external filtering. |
Pinout & Package
MAX9926UAEE/V+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 1.0mm height) with standard 0.635mm pitch, optimized for automotive PCB layout and thermal management (θJA = 103.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | IN1+, IN1- | Differential input channel 1 - Accepts legacy single-ended or modern differential VR sensor signals; referenced to BIAS1. |
| 2, 15 | IN2+, IN2- | Differential input channel 2 - Enables quadrature decoding when paired with IN1+/IN1-; independent biasing via BIAS2. |
| 3, 13 | BIAS1, BIAS2 | External bias reference inputs - Accept VCC/2 divider (Mode A1/B/C) or connect to GND for internal 2.5V reference (Mode A2). |
| 4, 12 | COUT1, COUT2 | Open-drain comparator outputs - Require 10kΩ pull-up; generate clean digital pulses aligned to gear tooth zero-crossing or adaptive peak. |
| 5 | GND | Analog/digital ground reference - Shared return path for both channels; must be low-impedance plane connection. |
| 6 | ZERO_EN | Zero-crossing enable control - High = enable zero-crossing mode; low = disable (used in Mode C). |
| 7 | DIRN | Rotational direction output - Open-drain; high = COUT1 leads COUT2 (clockwise); low = COUT1 lags COUT2 (counterclockwise). |
| 8, 11 | EXT1, EXT2 | External threshold inputs - Accept user-defined voltage (1.5V to VCC−1.1V) for custom threshold algorithms in Mode B. |
| 9, 10 | INT_THRS1, INT_THRS2 | Internal threshold mode select - Set operating mode (A1/A2/B/C) with voltage levels on ZERO_EN and INT_THRS pins. |
| 14 | VCC | Positive supply input - Must be bypassed with 10nF (closest), 0.1µF, and 1µF ceramic capacitors to suppress charge-pump noise. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent VR channels | Enables simultaneous crankshaft and camshaft sensing or quadrature decoding without external multiplexing or timing alignment. |
| Adaptive peak threshold with 85ms watchdog | Automatically recovers pulse detection after intermittent sensor disconnection or signal dropout, critical for start-stop systems. |
| Configurable zero-crossing detection | Provides true center-of-tooth timing marker with 50ns propagation delay, improving engine timing accuracy vs. peak-based methods. |
| Direction output (DIRN) | Eliminates need for external XOR logic or microcontroller edge-timing analysis in high-performance engines using quadrature VR sensors. |
| Integrated matched resistor network | Guarantees >55dB CMRR across -40°C to +125°C, reducing sensitivity to EMI from ignition coils and fuel injectors. |
Applications
| Camshaft Position Sensing | Crankshaft Position Sensing |
|---|---|
|
Use Scenario: Detecting camshaft rotation phase relative to crankshaft for variable valve timing (VVT) control in gasoline direct injection engines. IC Role / Device Role / Timing Role: Dual-channel interface converting differential VR sensor outputs into synchronized COUT1/COUT2 pulses and DIRN direction flag for ECU phase calculation. Use Value: Enables sub-degree cam phase resolution at 0–8000 RPM using adaptive threshold tracking and zero-crossing alignment, meeting Euro 7 OBD-II timing accuracy requirements. |
Use Scenario: Measuring crankshaft angular position and speed for spark timing, fuel injection, and misfire detection in turbocharged diesel engines. IC Role / Device Role / Timing Role: Primary VR signal conditioner generating robust zero-crossing pulses from weak, noisy flywheel signals during cold cranking (<50mV peak). Use Value: Maintains pulse integrity down to 20mV input amplitude with 33% adaptive threshold scaling, ensuring reliable start-up below −30°C ambient. |
| Transmission Input Speed Sensing | Quadrature-Based Engine Direction Detection |
|
Use Scenario: Monitoring input shaft speed in 8-speed automatic transmissions using legacy single-ended VR sensors mounted near gear trains. IC Role / Device Role / Timing Role: Single-channel VR interface (COUT1 path) with external threshold (Mode B) for adaptive filtering of gear mesh vibration harmonics. Use Value: Reduces false triggering from 1–5kHz mechanical resonance by applying firmware-controlled EXT1 voltage, improving shift quality diagnostics. |
Use Scenario: Determining engine rotation direction during auto-start/stop and regenerative braking in hybrid powertrains. IC Role / Device Role / Timing Role: Quadrature decoder using COUT1, COUT2, and DIRN outputs to unambiguously identify forward/reverse crank rotation without microcontroller interrupt latency. Use Value: DIRN transition occurs within 150ns of COUT edge, enabling <100µs direction decision time-critical for seamless restart synchronization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar VR sensor interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9927AEE/V+ | Dual operational amplifier architecture (externally set gain) vs. MAX9926UAEE/V+T's fixed-gain differential amplifiers; no DIRN output. | Suitable for applications requiring programmable gain (e.g., multi-sensor calibration) but not directional sensing. | Select MAX9927AEE/V+ when gain flexibility outweighs need for hardware DIRN; requires external resistors for gain setting. |
| TLE4961-2M | Single-channel VR interface with integrated Hall-effect backup; lacks dual-channel or DIRN functionality; different pinout and biasing scheme. | Used in cost-sensitive single-sensor applications where redundancy (Hall + VR) is required, not quadrature decoding. | Choose TLE4961-2M only for single-point sensing with fail-safe capability; not a functional replacement for MAX9926UAEE/V+T's dual-channel DIRN operation. |
Compared with MAX9927AEE/V+, MAX9926UAEE/V+T provides hardware-level direction detection and eliminates gain-setting components, while TLE4961-2M trades dual-channel capability for integrated redundancy-making MAX9926UAEE/V+T uniquely suited for high-accuracy, dual-sensor engine timing systems.
Availability
MAX9926UAEE/V+T is available at Aetrix Electronics and suitable for automotive engine control units, transmission control modules, and hybrid powertrain controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX9926UAEE/V+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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX9924–MAX9927 family was engineered specifically for robust variable reluctance sensor interfacing in harsh automotive environments, emphasizing noise immunity, adaptive signal conditioning, and AEC-Q100 compliance from design inception.
FAQ
What is the primary function of the DIRN output on the MAX9926UAEE/V+T?
The DIRN output on the MAX9926UAEE/V+T is an open-drain rotational direction indicator used exclusively with quadrature-connected VR sensors. It asserts high when COUT1 leads COUT2 (indicating clockwise rotation) and low when COUT1 lags COUT2 (counterclockwise), enabling immediate direction detection without microcontroller edge-timing analysis. This feature is intrinsic to the MAX9926UAEE/V+T and not present in MAX9924/MAX9925/MAX9927 variants.
How does the adaptive peak threshold in MAX9926UAEE/V+T improve reliability during cold cranking?
The adaptive peak threshold in MAX9926UAEE/V+T dynamically scales to 33% of the prior-cycle VR signal peak, allowing reliable pulse generation even when input amplitude drops below 20mV during low-RPM cold cranking. Combined with an 85ms watchdog timer that resets to minimum threshold (4–30mV) upon signal loss, it prevents missed tooth events in start-stop systems where battery voltage sag reduces sensor output.
Can MAX9926UAEE/V+T interface with both differential and single-ended VR sensors?
Yes, MAX9926UAEE/V+T supports both differential and legacy single-ended VR sensors. Its dual differential input stages (IN1+/IN1-, IN2+/IN2-) accept either configuration: differential sensors connect across complementary inputs, while single-ended sensors connect between one input and ground (with appropriate DC biasing via BIAS1/BIAS2). This flexibility allows reuse of existing sensor hardware during platform upgrades.
What are the key power supply decoupling requirements for MAX9926UAEE/V+T?
MAX9926UAEE/V+T requires three parallel bypass capacitors on VCC: 10nF (placed closest to VCC/GND pins), 0.1µF, and 1µF ceramic types, all with low ESR/ESL. This multi-capacitor network suppresses noise from the internal charge pump and high-frequency EMI. Traces to VCC and GND must be wide (preferably planes) and avoid vias in the high-frequency current path to maintain impedance below 1Ω up to 100MHz.
How does the zero-crossing detection in MAX9926UAEE/V+T differ from peak-detection methods in engine timing?
Zero-crossing detection in MAX9926UAEE/V+T aligns output pulses to the exact center of gear teeth-where the VR sensor signal crosses zero-providing superior angular accuracy versus peak detection, which shifts with amplitude variations. With 50ns propagation delay and <20ns jitter, it delivers sub-degree crank angle resolution at high RPM, directly supporting tight spark timing windows in modern GDI engines.
MAX9926UAEE/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Sensor Interface
- Input Type:
- Differential
- Output Type:
- Logic
- Current - Supply:
- 10 mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX9926UAEE/V+T FAQ
1.How can I place an order for MAX9926UAEE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9926UAEE/V+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 MAX9926UAEE/V+T reliable?
The price and inventory of MAX9926UAEE/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9926UAEE/V+T is usually 5 days.
3.What payment methods are accepted for MAX9926UAEE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9926UAEE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9926UAEE/V+T?
MAX9926UAEE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9926UAEE/V+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 MAX9926UAEE/V+T?
For technical support, including MAX9926UAEE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9926UAEE/V+T requirements.
6.How does Aetrix verify that MAX9926UAEE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX9926UAEE/V+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 MAX9926UAEE/V+T meets industry standards.
7.What is the process for return or replacement of MAX9926UAEE/V+T?
All MAX9926UAEE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9926UAEE/V+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 MAX9926UAEE/V+T part is unused and in its original packaging.
Return procedure for MAX9926UAEE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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