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Analog Devices Inc./Maxim Integrated MAX22199ATJ+T
- Part No.:
- MAX22199ATJ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX22199ATJ+T.pdf
- Description:
- LOW COST OCTAL INDUSTRIAL DIGITA
- Quantity:
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Product details
Overview
MAX22199ATJ+T from Maxim Integrated is an IEC 61131-2 compliant octal industrial digital input IC that translates eight 24V current-sinking field inputs into a serialized SPI-compatible output for 3V–5.5V logic systems. It supports Type 1/Type 3 (8-channel) or Type 2 (4-channel) configurations, features programmable per-channel glitch filtering (50µs–20ms), integrated 3.3V LDO (25mA), and operates across –40°C to +125°C ambient. It is used in PLC I/O modules for reliable sensor signal acquisition in harsh factory environments.
For engineers reviewing the MAX22199ATJ+T datasheet, MAX22199ATJ+T pinout, MAX22199ATJ+T application, or MAX22199ATJ+T equivalent, key selection criteria include IEC 61131-2 compliance, field-side supply range (7V–65V), configurable input current (0.5–3.4mA), SPI daisy-chain capability, and ±40V input protection - all validated for industrial control system integration.
Technical Context
The MAX22199ATJ+T implements a dual-domain architecture: field-side inputs (IN1–IN8) with precision current-limiting and programmable digital filters feed into a serializer synchronized via LATCH or CS; logic-side SPI (SCLK/SDI/SDO/CS) operates at 3.3V or 5V levels controlled by VL. Its internal 3.3V LDO powers both the IC and external loads when powered from VDD24.
Each input channel includes independent configuration of debounce delay (8 selectable values), filter bypass, and current-source enable/disable. Diagnostics include thermal shutdown (165°C), VDD24 under/mising voltage alarms, CRC error detection, and fault interrupt generation via open-drain FAULT pin - all register-accessible and configurable via SPI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Count & Type | 8-channel current-sinking digital input; supports IEC 61131-2 Type 1/3 (8-ch) or Type 2 (4-ch via dual-channel pairing) |
| Field Supply Range | VDD24 = 7V to 65V - enables direct connection to industrial 24V rails without external regulation |
| Logic Interface | SPI-compatible 4-wire interface (CS/SCLK/SDI/SDO) with 10MHz max clock; VL pin selects 3.3V or 5V logic level |
| Input Current Accuracy | ±11% input-current limiting (e.g., 2.35mA typ @ RREFDI = 7.5kΩ) ensures repeatable IEC trip-point compliance |
| Filter Programmability | Per-channel digital glitch filter with 8 selectable delays (50µs to 20ms) - eliminates need for external RC networks |
| Operating Temp | –40°C to +125°C ambient - qualified for extended deployment in control cabinets and motor drive enclosures |
| ESD/Surge | ±8kV contact / ±15kV air-gap ESD (IEC 61000-4-2); ±2kV surge (IEC 61000-4-5) on INx pins with ≥1kΩ series resistor |
Pinout & Package
MAX22199ATJ+T uses a 32-pin 5mm × 5mm TQFN package with exposed thermal pad (EP). Pin functions are validated per Maxim's official pin description table and functional block diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD24 (Pin 30) | Field-side power input | Accepts 7V–65V supply; powers internal LDO and input circuitry; requires 0.1µF + 1µF bypass |
| VDD (Pin 31) | LDO output / logic-side supply input | Provides regulated 3.3V (25mA) when powered from VDD24; or accepts 3.0V–5.5V external supply if VDD24 unconnected |
| VL (Pin 16) | Logic interface voltage reference | Sets SPI I/O voltage level (3.0V–5.5V); determines VIH/VIL thresholds and SDO VOH/VOL |
| CS (Pin 9) | SPI chip-select & data latch trigger | Active-low; falling edge freezes input sampling and enables SPI read; high-Z SDO when asserted high |
| LATCH (Pin 12) | Multi-device synchronization input | Falling edge freezes input sampling across multiple MAX22199ATJ+T devices - critical for deterministic PLC scan timing |
| FAULT (Pin 14) | Open-drain fault indicator | Active-low; asserts on thermal shutdown, VDD24 UV/VM, CRC error, or SPI fault - configurable to generate interrupt |
| READY (Pin 15) | Power-good status output | Open-drain; goes low when VDD is valid and device is ready for SPI communication |
| IN1–IN8 (Pins 1,3,5,7,18,20,22,24) | Current-sinking field inputs | Accept 24V sensors; each has ±40V absolute max rating and programmable current limit (0.5–3.4mA) |
| LED1–LED8 (Pins 2,4,6,8,17,19,21,23) | Energyless LED drivers | Divert input current to drive indicator LEDs without increasing total power dissipation - connect LED to GND |
| REFDI (Pin 27) | Reference resistor connection | Connects to GND via 7.5kΩ (Type 1/3) or 5.2kΩ (Type 2) resistor to set precise input current threshold |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61131-2 Compliance | Validated for Type 1, Type 2 (dual-channel), and Type 3 digital inputs - meets voltage/current trip-point and noise immunity requirements |
| Programmable Per-Channel Filtering | Independent 8-step digital filter (50µs–20ms) per INx pin - replaces analog RC networks and enables adaptive noise rejection |
| Integrated Field-Side LDO | 3.3V regulator delivering up to 25mA - powers MCU peripherals or isolated logic without secondary supply |
| Daisy-Chain SPI Support | M0/M1 pins configure cascaded topology - reduces host GPIO count and simplifies multi-module I/O expansion |
| Comprehensive Diagnostics | Register-accessible flags for thermal shutdown, VDD24 UV/VM, CRC errors, and SPI faults - enables predictive maintenance |
| Robust Industrial Protection | ±40V input tolerance, ±8kV contact ESD, ±2kV surge (IEC 61000-4-5) - survives real-world factory transients |
Applications
| Programmable Logic Controllers (PLCs) | Distributed Control Systems (DCS) |
|---|---|
|
Use Scenario: Modular I/O base units acquiring discrete sensor signals (e.g., limit switches, proximity sensors) in cabinet-mounted PLC racks. IC Role / Device Role / Timing Role: Octal digital input front-end converting 24V sinking signals to SPI for microcontroller polling; LATCH enables synchronized sampling across multiple modules. Use Value: Eliminates discrete optocouplers and RC filters, reducing BOM count by >60% and PCB area by 40% vs. legacy designs. |
Use Scenario: Remote I/O nodes in oil & gas or water treatment plants collecting valve position and pump status over long cable runs. IC Role / Device Role / Timing Role: Field-side signal conditioner with ±40V input tolerance and programmable glitch filtering - rejects EMI induced on 100m+ cables. Use Value: Maintains signal integrity in noisy environments without external surge suppressors or shielded cabling. |
| Motor Control Systems | Building Automation |
|
Use Scenario: Safety-rated motor starter panels monitoring emergency stop buttons, overload contacts, and encoder index pulses. IC Role / Device Role / Timing Role: High-reliability input interface with thermal shutdown and CRC-protected SPI - prevents false trips during high-temperature operation. Use Value: Enables SIL2-compliant designs via diagnostic coverage (DC) from integrated fault registers and READY/FAULT signaling. |
Use Scenario: HVAC controllers reading occupancy sensors, damper actuators, and fire alarm inputs in commercial buildings. IC Role / Device Role / Timing Role: Low-power digital input with 0.6mA typical supply current - extends battery life in wireless gateways and reduces heat in sealed enclosures. Use Value: Supports energy-efficient building standards (e.g., ASHRAE 90.1) through minimized standby power and thermal footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar industrial digital input applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX22190ATJ+ | Pin-to-pin compatible; identical pinout, register map, and electrical specs; same 32-pin TQFN package | Targeted for cost-sensitive applications; lacks some advanced diagnostics (e.g., no VDD24 missing-voltage alarm) | Select MAX22190ATJ+ where full MAX22199ATJ+T diagnostic feature set is not required and BOM cost reduction is prioritized |
| TI ISO1211DR | Galvanically isolated 8-channel digital input; requires external isolated power; no integrated LDO or SPI serializer | Used where reinforced isolation (5kVRMS) is mandatory; adds complexity with isolated DC/DC and separate SPI isolator | Choose ISO1211DR only when system-level safety certification (e.g., UL 61800-5-1) demands galvanic isolation between field and logic sides |
Compared with MAX22190ATJ+, the MAX22199ATJ+T adds VDD24 missing-voltage detection and enhanced CRC implementation; versus ISO1211DR, it eliminates isolation components but requires shared ground - making it optimal for non-isolated PLC backplanes and space-constrained DCS nodes.
Availability
MAX22199ATJ+T is available at Aetrix Electronics and suitable for programmable logic controllers, distributed control systems, and motor control applications requiring stable component supply, long-term industrial lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for MAX22199ATJ+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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX22199ATJ+T belongs to Maxim's industrial interface product line, designed specifically to replace optocoupler-based digital input modules with integrated, SPI-enabled, IEC-compliant solutions for next-generation PLCs and automation controllers.
FAQ
What is the maximum field supply voltage supported by the MAX22199ATJ+T?
The MAX22199ATJ+T supports a field-side supply voltage (VDD24) from 7V to 65V. This wide range allows direct connection to standard 24V industrial rails as well as higher-voltage auxiliary supplies, eliminating the need for external regulators. Absolute maximum rating is +70V, but continuous operation above 65V is not recommended per datasheet specifications.
Does the MAX22199ATJ+T require external filtering capacitors on its IN1–IN8 pins?
No, the MAX22199ATJ+T does not require external RC filters on IN1–IN8. Its per-channel digital glitch filter (programmable from 50µs to 20ms) replaces analog filtering. The datasheet explicitly warns against connecting capacitors to IN_ pins, as this degrades noise immunity and violates IEC 61131-2 transient response requirements.
How is the input current limit configured for Type 1/Type 3 operation on the MAX22199ATJ+T?
For Type 1/Type 3 operation, the MAX22199ATJ+T uses a 7.5kΩ resistor connected between REFDI (Pin 27) and GND. This sets the nominal input current limit to 2.35mA, satisfying IEC 61131-2 voltage and current thresholds. The relationship is defined by RREFDI = 17.63V ÷ IINLIM, enabling precise calibration across temperature and supply variations.
Can the MAX22199ATJ+T operate without an external microcontroller?
No, the MAX22199ATJ+T is not autonomous - it requires an external SPI master (e.g., ARM Cortex-M MCU) to read input states, configure registers, and clear faults. It has no internal processor or firmware; its role is strictly signal conditioning and serialization. The READY and FAULT pins provide status but do not enable standalone operation.
What is the purpose of the LATCH pin on the MAX22199ATJ+T?
The LATCH pin on the MAX22199ATJ+T synchronizes input sampling across multiple devices. When asserted low, it freezes the state of all eight inputs simultaneously - ensuring deterministic, phase-aligned acquisition in multi-module PLC backplanes. This avoids skew between channels when daisy-chaining several MAX22199ATJ+T units on one SPI bus.
MAX22199ATJ+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, Motor Controller
- Interface:
- SPI
- Voltage - Supply:
- 3V ~ 5.5V
- Supplier Device Package:
- 32-TQFN (5x5)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
MAX22199ATJ+T FAQ
1.How can I place an order for MAX22199ATJ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22199ATJ+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 MAX22199ATJ+T reliable?
The price and inventory of MAX22199ATJ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22199ATJ+T is usually 5 days.
3.What payment methods are accepted for MAX22199ATJ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22199ATJ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22199ATJ+T?
MAX22199ATJ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22199ATJ+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 MAX22199ATJ+T?
For technical support, including MAX22199ATJ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22199ATJ+T requirements.
6.How does Aetrix verify that MAX22199ATJ+T is sourced from the original manufacturer or authorized distributors?
All MAX22199ATJ+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 MAX22199ATJ+T meets industry standards.
7.What is the process for return or replacement of MAX22199ATJ+T?
All MAX22199ATJ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX22199ATJ+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 MAX22199ATJ+T part is unused and in its original packaging.
Return procedure for MAX22199ATJ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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