Description

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The MAX14906 is an IEC 61131-2 compliant, high-speed, four-channel industrial digital output, digital input device that can be configured on a per-channel basis as a high-side (HS) switch, push-pull (PP) driver, or a Type 1 and 3, or Type 2 digital input. The MAX14906 is specified for operation with a supply voltage up to 40V and is tolerant to 65V.

The high-side switch current limiting is settable from 130mA to 1.2A with the option of 2x load inrush current. The high-side driver on-resistance is 120mΩ (typ) at 25°C ambient temperature. Optional push-pull operation allows high speed driving of cables and fast discharge of load capacitance. For digital input operation, current sinks for 2.3mA (Type 1 and 3) or 7mA (Type 2) are provided.

The SPI interface has a built-in chip addressing decoder, allowing communication with multiple MAX14906 devices utilizing a shared SPI with a common chip select active-low CS. The SPI interface provides flexibility for global and per-channel configuration and diagnostics, including supply overvoltage and undervoltage detection, wire-break or open-wire detection, thermal overload and current limit reporting, and more. For high-speed operation, the digital input and output states can be monitored and changed directly using pins for increased system speed and throughput.

Open-wire detection monitors open-wire/open-load conditions with switches in the off state. LED drivers provide indication of per-channel fault, status, and supply undervoltage conditions. Internal active clamps allow for fast turn-off of inductive loads. Integrated line-to-ground and line-to-line surge protection only requires a TVS on V_DD.

The MAX14906 is available in a compact 48-pin 7mm x 7mm QFN package.

Key Features

• Per-Channel Configurability Enables Wide Range of Applications 
  • Digital Output: High-Side (HS) Switch or Push-Pull (PP) Driver
  • Digital Input: Software Selectable Type 1 and 3, or Type 2
  • Current Limit Settable from 130mA to 1.2A
  • Serial (SPI) or Direct Operation Using Pins
  • Independent Channel Powering
• Fault Tolerant with Built-In Diagnostics
  • Per-Channel Diagnostics
  • Integrated Voltage Supply Monitoring and Short-to-V_DD Detection
  • Open-Wire/Open-Load Detection 
  • Thermal Shutdown Protection
  • Watchdog Timer
  • 5-Bit CRC Code Generation and Checking for SPI Error Detection
• High Integration Reduces BOM Count and PCB Space 
  • Integrated LDO Compatible with 5V Logic Devices
  • Internal Active Clamps for Fast Inductive Load Turn-Off 
  • 0.6μs (typ) DO and 1μs (typ) DI Propagation Delays
  • Addressable SPI
  • 7mm x 7mm TQFN Package
• Reduced Power and Heat Dissipation
  • Low R_DSON for High-Side Switches, 120mΩ (typ)
  • Accurate Output Current Limiting
  • Accurate Input Current Sinks, Type 1 and 3, or Type 2
• Robust Design
  • 10V to 40V Operating Supply Range, 65V Tolerant
  • SafeDemag^TM Allows Fast Turn-Off of Unlimited Inductance
  • ±16kV Air-Gap ESD and ±8kV Contact ESD
  • ±1kV Surge Tolerant Using TVS Protection on V_DD to GND
  • -40°C to +125°C Operating Temperature

Applications/Uses

• Industrial Digital Output and Input Module
• Configurable Digital Input/Output
• Motor Control
• PLC Systems
• Distributed Control Systems (DCS)