MAX14906 Quad-Channel Digital I/O Device

Analog Devices' MAX14906 is a high-speed, four-channel IEC 61131-2-compliant industrial digital-output/digital-input device that can be configured on a per-channel basis as a high-side switch, push-pull driver, or a Type 1-, Type 2-, or Type 3-compliant digital input. The MAX14906 is available in a compact 48-pin 7 mm x 7 mm QFN package, is specified for operation with a supply voltage up to 40 V, and is tolerant to 65 V. Each channel can be supplied with an individual supply voltage that can be set at different levels.

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

The SPI interface has a built-in chip-addressing decoder that allows communication with multiple MAX14906 devices utilizing a shared SPI with a common chip select (CS). The SPI interface provides flexibility for global and per-channel configuration and diagnostics, including supply overvoltage and undervoltage detection, wire-break or openwire 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 indicate per-channel fault, status, and supply undervoltage conditions. Internal active clamps allow for fast turnoff of inductive loads. Integrated line-to-ground and line-to-line surge protection only requires a TVS on V_DD.