Description

The MAX7322 2-wire serial-interfaced peripheral featuresfour push-pull outputs and four input ports with selectableinternal pullups. Input ports are overvoltage protected to+6V and feature transition detection with interrupt output.The four input ports are continuously monitored for statechanges (transition detection). The interrupt is latched,allowing detection of transient changes. Any combinationof inputs can be selected using the interrupt mask toassert the open-drain active-low INT output. When the MAX7322 issubsequently accessed through the serial interface, anypending interrupt is cleared.The four push-pull outputs are rated to sink 20mA, andare capable of driving LEDs.The active-low RST input clears the serial interface, terminating anyI²C communication to or from the MAX7322.The MAX7322 uses two address inputs with four-levellogic to allow 16 I²C slave addresses. The slave addressalso sets the power-up default logic state for the four outputports, and enables or disables internal 40kΩ pullups for the input ports.The MAX7322 is one device in a family of pin-compatibleport expanders with a choice of input ports, open-drainI/O ports, and push-pull output ports (see Table 1 in the full data sheet).The MAX7322 is available in 16-pin QSOP and TQFNpackages, and is specified over the -40°C to +125°Cautomotive temperature range.ApplicationsCell PhonesNotebooksSAN/NASSatellite RadioServers