I²C Port Expander with Eight Inputs and Maskable Transition Detection
Best-Suited Port Expander to Monitor Transient Changes at the Inputs for Data-Sensitive Applications with Wide Operating Voltage and Temperature Ranges
The MAX7319 2-wire serial-interfaced peripheral features eight input ports with selectable internal pullups, overvoltage protection to +6V, and transition detection with interrupt output.
All input ports are continuously monitored for state changes (transition detection). Transitions are latched, allowing detection of transient changes. Any combination of inputs can be selected using the interrupt mask to assert the active-low INT output. When the MAX7319 is subsequently accessed through the serial interface, any pending interrupt is cleared.
The +5.5V tolerant active-low RST input clears the serial interface, terminating any I²C communication to or from the MAX7319.
The MAX7319 uses two address inputs with four-level logic to allow 16 I²C slave addresses. The slave address also enables or disables internal 40kΩ pullups in groups of four ports.
The MAX7319 supports hot insertion. All eight input ports, the serial interface SDA, SCL, AD0, AD2, active-low INT, and active-low RST remain high impedance in power-down (V+ = 0) with up to +6V asserted on them.
The MAX7319 is one device in a family of pin-compatible port expanders with a choice of input ports, open-drain I/O ports, and push-pull output ports.
The MAX7319 is available in 16-pin QSOP and 16-pin TQFN packages, and is specified over the automotive temperature range (-40°C to +125°C).
Key Features
Applications/Uses
400kHz, +5.5V-Tolerant I²C Serial Interface
+1.71V to +5.5V Operating Voltage
Eight Input Ports with Maskable, Latching Transition Detection
Input Ports are Overvoltage Protected to +6V
Transient Changes are Latched, Allowing Detection Between Read Operations
Active-Low INT Output Alerts Change on Any Selection of Inputs
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