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
DescriptionThe 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).
- 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
- AD0 and AD2 Inputs Select from 16 Slave Addresses
- Low 0.6µA (typ) Standby Current
- -40°C to +125°C
- Cell Phones
- Satellite Radio
|Part Number||Interface||Inputs||Reset Input||Interrupt Output||Over Voltage Protection|
Technical DocumentsApp Note 4634 Adding Edge-Sensitive Transition Detection to GPIO Devices
App Note 4024 SPI/I²C Bus Lines Control Multiple Peripherals
App Note 3814 Port Expanders for Flip-Cell Phones Save Cost and Space
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
|App Note||4634||Adding Edge-Sensitive Transition Detection to GPIO Devices|
|App Note||4024||SPI/I²C Bus Lines Control Multiple Peripherals|
|App Note||3814||Port Expanders for Flip-Cell Phones Save Cost and Space|