The MAX7322 is a member of the MAX7322 family of devices, a 2-wire serial-interfaced peripheral with four push-pull outputs and four input ports with selectable internal pullups. Input ports are overvoltage protected to +6V and feature transition detection with interrupt output. The four input ports are continuously monitored for state changes (transition detection). The interrupt is latched, allowing detection of transient changes. Any combination of inputs can be selected using the interrupt mask to assert the open-drain INT output. When the MAX7322 is subsequently accessed through the serial interface, any pending interrupt is cleared. The four push-pull outputs are rated to sink 20mA, and are capable of driving LEDs. The RST input clears the serial interface, terminating any I2C communication to or from the MAX7322. The MAX7322 uses two address inputs with four-level logic to allow 16 I2C slave addresses. The slave address also sets the power-up default logic state for the four out- put ports, and enables or disables internal 40kΩ pullups for the input ports. The MAX7322 is available in 16-pin QSOP and TQFN packages, and is specified over the -40°C to +125°C automotive temperature range.
The MAX7322 is a general‑purpose I2C port expander that provides four push‑pull output ports (20 mA sink) and four input ports with selectable internal pull‑ups. Input pins are over‑voltage protected to +6 V and feature transition detection with a latched interrupt output. The device uses two address pins (ADO, AD2) to select one of 16 possible I2C slave addresses and to set power‑up default states.
Electrical specifications include a supply voltage range of 1.71 V to 5.5 V, an operating temperature range of –40 °C to +125 °C, a 400 kHz I2C clock frequency, and ultra‑low standby current (typical 0.6 pA). Pin functions are defined for QSOP‑16 and TQFN‑16 packages, with dedicated pins for reset, interrupt, SCL, SDA, and power.
| Supply Voltage (V+) | 1.71 V to 5.5 V |
|---|---|
| Push‑Pull Output Current (sink) | 20 mA per output |
| Input Overvoltage Protection | +6 V |
| Operating Temperature Range | –40 °C to +125 °C |
| I2C Serial Clock Frequency | 400 kHz |
| Standby Current (typical) | 0.6 pA |
The device provides four push‑pull output ports, each capable of sinking 20 mA.
The I2C serial interface operates up to 400 kHz.
Yes, the four input ports are overvoltage protected to +6 V.