The MAX7324 2-wire serial-interfaced peripheral features
16 I/O ports that are divided into eight push-pull
outputs and eight inputs. Each input features selectable
internal pullups, overvoltage protection to +6V, and
transition detection with an interrupt output.
All 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 active-low INT output. When the MAX7324 is subsequently
accessed through the serial interface, any
pending interrupt is cleared.
The push-pull outputs are rated to sink 20mA and are
capable of driving LEDs. The active-low RST input clears the serial
interface, terminating any I²C communication to or from
the MAX7324.
The MAX7324 uses two address inputs with four-level
logic to allow 16 I²C slave addresses. The slave
address also enables or disables internal 40k pullups in groups of four ports.
The MAX7324 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 (see Table 1 in the full data sheet).
The MAX7324 is available in 24-pin QSOP and TQFN
packages, and is specified over the -40°C to +125°C
automotive temperature range.
Key Features
Applications/Uses
400kHz, +6V-Tolerant I²C Serial Interface
+1.71V to +5.5V Operating Voltage
Eight Push-Pull Outputs
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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pullups in groups of four ports.