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The PI4IOESV6416Q is a 16-bit general-purpose I/O expander that provides remote I/O expansion for most microcontroller families via the l2C-bus interface.
It provides a simple solution when additional I/Os are needed while keeping interconnections to a minimum, for example, in battery-powered mobile applications for interfacing to sensors, push buttons, keypad, etc.
It can operate from 1.65 V to 5.5 V on the GPIO-port side and 1.65V to 5.5V on the SDA/SCL side. This allows the PI4IOE5V6416Q to interface with next generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power.
The bidirectional voltage-level translation in the PI4IOE5V6416Q is provided through VDD (I2C_bus). VDD (I2C_bus) should be connected to the VDD of the external SCL/SDA lines. The voltage level on the GPIO-port of the PI4IOE5V6416Q is determined by VDD(P).
At power on, the I/Os are configured as inputs; however, the system master can enable the I/Os as either inputs or outputs by writing to the I/O direction bits. The data for each input or output is kept in the corresponding Input or Output register. All registers can be read by the system master.
PI4IOESV6416Q has open-drain interrupt (INT) output pin that goes LOW when the input state of a GPIO-port changes from the input-state default register value. The device also has an interrupt masking feature by which the user can mask the interrupt from an individual GPIO port.
Operation power supply voltage from 1.65V to 5.5V
Allows bidirectional voltage-level translation and GPIO expansion between:
1.8/2.5/3.3/5V SCL/SDA and 1.8/2.5/3.3/5V Port
Low standby current consumption:
1.5 µA typical at 5 V VDD
1 µA typical at 3.3 V VDD
400kHz I2C-bus interface
Compliant with the I2C-bus Fast and Standard modes
Programmable Push-pull/Open-drain output stages
Programmable output drive strength and pull-up/down resistor