ET6408Y | ETEK Microelectronics

I/O Expander, ET6408Y, ETEK Microelectronics

The ET6408 is an I²C-bus to 8-bit parallel port expander with bidirectional voltage-level translation (1.8V-5.5V), ultra-low standby current, and high-drive GPIOs for flexible I/O expansion in mixed-voltage systems. The ET6408 has two supply voltages: VDDI and VDDP. VDDI provides the power supply voltage for the master terminal (MCU) interface, and VDDP provides the power supply voltage for the internal core circuit and 8-bit I/O port. The ET6408 has four main sets of registers: configuration register, input register, output register, and polarity reversal register. During power-on, all I/O ports are configured as inputs by default. By configuring the registers, the system can determine the input/output status of each I/O port. Each input or output data is stored in the corresponding input or output register. The polarity of the input register can be reversed by configuring the polarity reversal register to save external logic gates.

In addition, the ET6408 has eight other registers: adjust output drive strength register, input latch register, Pull-up/Pull-down enable register, Pull-up/Pull-down type choice register, interrupt shielding register, interrupt status register, and output state control register. By configuring the registers, you can set the corresponding states. When a timeout or error occurs, the host can RESET the ET6408 by applying a low level on the RESET port. During power-on reset, all registers are restored to their default states, and the I²C/SM bus state machine is initialized.

Features

• Active LOW reset input
• Open-drain active LOW interrupt output
• Input/Output Configuration register
• Polarity Inversion register
• Internal power-on reset
• Output has Push-pull and Open-drain modes
• Pull-up resistors and Pull-down resistors can be configured
• Noise filter on SCL/SDA inputs