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ET6408
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General Description
The ET6408 is an 8-bit universal I/O port expansion IC. It provides up to 8 I/O port expansion functions for MCU through I2C-bus /SM bus interface. It also has level conversion function, which makes it flexible to be used in multi-voltage mixed signal communication environment.
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 input by default.By configuring 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.
Specification
Sample
Features
- I2C-bus to parallel port expander
- Operating power supply voltage range of 1.65 V to 5.5 V
- Allows bidirectional voltage-level translation and GPIO expansion between
- Low standby current consumption
- Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
- The minimum SDA/SCL input high level less than 1.2V
- Active LOW reset input ( RESET )
- Open-drain active LOW interrupt output ( INT )
- Input/Output Configuration register
- 400 kHz Fast-mode I2C-bus
- 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
- Outputs with 25 mA drive maximum capability for directly driving LEDs
- Latch-up performance exceeds 100 mA
- ESD protection exceeds
